What is Delegates?

Delegate is a type Safe Object that can point to another  method(or possibly multiple method) in the application , Which can be invoked at later time.

—  Delegate act as an intermediary between an event source and an event  destination.

—  A delegate in C# is similar to a function pointer in c or c++.

—  There are Two Type of  delegate.

1. Single cast Delegate
2. Multi cast Delegate                                   

—  A Single Cast Delegate Can call only one function.

—  A Multi Cast Delegate Can call more than  one function.

—  Delegate are used to pass method as-argument to other methods that are invoked through delegates.

—  “Once a delegate is assigned a method , it behave exactly like that method. The delegate method can be used like any .Other  method , which parameter and a return value.”

—  Delegate type maintains Three important Information.

—  The name of the method on which it make calls.

—  Any argument(if any)of this method.

—  The Return value(if any)of this method.

—  Function pointer using Delegate.

—  Delegate wrap a method.calling delegate result in calling the method.

—  Delegate is a type of object very similar to classes.

—  Delegate gives a name to a method signature.

—  Declaration Of delegate

public delegate intSumPtr(intx,int y);

•       Method of delegate.

int  Add(intx,int y)

          {

returnx+y;

                }

use a delegate to call this method.

SumPtrsPtr= new Sumptr(Add);

Console.WriteLine(sPtr(34,6));

—  Example Of Delegate

Using System;

Namespace Akadia.BasicDelegate

{

public delegate void simpledelegate();   //Declaration

classTestDelegate

    {

                public static void MyFunc()

        {

                Console.WriteLine(“I was called by delegate”);

}

Public static void main()

{

                SimpleDelegateSimpleDelegate=new  SimpleDelegate(MyFunc);   //Instantiation

                SimpleDelegate();     //Invocation

}