深入浅出设计模式——命令模式（Command Pattern）

namespace CommandPattern
{
    //抽象命令类
    public abstract class Command
    {
        protected Barbecuer receiver;
        public Command(Barbecuer receiver)
        {
            this.receiver = receiver;
        }
        //执行命令
        abstract public void ExecuteCommand();
    }
}

namespace CommandPattern
{
    //烤羊肉串命令
    class BakeMuttonCommand : Command
    {
        public BakeMuttonCommand(Barbecuer receiver)
            : base(receiver)
        {
        }
        public override void ExecuteCommand()
        {
            receiver.BakeMutton();
        }
    }
}

namespace CommandPattern
{
    //烤鸡翅命令
    class BakeChickenWingCommand : Command
    {
        public BakeChickenWingCommand(Barbecuer receiver)
            : base(receiver)
        {
        }
        public override void ExecuteCommand()
        {
            receiver.BakeChickenWing();
        }
    }
}

using System;
using System.Collections.Generic;

namespace CommandPattern
{
    //服务员
    public class Waiter
    {
        //增加存放具体命令的容器
        private IList<Command> orders = new List<Command>();

        //设置订单
        public void SetOrder(Command command)
        {
            if (command.ToString() == "CommandPattern.BakeChickenWingCommand")
            {
                Console.WriteLine("服务员:鸡翅没有了,请点别的烧烤.");
            }
            else
            {
                orders.Add(command);
                Console.WriteLine("增加订单:" + command.ToString() + " 时间:" + DateTime.Now.ToString());
            }
        }
        //取消订单
        public void CancelOrder(Command command)
        {
            orders.Remove(command);
            Console.WriteLine("取消订单:" + command.ToString() + " 时间:" + DateTime.Now.ToString());
        }
        //通知全部执行
        public void Notify()
        {
            foreach (Command cmd in orders)
            {
                cmd.ExecuteCommand();            }
        }
    }
}

using System;

namespace CommandPattern
{
    //烤肉串者
    public class Barbecuer
    {
        //烤羊串
        public void BakeMutton()
        {
            Console.WriteLine("烤羊肉串！");
        }
        public void BakeChickenWing()
        {
            Console.WriteLine("烤鸡翅！");
        }
    }
}

using System;

namespace CommandPattern
{
    class Program
    {
        static void Main(string[] args)
        {
            //开店前的准备
            Barbecuer boy = new Barbecuer();
            Command bakeMuttonCommand1 = new BakeMuttonCommand(boy);
            Command bakeMuttonCommand2 = new BakeMuttonCommand(boy);
            Command bakeChikenWingCommand1 = new BakeChickenWingCommand(boy);
            Waiter girl = new Waiter();
            //开门营业 顾客点菜
            girl.SetOrder(bakeMuttonCommand1);
            girl.SetOrder(bakeMuttonCommand2);
            girl.SetOrder(bakeChikenWingCommand1);
            //点菜完毕，通知厨房
            girl.Notify();

            Console.Read();
        }
    }
}