DesignPattern_Behavioral_Command

using System.Collections.Generic;

namespace DesignPattern.Behavioral.Command
{
    public class Receiver
    {
        public void ShowA() { }
        public void ShowB() { }
    }

    public class Invoker
    {
        public List<Command> Commands { get; set; }
        public void Add(Command command) { Commands.Add(command); }
        public void Remove(Command command) { Commands.Remove(command); }

        public void Notify()
        {
            foreach (var command in Commands)
            {
                command.Show();
            }
        }
    }
    public abstract class Command
    {
        protected Receiver Receiver = new Receiver();
        public abstract void Show();
    }
    public class CommandA : Command
    {
        public override void Show()
        {
            Receiver.ShowA();
        }
    }
    public class CommandB : Command
    {
        public override void Show()
        {
            Receiver.ShowB();
        }
    }
}