what is the use of Delegates and why it is use of delegates

Question

Hi gud evng  what is the use of Delegates and why it is use of delegates main reason plz tell me real time example thanks for advance

Maroof Raini · Answer

You can think of a delegate as an authorized person on behalf of someone who can represent himself for a particular purpose. For example we have 2 methods as Square and Cube as below- int Square(int a) //An original Method { return a*a; } int Cube(int b) // An original Method { return a*a*a; } delegate int IAmADelegate(int num) /* A delegate who says that I can represent some method who takes one integer as parameter and returns an integer*/ protected void Page_Load(object sender EventArgs e) { IAmADelegate IMD += new IAmADelegate(Sqaure); /*I am a delegate who will represent Square method so now you can get your task done from me. (Actually I will point your parameter to square method and the method will return its value)*/ Response.Write(IMD(10).ToString()); // Returns 100 Response.Write( ); IMD += IAmADelegate(Cube); /* Now I am a delegate who will represent Cube method so now you can get your task done from me. (Actually this time I will point your parameter to cube method to get the cube) --- See my skill here now I am representing Cube means I can represent any method who takes one integer and returns an integer this is why I am used happily */ Response.Write(a(10).ToString()); // Returns 1000 } In below example its delegate who actually points the method which needs to be executed on click of the button as end with Handles button click Private Sub cmdSave_Click(ByVal sender As System.Object ByVal e As System.EventArgs) Handles cmdSave.Click

sureshkumar sp · Answer

Hi Best understand of Delegates is can like in OOPS methodology we can use the value of the member variables in bi-direction right only can call the member function and get the result. If you want to define a method definition from out side the object or allow the people to change your method definition delegates support for that. By delegates we can pass method as parameter to a function or to any instance. Keyword : delegate : [Access Modifier] delegate return type DelegateName( [arguments] ) Find the attachment to for more your reference.