Add RegistryExtensions with ContainsSubKey

PowerKit.Tests/RegistryExtensionsTests.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Runtime.Versioning;
+using FluentAssertions;
+using Microsoft.Win32;
+using PowerKit.Extensions;
+using Xunit;
+
+namespace PowerKit.Tests;
+
+public class RegistryExtensionsTests
+{
+    [SkippableFact]
+    [SupportedOSPlatform("windows")]
+    public void ContainsSubKey_Exists_Test()
+    {
+        Skip.IfNot(OperatingSystem.IsWindows());
+
+        // Arrange
+        using var key = Registry.CurrentUser.OpenSubKey("Software", true)!;
+        var subKeyName = $"PowerKit.Tests.{Guid.NewGuid():N}";
+
+        try
+        {
+            using var subKey = key.CreateSubKey(subKeyName);
+
+            // Act & assert
+            key.ContainsSubKey(subKeyName).Should().BeTrue();
+        }
+        finally
+        {
+            key.DeleteSubKeyTree(subKeyName, false);
+        }
+    }
+
+    [SkippableFact]
+    [SupportedOSPlatform("windows")]
+    public void ContainsSubKey_NotExists_Test()
+    {
+        Skip.IfNot(OperatingSystem.IsWindows());
+
+        // Arrange
+        using var key = Registry.CurrentUser.OpenSubKey("Software", false)!;
+
+        // Act & assert
+        key.ContainsSubKey("this-sub-key-definitely-does-not-exist").Should().BeFalse();
+    }
+}

PowerKit/Extensions/RegistryExtensions.cs

@@ -0,0 +1,22 @@
+#if NETFRAMEWORK || NET5_0_OR_GREATER
+using System.Runtime.Versioning;
+using Microsoft.Win32;
+
+namespace PowerKit.Extensions;
+
+internal static class RegistryExtensions
+{
+    extension(RegistryKey key)
+    {
+        /// <summary>
+        /// Checks whether a sub-key with the specified name exists under the registry key.
+        /// </summary>
+        [SupportedOSPlatform("windows")]
+        public bool ContainsSubKey(string name)
+        {
+            using var subKey = key.OpenSubKey(name, false);
+            return subKey is not null;
+        }
+    }
+}
+#endif