CS8631 in System.Text.Json source generated code #78903
Comments
ghost
added
the
|
Tagging subscribers to this area: @dotnet/area-system-text-json, @gregsdennis Issue DetailsDescriptionSimple program produces warning/error (depends on TreatWarningsAsErrors switch) when using System.Text.Json source generator Reproduction StepsRepro <Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<LangVersion>latest</LangVersion>
<OutputType>Library</OutputType>
<TargetFramework>net6.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
</PropertyGroup>
</Project>using System.Collections.ObjectModel;
using System.Text.Json.Serialization;
namespace A;
[JsonSerializable(typeof(Class1))]
internal partial class MyJsonContext : JsonSerializerContext
{
}
public class Class1
{
public Class2? Property { get; set; }
}
public class Class2 : ReadOnlyDictionary<string, object?>
{
public Class2(IDictionary<string, object?> dictionary)
: base(dictionary)
{
}
}Expected behaviorNo warning/error. Actual behaviorError CS8631 The type 'A.Class2' cannot be used as type parameter 'TCollection' in the generic type or method 'JsonMetadataServices.CreateIDictionaryInfo<TCollection, TKey, TValue>(JsonSerializerOptions, JsonCollectionInfoValues)'. Nullability of type argument 'A.Class2' doesn't match constraint type 'System.Collections.Generic.IDictionary<string, object>'. Regression?No response Known WorkaroundsNo response ConfigurationOther informationNo response
|
|
Duplicate of #61734. Incidentally we've disabled nullability warnings in .NET 7 so upgrading to the latest STJ version should make the issue go away. |
Description
Simple program produces warning/error (depends on TreatWarningsAsErrors switch) when using System.Text.Json source generator
Reproduction Steps
Repro
Expected behavior
No warning/error.
Actual behavior
Error CS8631 The type 'A.Class2' cannot be used as type parameter 'TCollection' in the generic type or method 'JsonMetadataServices.CreateIDictionaryInfo<TCollection, TKey, TValue>(JsonSerializerOptions, JsonCollectionInfoValues)'. Nullability of type argument 'A.Class2' doesn't match constraint type 'System.Collections.Generic.IDictionary<string, object>'.
Regression?
No response
Known Workarounds
No response
Configuration
Other information
No response
The text was updated successfully, but these errors were encountered: