Interview Question about INTERFACE

Question

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We have common method in two different interface(I1, I2), how to call method of I2 ? OR Is it possible to create same method name in different Interface, please guide me any one...

Thanks in Advance.....

Posted 3-Dec-13 23:05pm

peer mohammed.A

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4 solutions

Solution 1

Yes we can create.
You can have a look here with this link. You will be able to understand better.
http://stackoverflow.com/questions/2371178/inheritance-from-multiple-interfaces-with-the-same-method-name-in-c-sharp[^]

Posted 3-Dec-13 23:09pm

Thomas ktg

Solution 2

Yes you can.

Let me show you

C#

public interface IT1
{
 void Test();
}

public interface IT2
{
void Test();
}

public class C1 : IT1,IT2
{
void IT1.Test()
{
Console.Write("IT1 Implementation"); 
}
public void Test()
{
Console.Write("IT2 Implementation");
}
}

Enjoy...

Posted 3-Dec-13 23:12pm

Suvabrata Roy

Solution 4

C#

namespace ExplConsole
{
    class Program 
    {
        static void Main ()
        {
            System.Console.WriteLine("Permission for User1");
            User1 usr1 = new Test(); // Create instance.
            usr1.Read(); // Call method on interface.
            usr1.Write();
            System.Console.WriteLine("Permission for User2");
            User2 usr2 = new Test();
            usr2.Write();
            usr2.Execute();
            System.Console.ReadKey();
        }
    }
    interface User1
    {
        void Read();
        void Write();
    }
    interface User2
    {
        void Write();
        void Execute();
    }
    class Test : NewTest,User1, User2 
    {
        public void Read()
        {
            Console.WriteLine("Read");
        }
        public void Write()
        {
            Console.WriteLine("Write");
        }
    }
    class NewTest 
    {
        public void Execute()
        {
            Console.WriteLine("Execute");
        }
    }
}

Output:

C#

Permission for User1
   Read
   Write
   Permission for User2
   Write
   Execute

Posted 3-Dec-13 23:18pm

Siva Hyderabad

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OriginalGriff · Accepted Answer · 2013-12-03T23:13:00

Yes. All you have to do is access it via a cast to the appropriate Interface:

C#

public interface Ia
    {
    void Common();
    }
public interface Ib
    {
    void Common();
    }
public class MyClassImplicit : Ia, Ib
    {
    public void Common()
        {
        Console.WriteLine("Common");
        }
    }
public class MyClassExplicit : Ia, Ib
    {
    void Ia.Common()
        {
        Console.WriteLine("Common Ib");
        }
    void Ib.Common()
        {
        Console.WriteLine("Common Ia");
        }
    }

C#

MyClassImplicit mci = new MyClassImplicit();
mci.Common();
MyClassExplicit mce = new MyClassExplicit();
((Ia)mce).Common();
((Ib)mce).Common();
// mce.Common();  //*** Will not compile if uncommented