using System;

using System.Linq;

using System.Collections.Generic;

​

public interface IMessage

{

    int Id { get; set; }

}

​

public class Message : IMessage

{

    public int Id { get; set; }

    public string Name { get; set; }

}

public class Program

{

    private static Dictionary<Type, Action<IMessage>> subActions = new Dictionary<Type, Action<IMessage>>();

​

    private static void Subscribe<TMessage>(Action<TMessage> action) 

        where TMessage : IMessage

    {

        subActions.Add(typeof(TMessage), x => action((TMessage)x));

    }

    public static void Main()

    {

        Subscribe<Message>(x => x.Name = "Test");

        var probe = new Message();

        subActions.First().Value(probe);

        Console.WriteLine(probe.Name);

    }

}