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Interface in C#.Net


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Interface in C#.Net

An interface contains only the signatures of methods, delegates or events. An interface looks like a class, but has no implementation. The only thing it contains is declarations of events, indexers, methods and/or properties. Interfaces in C # provide a way to achieve runtime polymorphism.

Why Use Interfaces?

To allows a class to inherit multiple behaviors from multiple interfaces.

To avoid name ambiguity between the methods of the different classes as was in the use of multiple inheritances in C++.

To combine two or more interfaces such that a class need only implement the combined result. The example code for this is provided as a source file to be downloaded.

To allows Name hiding: Name hiding is the ability to hide an inherited member name from any code outside the derived class.

Defining an Interface

interface IMyInterface
{
void MethodToImplement();
}

Implementation of Interface

class InterfaceImplementer : IMyInterface
{
static void Main()
{
InterfaceImplementer iImp =
new InterfaceImplementer();
iImp.MethodToImplement();
}

public
void MethodToImplement()
{
Console.WriteLine("MethodToImplement() called.");
}
}

Compile example:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace @interface

{

    interface IMyInterface

    {

        void MethodToImplement();

    }

       class InterfaceImplementer : IMyInterface

    {

        static void Main()

        {

            InterfaceImplementer iImp = new InterfaceImplementer();

            iImp.MethodToImplement();

            Console.ReadLine();

        }

        public void MethodToImplement()

        {

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

        }

    }

}

Output:

MethodToImplement() called.


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