using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<Action> actions = new List<Action>(2);

        ActionUrl actionUrl = new ActionUrl();

        ActionBundle actionBundle = new ActionBundle();

        actions.Add(actionUrl);

        actions.Add(actionBundle);

        Console.WriteLine($"# = {actions.Count()}");

    }

    public class Action{

        public int Id {get;}

    }

    public class ActionUrl : Action{

        public Uri Uri {get;}   

    }

    public class ActionBundle : Action {

        public string bundleThings {get;}   

    }

}