Interface in C#

MSDN states that, "An interface defines a set of members, such as properties and procedures, that classes and structures can implement. The interface defines only the signatures of the members and not their internal workings."

This means that an interface is a definition of what an object does, but it doesn’t say how the object does it. Here’s an example to illustrate that "what versus how" difference.

 

   1: interface IMyInterface

   2: {

   3:     void MethodToImplement();

   4: }

Defining an Interface.
   1: class InterfaceImplementer : IMyInterface

   2: {

   3:     static void Main()

   4:     {

   5:         InterfaceImplementer iImp = new InterfaceImplementer();

   6:         iImp.MethodToImplement();

   7:     }

   8:  

   9:     public void MethodToImplement()

  10:     {

  11:         Console.WriteLine("MethodToImplement() called.");

  12:     }

  13: }

Using an Interface
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