Merge pull request #11 from dotnet-campus/t/lvyi/key-value-pair

Add deconstruct for KeyValuePair

Author: lindexi

src/DotNetCampus.LatestCSharpFeatures.Analyzer/Generators/FeatureGenerator.cs

@@ -18,6 +18,9 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
 
     private void OnExecute(IncrementalGeneratorPostInitializationContext context)
     {
+        // .NET Core 3.0 / .NET Standard 2.1 才开始支持 KeyValuePair 的 Deconstruct 方法。
+        GenerateFeatureSource(context, "KeyValuePair");
+
         // .NET Core 3.0 / .NET Standard 2.1 才开始支持 Nullable；.NET 5.0 开始支持更多。
         GenerateFeatureSource(context, "Nullable");
 

src/DotNetCampus.LatestCSharpFeatures/KeyValuePair/KeyValuePair.g.cs

@@ -0,0 +1,27 @@
+#nullable enable
+namespace System.Collections.Generic;
+
+#if NETSTANDARD2_1 || NETCOREAPP3_0 || NETCOREAPP3_1 || NET5_0_OR_GREATER
+#else
+/// <summary>
+/// Provide extension methods for <see cref="KeyValuePair{TKey,TValue}"/>.
+/// </summary>
+#if USE_PUBLIC_LATEST_CSHARP_FEATURES
+    public
+#else
+internal
+#endif
+    static class DotNetCampusLatestCSharpFeaturesKeyValuePairExtensions
+{
+#if USE_PUBLIC_LATEST_CSHARP_FEATURES
+    public
+#else
+    internal
+#endif
+        static void Deconstruct<TKey, TValue>(this KeyValuePair<TKey, TValue> pair, out TKey key, out TValue value)
+    {
+        key = pair.Key;
+        value = pair.Value;
+    }
+}
+#endif