how to create delegate in c# with example.

Delegate:- 

delegate means transfer power to someone.delegate looking same function to pointer in C or C++.using delegate method    allows the programmer to encapsulate a reference to method inside a delegate object.

Two types delegate 1) single cast : One object referring one function show example 1.

                              2)  multi cast : One object referring many function. show example 2.

signature should be same which function pass to delegate.

In delegate show main three point

  1) Declaring a delegate.

Declare a new delegate type.each delegate describes the number and types of argument and type of return value of methods that ti can encapsulate. 

The following statement  :- delegate void mydel(int a, int b);

                                               

     2) Instantiating a delegate. 

Once create delegate after create instantiating object must create associated with a particular method. argument pass with new expression is special .it is written like a method call, but without the argument to the method.

The following statement :-  mydel d1 = new mydel(p.add); (This is for single cast).

                                          d1+= new mydel(p.multiply); (This is for multi cast).

                                                   

 3)Calling a delegate.

Once delegate object create . delegate object typically pass to other code .that will call delegate.

The following statement :- d1(4, 5);

Use delegate show the example 1.

Output:

example 2:

Output: