using System;

using System.Diagnostics;

​

class Program

{

    static void Main()

    {

        Test("GetAction1", GetAction1<int>());

        Test("GetAction2", GetAction2<int>());

        Test("GetAction1", GetAction1<int>());

        Test("GetAction2", GetAction2<int>());

    }

​

    static void Test(string title, MyAction<int> action)

    {

        Counter = 0;

        var stopwatch = Stopwatch.StartNew();

        for (int i = 0; i < 100_000_000; i++) action(i);

        stopwatch.Stop();

        Console.WriteLine($"{title}, Counter: {Counter:#,0}, Duration: {stopwatch.ElapsedMilliseconds:#,0} msec");

    }

​

    delegate void MyAction<T>(T val);

    static int Counter;

​

    // My suggestion

    static MyAction<T> GetAction1<T>()

        => new MyAction<T>((Action<T>)(object)ActionInt);

​

    // Enigmativity's suggestion

    static MyAction<T> GetAction2<T>()

        => (MyAction<T>)(Delegate)(MyAction<int>)ActionInt;

​

    static void ActionInt(int val) { Counter++; }

}

​