using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        IMessageOperationOneWay message = new MessageOperationOneWay();

        message.ProcessMessage("Hello World");

    }

}

​

public interface IMessageOperation 

{

    void ProcessMessage(string message);

}

​

public interface IMessageOperationOneWay

{

    void ProcessMessage(string message);

}

​

​

public abstract class MessageOperationBase : IMessageOperation 

{

  public virtual void ProcessMessage(string message) 

  {

    Console.WriteLine("This is from MessageOperationBase");

     return;

  }

}

​

public class MessageOperationOneWayClient: MessageOperationBase 

{

   public override void ProcessMessage(string message) 

   {

      base.ProcessMessage(message);

   }

}

​

public abstract class ClientBase<T> where T: class

{

    public T Channel;

    public ClientBase() 

    {

      Channel = (T)Activator.CreateInstance(typeof(MessageOperationOneWayClient));

    }

}

​

public class MessageOperationOneWay : ClientBase<IMessageOperation>, IMessageOperationOneWay 

{

  public void ProcessMessage(string message) 

  {

    Console.WriteLine("This is from Child");

    base.Channel.ProcessMessage(message);

  }

}