What is Abstract and interface

//Interface definition

public interface IFoo

{

    void Method1();

    void Method2();

}



// Abstract class derived from above Interface... Here we should provide implementation for all methods/classes that are in interface 

public abstract class BaseClass : IFoo 

{

    public void Method1()

    {

        // Common stuff for all BaseClassX classes

    }



    // Abstract method: it ensures IFoo is fully implemented

    // by all classes that inherit from BaseClass, but doesn't provide

    // any implementation right here.

    public abstract void Method2();

}



//observe the following two classes MyClass1 & MyClass2.. Same method "Method2()"  have two different implementation parts as per class

// By using override  it is possible..... Main advantage of Interface is that it provides only the method/class declarations & constants  and then different vendors can implement their own functionality by following common structure/signature

public class MyClass1 : BaseClass 

{

    public override void Method2()

    {

        // Specific stuff for MyClass1

        Console.WriteLine("Class1");

    }

}



public class MyClass2 : BaseClass

{

    public override void Method2()

    {

        // Specific stuff for MyClass2

        Console.WriteLine("Class2");

    }

}



private static void Main(string[] args)

{

    IFoo test1 = new MyClass1();

    IFoo test2 = new MyClass2();



    test1.Method2();

    test2.Method2();



    Console.ReadKey();

}

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Chandu
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Kumaraspcode2009@gmail.com

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Chandu
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