Interface unable to encapsulate method

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As I learn that interface is also used for encapsulate method but in the following code by casting ojb to MainClass I am able to access other method from Mainclass which I did not declare in interface so now where is encapsulation occur.

C#

class Program
{
    static void Main(string[] args)
    {
        IInterface obj = new MainClass();
        Console.WriteLine(((MainClass)obj).FullName()+" " +obj.LastName());
        Console.WriteLine(((MainClass)obj).SayHello());
        Console.ReadKey();
    }
}

public interface IInterface
{
    string LastName();
}

public class MainClass:IInterface
{
    public  string FullName()
    {
        return "Raman Singh";
    }
    public string SayHello()
    {
        return "Hello Sir111";
    }

    public string LastName()
    {
        return "Chauhan";
    }
}

Posted 19-Jun-14 22:45pm

gurpreetsingh7431

Updated 19-Jun-14 22:54pm

Thanks7872

v2

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phil.o 20-Jun-14 4:57am

All of this has nothing to do with encapsulation. What makes you think it does?

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OriginalGriff · Answer 1 · 2014-06-19T22:59:00

I just answered a very similar question to this - and that was yours as well.

Don't repost - it wastes time and annoys people.

But - there is a difference here, in that you are declaring your variable obj as a IInterface Type, which means it can contains an instance of any class with implements IInterface, and casting the variable to a specific derived class type - which means that (if the cast is successful) it will be a MainClass instance and you can then use all MainClass fields, properties, and methods.

If it isn't a MainClass instance, but a different class that implements IInstance then you will get a runtime error from the cast - but the system cannot definitely know that until your application runs.