using System;                    

namespace Example

{

    public class BaseTypeClass {}

​

    public class BaseTypeV1 : BaseTypeClass {}

​

    public class BaseTypeV2 : BaseTypeClass {}

​

    public class BaseTypeV3 : BaseTypeClass {}

​

​

​

    public interface IProcessBaseType

    {

        void Process(BaseTypeClass baseType);

    }

​

    public interface IProcessBaseType<T> : IProcessBaseType where T : BaseTypeClass

    {

          void Process(T baseType);

    }

​

​

    public class ProcessBassTypeClass : IProcessBaseType

    {

        public void Process(BaseTypeClass data)

        {

            Console.WriteLine("Processing as BaseTypeClass");

        }

        public void Process<T>(T data)

        {

            Console.WriteLine("Processing as generic with T = {0}", typeof(T).Name);

        }

    }

    public class MyProgram 

    { 

        static public void Main(string[] args) 

        {

            var processor = new ProcessBassTypeClass();

​

            processor.Process( new BaseTypeClass() );

            processor.Process( new BaseTypeV1() );

            processor.Process( new BaseTypeV2() );

            processor.Process( new BaseTypeV3() );

        } 

    } 

}

​