Add support for multiple registry views.

src/DeviceId.Windows/Components/RegistryValueDeviceIdComponent.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using Microsoft.Win32;
 
 namespace DeviceId.Windows.Components;
@@ -10,14 +12,14 @@ public class RegistryValueDeviceIdComponent : IDeviceIdComponent
 {
 #if !NET35
     /// <summary>
-    /// The registry hive.
+    /// The registry views.
     /// </summary>
-    private readonly RegistryHive _registryHive;
+    private readonly RegistryView[] _registryViews;
 
     /// <summary>
-    /// The registry views.
+    /// The registry hive.
     /// </summary>
-    private readonly RegistryView _registryView;
+    private readonly RegistryHive _registryHive;
 #endif
 
     /// <summary>
@@ -76,9 +78,20 @@ public RegistryValueDeviceIdComponent(RegistryView registryView, RegistryHive re
     /// <param name="valueName">The name of the registry value.</param>
     /// <param name="formatter">An optional function to use to format the value before returning it.</param>
     public RegistryValueDeviceIdComponent(RegistryView registryView, RegistryHive registryHive, string keyName, string valueName, Func<string, string> formatter)
+        : this(new RegistryView[] { registryView }, registryHive, keyName, valueName, formatter) { }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="RegistryValueDeviceIdComponent"/> class.
+    /// </summary>
+    /// <param name="registryViews">The registry views.</param>
+    /// <param name="registryHive">The registry hive.</param>
+    /// <param name="keyName">The name of the registry key.</param>
+    /// <param name="valueName">The name of the registry value.</param>
+    /// <param name="formatter">An optional function to use to format the value before returning it.</param>
+    public RegistryValueDeviceIdComponent(IEnumerable<RegistryView> registryViews, RegistryHive registryHive, string keyName, string valueName, Func<string, string> formatter)
     {
+        _registryViews = registryViews.ToArray();
         _registryHive = registryHive;
-        _registryView = registryView;
         _keyName = keyName;
         _valueName = valueName;
         _formatter = formatter;
@@ -92,6 +105,10 @@ public RegistryValueDeviceIdComponent(RegistryView registryView, RegistryHive re
     public string GetValue()
     {
 #if NET35
+        // In .NET 3.5, it's not possible to specify the registry view.
+        // Technically I could write some native API calls to do it properly,
+        // but we're going to drop support for .NET 3.5 soon anyway, so I don't really want to bother.
+
         try
         {
             var value = Registry.GetValue(_keyName, _valueName, null);
@@ -105,23 +122,24 @@ public string GetValue()
         }
         catch { }
 #else
-        try
+        foreach (var registryView in _registryViews)
         {
-            using var registry = RegistryKey.OpenBaseKey(_registryHive, _registryView);
-            using var subKey = registry.OpenSubKey(_keyName);
-            if (subKey != null)
+            try
             {
-                var value = subKey.GetValue(_valueName);
-                var valueAsString = value?.ToString();
-                if (valueAsString is null)
+                using var registry = RegistryKey.OpenBaseKey(_registryHive, registryView);
+                using var subKey = registry.OpenSubKey(_keyName);
+                if (subKey != null)
                 {
-                    return null;
+                    var value = subKey.GetValue(_valueName);
+                    var valueAsString = value?.ToString();
+                    if (valueAsString != null)
+                    {
+                        return _formatter?.Invoke(valueAsString) ?? valueAsString;
+                    }
                 }
-
-                return _formatter?.Invoke(valueAsString) ?? valueAsString;
             }
+            catch { }
         }
-        catch { }
 #endif
 
         return null;