// C# Extension Method

// Doc: [url will be determined later]

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    delegate void CustomDel(string s);

    public static void Hello(string s)

    {

        System.Console.WriteLine("  Hello, {0}!", s);

    }

​

    public static void Goodbye(string s)

    {

        System.Console.WriteLine("  Goodbye, {0}!", s);

    }

​

    public static void Main()

    {

        CustomDel hiDel, byeDel;

        hiDel = Hello;

        byeDel = Goodbye;

​

        // C# Extension Method: Delegate - Combine

        var combineDel = (CustomDel)Delegate.Combine(hiDel, byeDel);

        //var combineDel = (CustomDel)hiDel.Combine(byeDel);

​

        combineDel("World!");

        Console.WriteLine("\n\nAfter calling Remove, bye delegate is removed.\n\n");

​

        // C# Extension Method: Delegate - Remove

        var removeDel = (CustomDel)combineDel.Remove(byeDel);

​

        removeDel("World!");

    }

}