Simple Program of Delegates in C#

Delegates

C# Contains two kinds of objects, those that create changes and those that respond to that changes. A Delegates acts as a tunnel between these two kinds of objects that move information from one side to another.

A C# delegates are class methods and can be either static or instance class methods. A delegate can keep track of its own state by maintain information in the object to which it belongs.

We can create delegates by using “Delegate” Keyword as shown below:

Public delegate int MyDelegate (int x);

A Delegate is not a method or a function it’s a kind of definition of function pointer. Therefore you cannot directly use a Delegate you need a function associated with it.

For creating a delegate use these two steps: 

1. You need to have a delegate in a class that acts the conduit pointer for use by the delegate source.
   
   
2. You need a live method that acts as the concrete functionality that is called when delegate is invoked.

Let’s Create one simple Program of delegates in Console:



Here is the Code of Delegates:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Delegates_demo
{
    public delegate int Mydelegate(int x,int y);
    class sample
    {
        public static int rectangle(int a, int b)
        {

            return a * b;
        }

    }

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("My simple Delegate Program");
            Mydelegate mdl = new Mydelegate(sample.rectangle);
            Console.WriteLine("The Area of rectangle is {0}", mdl(4, 5));
            Console.ReadKey();
        }
    }
}

Output of Delegates:



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