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.

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

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