How to Create and use Multicast Delegate in C#

This blog explains how to create and use Multicast Delegate in C#.

Syntax of delegate

Delegate [ data-type ] [ delegate-name] [argument-list]

Following example demonstrates about Multicasting of a delegate with Arithmatic operations.When you instantiate a delegate, you can associate its instance with any method with a compatible signature and return type.

Let see the example:

using System;

namespace Delegate_Operation
{
    delegate int Delegate(int x, int y);

    class Delegate_Exmaple
    {
       static Delegate dobj = Add;

       static int Add(int a, int b)
        {
            return a + b;
        }

       static int Sub(int a, int b)
       {
           return a - b;
       }

       static int Mul(int a, int b)
       {
           return a * b;
       }

       static int Div(int a, int b)
       {
           return a / b;
       }
        static void Main(String[] args)
       {
            int call;

            call = dobj.Invoke(5, 5);
            Console.WriteLine("The Sum of {0} + {1} is : {2}",5,5,call);
            Console.WriteLine();

            dobj += new Delegate(Sub);
            call = dobj.Invoke(5, 5);
            Console.WriteLine("The Difference of {0} - {1} is : {2}", 5, 5, call);
            Console.WriteLine();

            dobj += new Delegate(Mul);
            call = dobj.Invoke(5, 5);
            Console.WriteLine("The Multiplication of {0} * {1} is : {2}", 5, 5, call);
            Console.WriteLine();

            dobj += new Delegate(Div);
            call = dobj.Invoke(5, 5);
            Console.WriteLine("The Divition of {0} / {1} is : {2}", 5, 5, call);

            Console.ReadKey();
        }
    }
}

Now deploy this code,so you will get following result

 

Hope, this example will help you..! Cheers....