using System;

using System.Runtime.InteropServices;

public class MyTestClass

{

        delegate int BarFunc(int a);

        public void Foo()

        {

            BarFunc del = Bar;

            IntPtr funcPtr = Marshal.GetFunctionPointerForDelegate(del);

        }

​

        public int Bar(int a)

        {

            return 0;

        }

}

​

public class Program

{

    public static void Main()

    {

        var mtc = new MyTestClass();

        mtc.Foo();

    }

}