Add MethodInfo.CrateDelegate<T> (#306)

Author: pengweiqhca

src/Polyfill/Polyfill_MethodInfo.cs

@@ -0,0 +1,30 @@
+// <auto-generated />
+#pragma warning disable
+
+#if !NET5_0_OR_GREATER
+
+namespace Polyfills;
+
+using System;
+using System.Reflection;
+
+static partial class Polyfill
+{
+    /// <summary>
+    /// Creates a delegate of type T with the specified target from this method.
+    /// </summary>
+    /// <typeparam name="T">The type of the delegate to create.</typeparam>
+    /// <returns>The delegate for this method.</returns>
+    //Link: https://learn.microsoft.com/en-us/dotnet/api/System.Reflection.MethodInfo.CreateDelegate#system-reflection-methodinfo-createdelegate-1
+    public static T CreateDelegate<T>(this MethodInfo method) where T : Delegate => (T)method.CreateDelegate(typeof(T));
+
+    /// <summary>
+    /// Creates a delegate of type T with the specified target from this method.
+    /// </summary>
+    /// <param name="target">The object targeted by the delegate.</param>
+    /// <typeparam name="T">The type of the delegate to create.</typeparam>
+    /// <returns>The delegate for this method.</returns>
+    //Link: https://learn.microsoft.com/en-us/dotnet/api/System.Reflection.MethodInfo.CreateDelegate?#system-reflection-methodinfo-createdelegate-1(system-object)
+    public static T CreateDelegate<T>(this MethodInfo method, object? target) where T : Delegate => (T)method.CreateDelegate(typeof(T), target);
+}
+#endif