using System;

using System.Collections.Generic;

​

public interface IAction {}

public interface IAction<T> : IAction

{

    string Do(T t);

}

​

​

public abstract class Base

{

    public string Name{ get; set; }

}

​

public class Foo : Base {}

public class FooAction : IAction<Foo>

{

    public string Do(Foo f) { return "Got Foo: " + f.Name; }    

}

​

public class Qux : Base {}

public class QuxAction : IAction<Qux>

{

    public string Do(Qux q) { return "Got Qux: " + q.Name; }    

}

​

​

​

public enum Bar { X, Y, Z }

public class BarAction : IAction<Bar>

{

    public string Do(Bar b) { return "Got Bar value: " + b; }   

}

​

public class Program

{

    Dictionary<Type, IAction> m_actions = new Dictionary<Type, IAction>();

    public void Register<T>(IAction<T> action)

    {

        m_actions.Add(typeof(T), action);

    }

    public string Get(object t)

    {

        var action = m_actions[t.GetType()];

        return ((dynamic)action).Do((dynamic)t);

    }

    public static void Main()

    {   

        Base foo = new Foo{ Name = "Baz" };

        Base qux = new Qux{ Name = "Qaz" };

        var bar = Bar.Y;

        var fooAction = new FooAction();

        var quxAction = new QuxAction();

        var barAction = new BarAction();

        var program = new Program();

        program.Register<Foo>(fooAction);

        program.Register<Bar>(barAction);

        program.Register<Qux>(quxAction);

        Console.WriteLine(program.Get(foo));

        Console.WriteLine(program.Get(qux));

        Console.WriteLine(program.Get(bar));

    }

}