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:

  1. 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:

Program of delegates in Console

Here is the Code of Delegates:

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  6. namespace Delegates_demo
  7. {
  8. public delegate int Mydelegate(int x,int y);
  9. class sample
  10. {
  11. public static int rectangle(int a, int b)
  12. {
  14. return a * b;
  15. }
  17. }
  19. class Program
  20. {
  21. static void Main(string[] args)
  22. {
  23. Console.WriteLine("My simple Delegate Program");
  24. Mydelegate mdl = new Mydelegate(sample.rectangle);
  25. Console.WriteLine("The Area of rectangle is {0}", mdl(4, 5));
  26. Console.ReadKey();
  27. }
  28. }
  29. }
Output of Delegates:

Output of Delegates

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