From 6a52cae98c289b9850fe78431ac948b7db13bb9e Mon Sep 17 00:00:00 2001
From: Pranav K <prkrishn@hotmail.com>
Date: Fri, 11 Jun 2021 07:45:47 -0700
Subject: [PATCH] Provide a tooling gesture that suggests values for required
 component parameters are not specified. (dotnet/aspnetcore#33384)

* Provide a tooling gesture that suggests values for required component parameters are not specified.

Fixes dotnet/aspnetcore#11815

Commit migrated from dotnet/aspnetcore@e02723975a97
---
 .../src/BoundAttributeDescriptor.cs           |   4 +-
 .../src/BoundAttributeDescriptorBuilder.cs    |   4 +-
 .../src/Components/ComponentLoweringPass.cs   |  47 +++-
 .../DefaultBoundAttributeDescriptorBuilder.cs |   5 +-
 .../src/RazorDiagnosticFactory.cs             |  12 +
 .../src/Resources.resx                        |   7 +-
 .../src/TagHelperDescriptor.cs                |  26 ++
 .../ComponentCodeGenerationTestBase.cs        | 259 ++++++++++++++++++
 .../TestComponent.codegen.cs                  |  37 +++
 .../TestComponent.diagnostics.txt             |   1 +
 .../TestComponent.ir.txt                      |  19 ++
 .../TestComponent.codegen.cs                  |  37 +++
 .../TestComponent.ir.txt                      |  27 ++
 .../TestComponent.codegen.cs                  |  37 +++
 .../TestComponent.ir.txt                      |  22 ++
 .../TestComponent.codegen.cs                  |  37 +++
 .../TestComponent.ir.txt                      |  27 ++
 .../TestComponent.codegen.cs                  |  37 +++
 .../TestComponent.diagnostics.txt             |   1 +
 .../TestComponent.ir.txt                      |  19 ++
 .../TestComponent.codegen.cs                  |  37 +++
 .../TestComponent.ir.txt                      |  23 ++
 .../TestComponent.codegen.cs                  |  37 +++
 .../TestComponent.diagnostics.txt             |   1 +
 .../TestComponent.ir.txt                      |  19 ++
 .../TestComponent.codegen.cs                  |  38 +++
 .../TestComponent.ir.txt                      |  22 ++
 .../TestComponent.codegen.cs                  |  46 ++++
 .../TestComponent.ir.txt                      |  21 ++
 .../TestComponent.mappings.txt                |   5 +
 .../TestComponent.codegen.cs                  |  22 ++
 .../TestComponent.diagnostics.txt             |   1 +
 .../TestComponent.ir.txt                      |  10 +
 .../TestComponent.codegen.cs                  |  26 ++
 .../TestComponent.ir.txt                      |  12 +
 .../TestComponent.codegen.cs                  |  26 ++
 .../TestComponent.ir.txt                      |  13 +
 .../TestComponent.codegen.cs                  |  26 ++
 .../TestComponent.ir.txt                      |  12 +
 .../TestComponent.codegen.cs                  |  24 ++
 .../TestComponent.ir.txt                      |  16 ++
 .../TestComponent.codegen.cs                  |  22 ++
 .../TestComponent.ir.txt                      |  10 +
 .../TestComponent.codegen.cs                  |  23 ++
 .../TestComponent.diagnostics.txt             |   1 +
 .../TestComponent.ir.txt                      |  13 +
 .../TestComponent.codegen.cs                  |  23 ++
 .../TestComponent.diagnostics.txt             |   2 +
 .../TestComponent.ir.txt                      |  13 +
 .../TestComponent.codegen.cs                  |  22 ++
 .../TestComponent.diagnostics.txt             |   1 +
 .../TestComponent.ir.txt                      |  10 +
 .../TestComponent.codegen.cs                  |  26 ++
 .../TestComponent.ir.txt                      |  12 +
 .../TestComponent.codegen.cs                  |  22 ++
 .../TestComponent.diagnostics.txt             |   1 +
 .../TestComponent.ir.txt                      |  10 +
 .../TestComponent.codegen.cs                  |  23 ++
 .../TestComponent.ir.txt                      |  13 +
 .../TestComponent.codegen.cs                  |  31 +++
 .../TestComponent.ir.txt                      |  12 +
 .../ComponentTagHelperDescriptorProvider.cs   |   1 +
 ...omponentTagHelperDescriptorProviderTest.cs |  49 ++++
 ...ft.AspNetCore.Components.netstandard2.0.cs |   7 +
 64 files changed, 1441 insertions(+), 8 deletions(-)
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.diagnostics.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.diagnostics.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.diagnostics.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.mappings.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.diagnostics.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_AllValuesSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_AllValuesSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_NoValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_NoValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.diagnostics.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.diagnostics.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.diagnostics.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.diagnostics.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.ir.txt
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.codegen.cs
 create mode 100644 src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.ir.txt

diff --git a/src/Microsoft.AspNetCore.Razor.Language/src/BoundAttributeDescriptor.cs b/src/Microsoft.AspNetCore.Razor.Language/src/BoundAttributeDescriptor.cs
index ecfd96105..6a11b3aba 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/src/BoundAttributeDescriptor.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/src/BoundAttributeDescriptor.cs
@@ -29,6 +29,8 @@ protected BoundAttributeDescriptor(string kind)
 
         public bool IsBooleanProperty { get; protected set; }
 
+        internal bool IsEditorRequired { get; set; }
+
         public string Name { get; protected set; }
 
         public string IndexerNamePrefix { get; protected set; }
@@ -81,4 +83,4 @@ public override int GetHashCode()
             return BoundAttributeDescriptorComparer.Default.GetHashCode(this);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Microsoft.AspNetCore.Razor.Language/src/BoundAttributeDescriptorBuilder.cs b/src/Microsoft.AspNetCore.Razor.Language/src/BoundAttributeDescriptorBuilder.cs
index b6fb01d7a..051f2655d 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/src/BoundAttributeDescriptorBuilder.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/src/BoundAttributeDescriptorBuilder.cs
@@ -1,4 +1,4 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
@@ -28,6 +28,8 @@ public abstract class BoundAttributeDescriptorBuilder
 
         public abstract RazorDiagnosticCollection Diagnostics { get; }
 
+        internal bool IsEditorRequired { get; set; }
+
         public virtual IReadOnlyList<BoundAttributeParameterDescriptorBuilder> BoundAttributeParameters { get; }
 
         public virtual void BindAttributeParameter(Action<BoundAttributeParameterDescriptorBuilder> configure)
diff --git a/src/Microsoft.AspNetCore.Razor.Language/src/Components/ComponentLoweringPass.cs b/src/Microsoft.AspNetCore.Razor.Language/src/Components/ComponentLoweringPass.cs
index 3a7e3c748..fa0c73783 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/src/Components/ComponentLoweringPass.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/src/Components/ComponentLoweringPass.cs
@@ -67,7 +67,7 @@ protected override void ExecuteCore(RazorCodeDocument codeDocument, DocumentInte
             }
         }
 
-        private ComponentIntermediateNode RewriteAsComponent(TagHelperIntermediateNode node, TagHelperDescriptor tagHelper)
+        private static ComponentIntermediateNode RewriteAsComponent(TagHelperIntermediateNode node, TagHelperDescriptor tagHelper)
         {
             var component = new ComponentIntermediateNode()
             {
@@ -89,13 +89,54 @@ private ComponentIntermediateNode RewriteAsComponent(TagHelperIntermediateNode n
             // because we see the nodes in the wrong order.
             foreach (var childContent in component.ChildContents)
             {
-                childContent.ParameterName = childContent.ParameterName ?? component.ChildContentParameterName ?? ComponentMetadata.ChildContent.DefaultParameterName;
+                childContent.ParameterName ??= component.ChildContentParameterName ?? ComponentMetadata.ChildContent.DefaultParameterName;
             }
 
+            ValidateRequiredAttributes(node, tagHelper, component);
+
             return component;
         }
 
-        private MarkupElementIntermediateNode RewriteAsElement(TagHelperIntermediateNode node)
+        private static void ValidateRequiredAttributes(TagHelperIntermediateNode node, TagHelperDescriptor tagHelper, ComponentIntermediateNode intermediateNode)
+        {
+            if (intermediateNode.Children.Any(c => c is TagHelperDirectiveAttributeIntermediateNode node && (node.TagHelper?.IsSplatTagHelper() ?? false)))
+            {
+                // If there are any splat attributes, assume the user may have provided all values.
+                // This pass runs earlier than ComponentSplatLoweringPass, so we cannot rely on the presence of SplatIntermediateNode to make this check.
+                return;
+            }
+
+            foreach (var requiredAttribute in tagHelper.EditorRequiredAttributes)
+            {
+                if (!IsPresentAsAttribute(requiredAttribute.Name, intermediateNode))
+                {
+                    intermediateNode.Diagnostics.Add(
+                      RazorDiagnosticFactory.CreateComponent_EditorRequiredParameterNotSpecified(
+                          node.Source ?? SourceSpan.Undefined,
+                          intermediateNode.TagName,
+                          requiredAttribute.Name));
+                }
+            }
+
+            static bool IsPresentAsAttribute(string attributeName, ComponentIntermediateNode intermediateNode)
+            {
+                foreach (var child in intermediateNode.Children)
+                {
+                    if (child is ComponentAttributeIntermediateNode attributeNode && attributeName == attributeNode.AttributeName)
+                    {
+                        return true;
+                    }
+                    else if (child is ComponentChildContentIntermediateNode childContent && attributeName == childContent.AttributeName)
+                    {
+                        return true;
+                    }
+                }
+
+                return false;
+            }
+        }
+
+        private static MarkupElementIntermediateNode RewriteAsElement(TagHelperIntermediateNode node)
         {
             var result = new MarkupElementIntermediateNode()
             {
diff --git a/src/Microsoft.AspNetCore.Razor.Language/src/DefaultBoundAttributeDescriptorBuilder.cs b/src/Microsoft.AspNetCore.Razor.Language/src/DefaultBoundAttributeDescriptorBuilder.cs
index 52f152b33..446bd56b7 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/src/DefaultBoundAttributeDescriptorBuilder.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/src/DefaultBoundAttributeDescriptorBuilder.cs
@@ -125,7 +125,10 @@ public BoundAttributeDescriptor Build()
                 CaseSensitive,
                 parameters,
                 new Dictionary<string, string>(Metadata),
-                diagnostics.ToArray());
+                diagnostics.ToArray())
+            {
+                IsEditorRequired = IsEditorRequired,
+            };
 
             return descriptor;
         }
diff --git a/src/Microsoft.AspNetCore.Razor.Language/src/RazorDiagnosticFactory.cs b/src/Microsoft.AspNetCore.Razor.Language/src/RazorDiagnosticFactory.cs
index d88879c15..2e3c31b4e 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/src/RazorDiagnosticFactory.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/src/RazorDiagnosticFactory.cs
@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Collections.Generic;
 using Microsoft.AspNetCore.Razor.Language.Legacy;
 
 namespace Microsoft.AspNetCore.Razor.Language
@@ -588,6 +589,17 @@ public static RazorDiagnostic CreateTagHelper_InconsistentTagStructure(SourceSpa
             return RazorDiagnostic.Create(TagHelper_InconsistentTagStructure, location, firstDescriptor, secondDescriptor, tagName, nameof(TagMatchingRuleDescriptor.TagStructure));
         }
 
+        internal static readonly RazorDiagnosticDescriptor Component_EditorRequiredParameterNotSpecified =
+            new RazorDiagnosticDescriptor(
+                $"{DiagnosticPrefix}2012",
+                () => Resources.Component_EditorRequiredParameterNotSpecified,
+                RazorDiagnosticSeverity.Warning);
+
+        public static RazorDiagnostic CreateComponent_EditorRequiredParameterNotSpecified(SourceSpan location, string tagName, string parameterName)
+        {
+            return RazorDiagnostic.Create(Component_EditorRequiredParameterNotSpecified, location, tagName, parameterName);
+        }
+
         #endregion
 
         #region TagHelper Errors
diff --git a/src/Microsoft.AspNetCore.Razor.Language/src/Resources.resx b/src/Microsoft.AspNetCore.Razor.Language/src/Resources.resx
index 8fa60e30c..6d541a509 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/src/Resources.resx
+++ b/src/Microsoft.AspNetCore.Razor.Language/src/Resources.resx
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <root>
   <!-- 
     Microsoft ResX Schema 
@@ -571,4 +571,7 @@
   <data name="ParseError_Unexpected_Identifier_At_Position" xml:space="preserve">
     <value>'{0}' is not valid in this position. Valid options are '{1}'</value>
   </data>
-</root>
\ No newline at end of file
+  <data name="Component_EditorRequiredParameterNotSpecified" xml:space="preserve">
+    <value>Component '{0}' expects a value for the parameter '{1}', but a value may not have been provided.</value>
+  </data>
+</root>
diff --git a/src/Microsoft.AspNetCore.Razor.Language/src/TagHelperDescriptor.cs b/src/Microsoft.AspNetCore.Razor.Language/src/TagHelperDescriptor.cs
index 409e71248..a3c264137 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/src/TagHelperDescriptor.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/src/TagHelperDescriptor.cs
@@ -10,6 +10,7 @@ namespace Microsoft.AspNetCore.Razor.Language
     public abstract class TagHelperDescriptor : IEquatable<TagHelperDescriptor>
     {
         private IEnumerable<RazorDiagnostic> _allDiagnostics;
+        private BoundAttributeDescriptor[] _editorRequiredAttributes;
 
         protected TagHelperDescriptor(string kind)
         {
@@ -45,6 +46,14 @@ protected TagHelperDescriptor(string kind)
         internal bool? IsComponentFullyQualifiedNameMatchCache { get; set; }
         internal bool? IsChildContentTagHelperCache { get; set; }
         internal ParsedTypeInformation? ParsedTypeInfo { get; set; }
+        internal BoundAttributeDescriptor[] EditorRequiredAttributes
+        {
+            get
+            {
+                _editorRequiredAttributes ??= GetEditorRequiredAttributes(BoundAttributes);
+                return _editorRequiredAttributes;
+            }
+        }
 
         public bool HasErrors
         {
@@ -96,6 +105,23 @@ public override int GetHashCode()
             return _hashCode.Value;
         }
 
+        private static BoundAttributeDescriptor[] GetEditorRequiredAttributes(IReadOnlyList<BoundAttributeDescriptor> boundAttributeDescriptors)
+        {
+            List<BoundAttributeDescriptor> editorRequiredAttributes = null;
+            var count = boundAttributeDescriptors.Count;
+            for (var i = 0; i < count; i++)
+            {
+                var attribute = boundAttributeDescriptors[i];
+                if (attribute.IsEditorRequired)
+                {
+                    editorRequiredAttributes ??= new();
+                    editorRequiredAttributes.Add(attribute);
+                }
+            }
+
+            return editorRequiredAttributes?.ToArray() ?? Array.Empty<BoundAttributeDescriptor>();
+        }
+
         internal readonly struct ParsedTypeInformation
         {
             public ParsedTypeInformation(bool success, StringSegment @namespace, StringSegment typeName)
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/IntegrationTests/ComponentCodeGenerationTestBase.cs b/src/Microsoft.AspNetCore.Razor.Language/test/IntegrationTests/ComponentCodeGenerationTestBase.cs
index 56e308c0b..411125b5a 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/test/IntegrationTests/ComponentCodeGenerationTestBase.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/IntegrationTests/ComponentCodeGenerationTestBase.cs
@@ -517,6 +517,265 @@ public class ComponentWithNullableRenderFragment : ComponentBase
             CompileToAssembly(generated);
         }
 
+        [Fact]
+        public void Component_WithEditorRequiredParameter_NoValueSpecified()
+        {
+            AdditionalSyntaxTrees.Add(Parse(@"
+using System;
+using Microsoft.AspNetCore.Components;
+namespace Test
+{
+    public class ComponentWithEditorRequiredParameters : ComponentBase
+    {
+        [Parameter]
+        [EditorRequired]
+        public string Property1 { get; set; }
+    }
+}
+"));
+            var generated = CompileToCSharp(@"
+<ComponentWithEditorRequiredParameters />
+");
+            AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+            CompileToAssembly(generated, throwOnFailure: false);
+
+            var diagnostics = Assert.Single(generated.Diagnostics);
+            Assert.Equal(RazorDiagnosticSeverity.Warning, diagnostics.Severity);
+            Assert.Equal("RZ2012", diagnostics.Id);
+        }
+
+        [Fact]
+        public void Component_WithEditorRequiredParameter_ValueSpecified()
+        {
+            AdditionalSyntaxTrees.Add(Parse(@"
+using System;
+using Microsoft.AspNetCore.Components;
+namespace Test
+{
+    public class ComponentWithEditorRequiredParameters : ComponentBase
+    {
+        [Parameter]
+        [EditorRequired]
+        public string Property1 { get; set; }
+    }
+}
+"));
+            var generated = CompileToCSharp(@"
+<ComponentWithEditorRequiredParameters Property1=""Some Value"" />
+");
+            AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+            CompileToAssembly(generated);
+
+            Assert.Empty(generated.Diagnostics);
+        }
+
+        [Fact]
+        public void Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting()
+        {
+            AdditionalSyntaxTrees.Add(Parse(@"
+using System;
+using Microsoft.AspNetCore.Components;
+namespace Test
+{
+    public class ComponentWithEditorRequiredParameters : ComponentBase
+    {
+        [Parameter]
+        [EditorRequired]
+        public string Property1 { get; set; }
+    }
+}
+"));
+            var generated = CompileToCSharp(@"
+<ComponentWithEditorRequiredParameters @attributes=""@(new Dictionary<string, object>())"" />
+");
+            AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+            CompileToAssembly(generated);
+
+            Assert.Empty(generated.Diagnostics);
+        }
+
+        [Fact]
+        public void Component_WithEditorRequiredChildContent_NoValueSpecified()
+        {
+            AdditionalSyntaxTrees.Add(Parse(@"
+using System;
+using Microsoft.AspNetCore.Components;
+namespace Test
+{
+    public class ComponentWithEditorRequiredChildContent : ComponentBase
+    {
+        [Parameter]
+        [EditorRequired]
+        public RenderFragment ChildContent { get; set; }
+    }
+}
+"));
+            var generated = CompileToCSharp(@"
+<ComponentWithEditorRequiredChildContent />
+");
+            AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+            CompileToAssembly(generated, throwOnFailure: false);
+
+            var diagnostics = Assert.Single(generated.Diagnostics);
+            Assert.Equal(RazorDiagnosticSeverity.Warning, diagnostics.Severity);
+            Assert.Equal("RZ2012", diagnostics.Id);
+        }
+
+        [Fact]
+        public void Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName()
+        {
+            AdditionalSyntaxTrees.Add(Parse(@"
+using System;
+using Microsoft.AspNetCore.Components;
+namespace Test
+{
+    public class ComponentWithEditorRequiredChildContent : ComponentBase
+    {
+        [Parameter]
+        [EditorRequired]
+        public RenderFragment ChildContent { get; set; }
+    }
+}
+"));
+            var generated = CompileToCSharp(@"
+<ComponentWithEditorRequiredChildContent>
+    <h1>Hello World</h1>
+</ComponentWithEditorRequiredChildContent>
+
+");
+            AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+            CompileToAssembly(generated);
+
+            Assert.Empty(generated.Diagnostics);
+        }
+
+        [Fact]
+        public void Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName()
+        {
+            AdditionalSyntaxTrees.Add(Parse(@"
+using System;
+using Microsoft.AspNetCore.Components;
+namespace Test
+{
+    public class ComponentWithEditorRequiredChildContent : ComponentBase
+    {
+        [Parameter]
+        [EditorRequired]
+        public RenderFragment ChildContent { get; set; }
+    }
+}
+"));
+            var generated = CompileToCSharp(@"
+<ComponentWithEditorRequiredChildContent>This is some text</ComponentWithEditorRequiredChildContent>
+
+");
+            AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+            CompileToAssembly(generated);
+
+            Assert.Empty(generated.Diagnostics);
+        }
+
+        [Fact]
+        public void Component_WithEditorRequiredChildContent_ValueSpecified()
+        {
+            AdditionalSyntaxTrees.Add(Parse(@"
+using System;
+using Microsoft.AspNetCore.Components;
+namespace Test
+{
+    public class ComponentWithEditorRequiredChildContent : ComponentBase
+    {
+        [Parameter]
+        [EditorRequired]
+        public RenderFragment ChildContent { get; set; }
+    }
+}
+"));
+            var generated = CompileToCSharp(@"
+<ComponentWithEditorRequiredChildContent>
+    <ChildContent>
+        <h1>Hello World</h1>
+    </ChildContent>
+</ComponentWithEditorRequiredChildContent>
+
+");
+            AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+            CompileToAssembly(generated);
+
+            Assert.Empty(generated.Diagnostics);
+        }
+
+        [Fact]
+        public void Component_WithEditorRequiredNamedChildContent_NoValueSpecified()
+        {
+            AdditionalSyntaxTrees.Add(Parse(@"
+using System;
+using Microsoft.AspNetCore.Components;
+namespace Test
+{
+    public class ComponentWithEditorRequiredChildContent : ComponentBase
+    {
+        [Parameter]
+        [EditorRequired]
+        public RenderFragment Found { get; set; }
+
+        [Parameter]
+        public RenderFragment NotFound { get; set; }
+    }
+}
+"));
+            var generated = CompileToCSharp(@"
+<ComponentWithEditorRequiredChildContent>
+</ComponentWithEditorRequiredChildContent>
+
+");
+            AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+            CompileToAssembly(generated, throwOnFailure: false);
+
+            var diagnostics = Assert.Single(generated.Diagnostics);
+            Assert.Equal(RazorDiagnosticSeverity.Warning, diagnostics.Severity);
+            Assert.Equal("RZ2012", diagnostics.Id);
+        }
+
+        [Fact]
+        public void Component_WithEditorRequiredNamedChildContent_ValueSpecified()
+        {
+            AdditionalSyntaxTrees.Add(Parse(@"
+using System;
+using Microsoft.AspNetCore.Components;
+namespace Test
+{
+    public class ComponentWithEditorRequiredChildContent : ComponentBase
+    {
+        [Parameter]
+        [EditorRequired]
+        public RenderFragment Found { get; set; }
+
+        [Parameter]
+        public RenderFragment NotFound { get; set; }
+    }
+}
+"));
+            var generated = CompileToCSharp(@"
+<ComponentWithEditorRequiredChildContent>
+    <Found><h1>Here's Johnny!</h1></Found>
+</ComponentWithEditorRequiredChildContent>
+
+");
+            AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+            CompileToAssembly(generated);
+
+            Assert.Empty(generated.Diagnostics);
+        }
         #endregion
 
         #region Bind
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..a48dac464
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,37 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.AddAttribute(-1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(ComponentWithEditorRequiredChildContent);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.diagnostics.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.diagnostics.txt
new file mode 100644
index 000000000..20d0a0227
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.diagnostics.txt
@@ -0,0 +1 @@
+x:\dir\subdir\Test\TestComponent.cshtml(1,1): Warning RZ2012: Component 'ComponentWithEditorRequiredChildContent' expects a value for the parameter 'ChildContent', but a value may not have been provided.
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..52b25c291
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,19 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [12] ) - System
+        UsingDirective - (18:2,1 [32] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [17] ) - System.Linq
+        UsingDirective - (73:4,1 [28] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [37] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static System.Object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [43] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
+                HtmlContent - (43:0,43 [2] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (43:0,43 [2] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..a48dac464
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,37 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.AddAttribute(-1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(ComponentWithEditorRequiredChildContent);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..5c77e7f32
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,27 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [12] ) - System
+        UsingDirective - (18:2,1 [32] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [17] ) - System.Linq
+        UsingDirective - (73:4,1 [28] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [37] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static System.Object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [156] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
+                    ComponentChildContent - (47:1,4 [65] x:\dir\subdir\Test\TestComponent.cshtml) - ChildContent - context
+                        HtmlContent - (61:1,18 [10] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (61:1,18 [10] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n        
+                        MarkupElement - (71:2,8 [20] x:\dir\subdir\Test\TestComponent.cshtml) - h1
+                            HtmlContent - (75:2,12 [11] x:\dir\subdir\Test\TestComponent.cshtml)
+                                LazyIntermediateToken - (75:2,12 [11] x:\dir\subdir\Test\TestComponent.cshtml) - Html - Hello World
+                        HtmlContent - (91:2,28 [6] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (91:2,28 [6] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n    
+                HtmlContent - (156:4,42 [4] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (156:4,42 [4] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n\n
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.codegen.cs
new file mode 100644
index 000000000..a48dac464
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.codegen.cs
@@ -0,0 +1,37 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.AddAttribute(-1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(ComponentWithEditorRequiredChildContent);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.ir.txt
new file mode 100644
index 000000000..cefa92239
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.ir.txt
@@ -0,0 +1,22 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [12] ) - System
+        UsingDirective - (18:2,1 [32] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [17] ) - System.Linq
+        UsingDirective - (73:4,1 [28] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [37] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static System.Object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [100] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
+                    ComponentChildContent -  - ChildContent - context
+                        HtmlContent - (41:0,41 [17] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (41:0,41 [17] x:\dir\subdir\Test\TestComponent.cshtml) - Html - This is some text
+                HtmlContent - (100:0,100 [4] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (100:0,100 [4] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n\n
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.codegen.cs
new file mode 100644
index 000000000..a48dac464
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.codegen.cs
@@ -0,0 +1,37 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.AddAttribute(-1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(ComponentWithEditorRequiredChildContent);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.ir.txt
new file mode 100644
index 000000000..4a95e0c7f
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.ir.txt
@@ -0,0 +1,27 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [12] ) - System
+        UsingDirective - (18:2,1 [32] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [17] ) - System.Linq
+        UsingDirective - (73:4,1 [28] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [37] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static System.Object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [111] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
+                    ComponentChildContent -  - ChildContent - context
+                        HtmlContent - (41:0,41 [6] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (41:0,41 [6] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n    
+                        MarkupElement - (47:1,4 [20] x:\dir\subdir\Test\TestComponent.cshtml) - h1
+                            HtmlContent - (51:1,8 [11] x:\dir\subdir\Test\TestComponent.cshtml)
+                                LazyIntermediateToken - (51:1,8 [11] x:\dir\subdir\Test\TestComponent.cshtml) - Html - Hello World
+                        HtmlContent - (67:1,24 [2] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (67:1,24 [2] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n
+                HtmlContent - (111:2,42 [4] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (111:2,42 [4] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n\n
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..a48dac464
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,37 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.AddAttribute(-1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(ComponentWithEditorRequiredChildContent);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.diagnostics.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.diagnostics.txt
new file mode 100644
index 000000000..ae41788d3
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.diagnostics.txt
@@ -0,0 +1 @@
+x:\dir\subdir\Test\TestComponent.cshtml(1,1): Warning RZ2012: Component 'ComponentWithEditorRequiredChildContent' expects a value for the parameter 'Found', but a value may not have been provided.
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..ce3eae7ba
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,19 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [12] ) - System
+        UsingDirective - (18:2,1 [32] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [17] ) - System.Linq
+        UsingDirective - (73:4,1 [28] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [37] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static System.Object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [85] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
+                HtmlContent - (85:1,42 [4] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (85:1,42 [4] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n\n
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..cba1ffd9b
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,37 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.AddAttribute(-1, "Found", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(ComponentWithEditorRequiredChildContent);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..1d72e953e
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,23 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [12] ) - System
+        UsingDirective - (18:2,1 [32] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [17] ) - System.Linq
+        UsingDirective - (73:4,1 [28] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [37] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static System.Object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [129] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
+                    ComponentChildContent - (47:1,4 [38] x:\dir\subdir\Test\TestComponent.cshtml) - Found - context
+                        MarkupElement - (54:1,11 [23] x:\dir\subdir\Test\TestComponent.cshtml) - h1
+                            HtmlContent - (58:1,15 [14] x:\dir\subdir\Test\TestComponent.cshtml)
+                                LazyIntermediateToken - (58:1,15 [14] x:\dir\subdir\Test\TestComponent.cshtml) - Html - Here's Johnny!
+                HtmlContent - (129:2,42 [4] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (129:2,42 [4] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n\n
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..f73731f99
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,37 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.AddAttribute(-1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(ComponentWithEditorRequiredParameters);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.diagnostics.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.diagnostics.txt
new file mode 100644
index 000000000..bfd22f324
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.diagnostics.txt
@@ -0,0 +1 @@
+x:\dir\subdir\Test\TestComponent.cshtml(1,1): Warning RZ2012: Component 'ComponentWithEditorRequiredParameters' expects a value for the parameter 'Property1', but a value may not have been provided.
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..b35279a1e
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,19 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [12] ) - System
+        UsingDirective - (18:2,1 [32] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [17] ) - System.Linq
+        UsingDirective - (73:4,1 [28] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [37] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static System.Object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [41] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredParameters
+                HtmlContent - (41:0,41 [2] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (41:0,41 [2] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..0e7c5b81b
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,38 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __o = "";
+            __builder.AddAttribute(-1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(ComponentWithEditorRequiredParameters);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..b9b2f6ce0
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,22 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [12] ) - System
+        UsingDirective - (18:2,1 [32] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [17] ) - System.Linq
+        UsingDirective - (73:4,1 [28] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [37] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static System.Object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [64] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredParameters
+                    ComponentAttribute - (50:0,50 [10] x:\dir\subdir\Test\TestComponent.cshtml) - Property1 - Property1 - AttributeStructure.DoubleQuotes
+                        HtmlContent - (50:0,50 [10] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (50:0,50 [10] x:\dir\subdir\Test\TestComponent.cshtml) - Html - Some Value
+                HtmlContent - (64:0,64 [2] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (64:0,64 [2] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.codegen.cs
new file mode 100644
index 000000000..26dd4369c
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.codegen.cs
@@ -0,0 +1,46 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.AddMultipleAttributes(-1, global::Microsoft.AspNetCore.Components.CompilerServices.RuntimeHelpers.TypeCheck<global::System.Collections.Generic.IEnumerable<global::System.Collections.Generic.KeyValuePair<string, object>>>(
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+                                                      new Dictionary<string, object>()
+
+#line default
+#line hidden
+#nullable disable
+            ));
+            __builder.AddAttribute(-1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(ComponentWithEditorRequiredParameters);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.ir.txt
new file mode 100644
index 000000000..5f2978118
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.ir.txt
@@ -0,0 +1,21 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [12] ) - System
+        UsingDirective - (18:2,1 [32] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [17] ) - System.Linq
+        UsingDirective - (73:4,1 [28] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [37] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static System.Object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [91] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredParameters
+                    Splat - (52:0,52 [35] x:\dir\subdir\Test\TestComponent.cshtml)
+                        LazyIntermediateToken - (54:0,54 [32] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - new Dictionary<string, object>()
+                HtmlContent - (91:0,91 [2] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (91:0,91 [2] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.mappings.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.mappings.txt
new file mode 100644
index 000000000..7cebbba6a
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.mappings.txt
@@ -0,0 +1,5 @@
+Source Location: (54:0,54 [32] x:\dir\subdir\Test\TestComponent.cshtml)
+|new Dictionary<string, object>()|
+Generated Location: (1151:25,54 [32] )
+|new Dictionary<string, object>()|
+
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..14a24d17d
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,22 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithEditorRequiredChildContent>(0);
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.diagnostics.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.diagnostics.txt
new file mode 100644
index 000000000..20d0a0227
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.diagnostics.txt
@@ -0,0 +1 @@
+x:\dir\subdir\Test\TestComponent.cshtml(1,1): Warning RZ2012: Component 'ComponentWithEditorRequiredChildContent' expects a value for the parameter 'ChildContent', but a value may not have been provided.
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..eeaeb0982
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_NoValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,10 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [43] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..7d9872225
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,26 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithEditorRequiredChildContent>(0);
+            __builder.AddAttribute(1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+                __builder2.AddMarkupContent(2, "<h1>Hello World</h1>");
+            }
+            ));
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..ccbcd91f0
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,12 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [156] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
+                    ComponentChildContent - (47:1,4 [65] x:\dir\subdir\Test\TestComponent.cshtml) - ChildContent - context
+                        MarkupBlock -  - <h1>Hello World</h1>
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.codegen.cs
new file mode 100644
index 000000000..d199c4329
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.codegen.cs
@@ -0,0 +1,26 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithEditorRequiredChildContent>(0);
+            __builder.AddAttribute(1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+                __builder2.AddContent(2, "This is some text");
+            }
+            ));
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.ir.txt
new file mode 100644
index 000000000..0e517e230
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecifiedAsText_WithoutName/TestComponent.ir.txt
@@ -0,0 +1,13 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [100] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
+                    ComponentChildContent -  - ChildContent - context
+                        HtmlContent - (41:0,41 [17] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (41:0,41 [17] x:\dir\subdir\Test\TestComponent.cshtml) - Html - This is some text
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.codegen.cs
new file mode 100644
index 000000000..7d9872225
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.codegen.cs
@@ -0,0 +1,26 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithEditorRequiredChildContent>(0);
+            __builder.AddAttribute(1, "ChildContent", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+                __builder2.AddMarkupContent(2, "<h1>Hello World</h1>");
+            }
+            ));
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.ir.txt
new file mode 100644
index 000000000..c27b5fa23
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredChildContent_ValueSpecified_WithoutName/TestComponent.ir.txt
@@ -0,0 +1,12 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [111] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
+                    ComponentChildContent -  - ChildContent - context
+                        MarkupBlock -  - <h1>Hello World</h1>
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_AllValuesSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_AllValuesSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..0226ac529
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_AllValuesSpecified/TestComponent.codegen.cs
@@ -0,0 +1,24 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithRequiredGroup>(0);
+            __builder.AddAttribute(1, "Property1", "SomeValue");
+            __builder.AddAttribute(2, "Property2", "DifferentValue");
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_AllValuesSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_AllValuesSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..8bf4f0139
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_AllValuesSpecified/TestComponent.ir.txt
@@ -0,0 +1,16 @@
+Document -
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase -
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [79] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithRequiredGroup
+                    ComponentAttribute - (39:0,39 [9] x:\dir\subdir\Test\TestComponent.cshtml) - Property1 - Property1 - AttributeStructure.DoubleQuotes
+                        HtmlContent - (39:0,39 [9] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (39:0,39 [9] x:\dir\subdir\Test\TestComponent.cshtml) - Html - SomeValue
+                    ComponentAttribute - (61:0,61 [14] x:\dir\subdir\Test\TestComponent.cshtml) - Property2 - Property2 - AttributeStructure.DoubleQuotes
+                        HtmlContent - (61:0,61 [14] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (61:0,61 [14] x:\dir\subdir\Test\TestComponent.cshtml) - Html - DifferentValue
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_NoValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_NoValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..3f6fa0c91
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_NoValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,22 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithRequiredGroup>(0);
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_NoValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_NoValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..f2e89a110
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_NoValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,10 @@
+Document -
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase -
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [30] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithRequiredGroup
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..f9b099643
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,23 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithRequiredGroup>(0);
+            __builder.AddAttribute(1, "Property1", "SomeValue");
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.diagnostics.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.diagnostics.txt
new file mode 100644
index 000000000..0da7dd5be
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.diagnostics.txt
@@ -0,0 +1 @@
+x:\dir\subdir\Test\TestComponent.cshtml(1,1): Warning RZ2012: Component 'ComponentWithRequiredGroup' expects a value for the parameter 'Property2', but a value may not have been provided.
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..f0708c0f9
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,13 @@
+Document -
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase -
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [52] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithRequiredGroup
+                    ComponentAttribute - (39:0,39 [9] x:\dir\subdir\Test\TestComponent.cshtml) - Property1 - Property1 - AttributeStructure.DoubleQuotes
+                        HtmlContent - (39:0,39 [9] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (39:0,39 [9] x:\dir\subdir\Test\TestComponent.cshtml) - Html - SomeValue
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.codegen.cs
new file mode 100644
index 000000000..f9b099643
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.codegen.cs
@@ -0,0 +1,23 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithRequiredGroup>(0);
+            __builder.AddAttribute(1, "Property1", "SomeValue");
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.diagnostics.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.diagnostics.txt
new file mode 100644
index 000000000..69517a6b6
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.diagnostics.txt
@@ -0,0 +1,2 @@
+x:\dir\subdir\Test\TestComponent.cshtml(1,1): Warning RZ2012: Component 'ComponentWithRequiredGroup' expects a value for the parameter 'Property2', but a value may not have been provided.
+x:\dir\subdir\Test\TestComponent.cshtml(1,1): Warning RZ2012: Component 'ComponentWithRequiredGroup' expects a value for the parameter 'Property3', but a value may not have been provided.
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.ir.txt
new file mode 100644
index 000000000..f0708c0f9
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredGroup_SomeValueSpecified_MultipleGroups/TestComponent.ir.txt
@@ -0,0 +1,13 @@
+Document -
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase -
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [52] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithRequiredGroup
+                    ComponentAttribute - (39:0,39 [9] x:\dir\subdir\Test\TestComponent.cshtml) - Property1 - Property1 - AttributeStructure.DoubleQuotes
+                        HtmlContent - (39:0,39 [9] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (39:0,39 [9] x:\dir\subdir\Test\TestComponent.cshtml) - Html - SomeValue
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..14a24d17d
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,22 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithEditorRequiredChildContent>(0);
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.diagnostics.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.diagnostics.txt
new file mode 100644
index 000000000..ae41788d3
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.diagnostics.txt
@@ -0,0 +1 @@
+x:\dir\subdir\Test\TestComponent.cshtml(1,1): Warning RZ2012: Component 'ComponentWithEditorRequiredChildContent' expects a value for the parameter 'Found', but a value may not have been provided.
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..2b0cf7198
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_NoValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,10 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [85] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..689b78d66
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,26 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithEditorRequiredChildContent>(0);
+            __builder.AddAttribute(1, "Found", (Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+                __builder2.AddMarkupContent(2, "<h1>Here\'s Johnny!</h1>");
+            }
+            ));
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..5ad404edd
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredNamedChildContent_ValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,12 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [129] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredChildContent
+                    ComponentChildContent - (47:1,4 [38] x:\dir\subdir\Test\TestComponent.cshtml) - Found - context
+                        MarkupBlock -  - <h1>Here's Johnny!</h1>
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..1c8d727f1
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,22 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithEditorRequiredParameters>(0);
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.diagnostics.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.diagnostics.txt
new file mode 100644
index 000000000..bfd22f324
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.diagnostics.txt
@@ -0,0 +1 @@
+x:\dir\subdir\Test\TestComponent.cshtml(1,1): Warning RZ2012: Component 'ComponentWithEditorRequiredParameters' expects a value for the parameter 'Property1', but a value may not have been provided.
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..2fb846577
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_NoValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,10 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [41] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredParameters
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.codegen.cs
new file mode 100644
index 000000000..f28daeec9
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.codegen.cs
@@ -0,0 +1,23 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithEditorRequiredParameters>(0);
+            __builder.AddAttribute(1, "Property1", "Some Value");
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.ir.txt
new file mode 100644
index 000000000..8593a60ae
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValueSpecified/TestComponent.ir.txt
@@ -0,0 +1,13 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [64] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredParameters
+                    ComponentAttribute - (50:0,50 [10] x:\dir\subdir\Test\TestComponent.cshtml) - Property1 - Property1 - AttributeStructure.DoubleQuotes
+                        HtmlContent - (50:0,50 [10] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (50:0,50 [10] x:\dir\subdir\Test\TestComponent.cshtml) - Html - Some Value
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.codegen.cs b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.codegen.cs
new file mode 100644
index 000000000..31592fae8
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.codegen.cs
@@ -0,0 +1,31 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+    public partial class TestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<Test.ComponentWithEditorRequiredParameters>(0);
+            __builder.AddMultipleAttributes(1, global::Microsoft.AspNetCore.Components.CompilerServices.RuntimeHelpers.TypeCheck<global::System.Collections.Generic.IEnumerable<global::System.Collections.Generic.KeyValuePair<string, object>>>(
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+                                                      new Dictionary<string, object>()
+
+#line default
+#line hidden
+#nullable disable
+            ));
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591
diff --git a/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.ir.txt b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.ir.txt
new file mode 100644
index 000000000..cff4f423c
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/Component_WithEditorRequiredParameter_ValuesSpecifiedUsingSplatting/TestComponent.ir.txt
@@ -0,0 +1,12 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [14] ) - System
+        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [19] ) - System.Linq
+        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
+        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [91] x:\dir\subdir\Test\TestComponent.cshtml) - ComponentWithEditorRequiredParameters
+                    Splat - (52:0,52 [35] x:\dir\subdir\Test\TestComponent.cshtml)
+                        LazyIntermediateToken - (54:0,54 [32] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - new Dictionary<string, object>()
diff --git a/src/Microsoft.CodeAnalysis.Razor/src/ComponentTagHelperDescriptorProvider.cs b/src/Microsoft.CodeAnalysis.Razor/src/ComponentTagHelperDescriptorProvider.cs
index 195f29e89..ed16a2e07 100644
--- a/src/Microsoft.CodeAnalysis.Razor/src/ComponentTagHelperDescriptorProvider.cs
+++ b/src/Microsoft.CodeAnalysis.Razor/src/ComponentTagHelperDescriptorProvider.cs
@@ -172,6 +172,7 @@ private void CreateProperty(TagHelperDescriptorBuilder builder, IPropertySymbol
                 pb.Name = property.Name;
                 pb.TypeName = property.Type.ToDisplayString(FullNameTypeDisplayFormat);
                 pb.SetPropertyName(property.Name);
+                pb.IsEditorRequired = property.GetAttributes().Any(a => a.AttributeClass.ToDisplayString() == "Microsoft.AspNetCore.Components.EditorRequiredAttribute");
 
                 if (kind == PropertyKind.Enum)
                 {
diff --git a/src/Microsoft.CodeAnalysis.Razor/test/ComponentTagHelperDescriptorProviderTest.cs b/src/Microsoft.CodeAnalysis.Razor/test/ComponentTagHelperDescriptorProviderTest.cs
index 4a0e2c676..e854b6c9b 100644
--- a/src/Microsoft.CodeAnalysis.Razor/test/ComponentTagHelperDescriptorProviderTest.cs
+++ b/src/Microsoft.CodeAnalysis.Razor/test/ComponentTagHelperDescriptorProviderTest.cs
@@ -426,6 +426,55 @@ public class MyComponent : ComponentBase
             Assert.False(attribute.IsStringProperty);
         }
 
+        [Fact] // editor-required parameters
+        public void Execute_EditorRequiredProperty_CreatesDescriptor()
+        {
+            // Arrange
+
+            var compilation = BaseCompilation.AddSyntaxTrees(Parse(@"
+using Microsoft.AspNetCore.Components;
+
+namespace Test
+{
+    public class MyComponent : ComponentBase
+    {
+        [Parameter]
+        [EditorRequired]
+        public string MyProperty { get; set; }
+    }
+}
+
+"));
+
+            Assert.Empty(compilation.GetDiagnostics());
+
+            var context = TagHelperDescriptorProviderContext.Create();
+            context.SetCompilation(compilation);
+
+            var provider = new ComponentTagHelperDescriptorProvider();
+
+            // Act
+            provider.Execute(context);
+
+            // Assert
+            var components = ExcludeBuiltInComponents(context);
+            components = AssertAndExcludeFullyQualifiedNameMatchComponents(components, expectedCount: 1);
+            var component = Assert.Single(components);
+
+            Assert.Equal("TestAssembly", component.AssemblyName);
+            Assert.Equal("Test.MyComponent", component.Name);
+
+            var attribute = Assert.Single(component.BoundAttributes);
+            Assert.Equal("MyProperty", attribute.Name);
+            Assert.Equal("System.String", attribute.TypeName);
+
+            Assert.False(attribute.HasIndexer);
+            Assert.False(attribute.IsBooleanProperty);
+            Assert.False(attribute.IsEnum);
+            Assert.True(attribute.IsStringProperty);
+            Assert.True(attribute.IsEditorRequired);
+        }
+
         [Fact]
         public void Execute_GenericProperty_CreatesDescriptor()
         {
diff --git a/src/test/Microsoft.AspNetCore.Razor.Test.ComponentShim/Microsoft.AspNetCore.Components.netstandard2.0.cs b/src/test/Microsoft.AspNetCore.Razor.Test.ComponentShim/Microsoft.AspNetCore.Components.netstandard2.0.cs
index 6b51474c3..7e807c0f6 100644
--- a/src/test/Microsoft.AspNetCore.Razor.Test.ComponentShim/Microsoft.AspNetCore.Components.netstandard2.0.cs
+++ b/src/test/Microsoft.AspNetCore.Razor.Test.ComponentShim/Microsoft.AspNetCore.Components.netstandard2.0.cs
@@ -1,6 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
+
 namespace Microsoft.AspNetCore.Components
 {
     public static partial class BindConverter
@@ -375,6 +377,11 @@ public void Attach(Microsoft.AspNetCore.Components.RenderHandle renderHandle) {
         protected virtual void Render(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder builder) { }
         public System.Threading.Tasks.Task SetParametersAsync(Microsoft.AspNetCore.Components.ParameterView parameters) { throw null; }
     }
+    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
+    public partial class EditorRequiredAttribute : Attribute
+    {
+        public EditorRequiredAttribute() { }
+    }
 }
 namespace Microsoft.AspNetCore.Components.CompilerServices
 {