Add RegistryHive extension members: Moniker and OpenKey

PowerKit.Tests/Extensions/RegistryExtensionsTests.cs

@@ -9,6 +9,20 @@ namespace PowerKit.Tests.Extensions;
 
 public class RegistryExtensionsTests
 {
+    [SkippableFact]
+    [SupportedOSPlatform("windows")]
+    public void OpenKey_Test()
+    {
+        Skip.IfNot(OperatingSystem.IsWindows());
+
+        // Act
+        using var key = RegistryHive.CurrentUser.OpenKey(RegistryView.Default);
+
+        // Assert
+        key.Should().NotBeNull();
+        key.Name.Should().Be(Registry.CurrentUser.Name);
+    }
+
     [SkippableFact]
     [SupportedOSPlatform("windows")]
     public void ContainsSubKey_Exists_Test()

PowerKit/Extensions/RegistryExtensions.cs

@@ -1,5 +1,6 @@
 #if NETFRAMEWORK || NET5_0_OR_GREATER
 #nullable enable
+using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.Versioning;
 using Microsoft.Win32;
@@ -11,6 +12,34 @@ namespace PowerKit.Extensions;
 #endif
 internal static class RegistryExtensions
 {
+    extension(RegistryHive hive)
+    {
+        /// <summary>
+        /// Returns the short moniker for the registry hive (e.g. <c>HKCU</c>, <c>HKLM</c>).
+        /// </summary>
+        [SupportedOSPlatform("windows")]
+        public string Moniker =>
+            hive switch
+            {
+                RegistryHive.ClassesRoot => "HKCR",
+                RegistryHive.CurrentUser => "HKCU",
+                RegistryHive.LocalMachine => "HKLM",
+                RegistryHive.Users => "HKU",
+                RegistryHive.PerformanceData => "HKPD",
+                RegistryHive.CurrentConfig => "HKCC",
+                _ => throw new ArgumentOutOfRangeException(nameof(hive)),
+            };
+
+#if NET40_OR_GREATER || NET5_0_OR_GREATER
+        /// <summary>
+        /// Opens the base registry key for the hive using the specified <paramref name="view" />.
+        /// </summary>
+        [SupportedOSPlatform("windows")]
+        public RegistryKey OpenKey(RegistryView view = RegistryView.Default) =>
+            RegistryKey.OpenBaseKey(hive, view);
+#endif
+    }
+
     extension(RegistryKey key)
     {
         /// <summary>