using System;

​

namespace ConsoleApplication9

{

    public class Program

    {

        public static void Main(string[] args)

        {

            IGenericInterface<string> testClass = new GenericClass<string>();

​

            testClass.DoSomething<object>();

​

            Console.WriteLine();

​

            testClass.DoSomething2<object, string>();

​

            Console.ReadLine();

        }

    }

​

    public interface IGenericInterface<TSource>

    {

        void DoSomething<TDest>();

    }

​

    public class GenericClass<TSource> : IGenericInterface<TSource>

    {

        public void DoSomething<TDest>()

        {

            Console.WriteLine(">From DoSomething");

            Console.WriteLine("TSource type: {0}", typeof(TSource));

            Console.WriteLine("TDest type: {0}", typeof(TDest));

        }

    }

​

    internal static class Extensions

    {

        public static void DoSomething2<TDest, TSource>(this IGenericInterface<TSource> interf)

        {

            Console.WriteLine(">From DoSomething2");

            Console.WriteLine("TSource type: {0}", typeof(TSource));

            Console.WriteLine("TDest type: {0}", typeof(TDest));

        }

    }

}