將一個請求封裝爲一個對象,從而使你可用不同的請求對客戶進行參數化,對請求排隊或記錄請求日誌,以及支持可撤銷的操作。
using System;
using System.Collections.Generic;
using System.Text;
namespace 命令模式
{
class Program
{
static void Main(string[] args)
{
//開店前的準備
Barbecuer boy = new Barbecuer();
Command bakeMuttonCommand1 = new BakeMuttonCommand(boy);
Command bakeMuttonCommand2 = new BakeMuttonCommand(boy);
Command bakeChickenWingCommand1 = new BakeChickenWingCommand(boy);
Waiter girl = new Waiter();
//開門營業 顧客點菜
girl.SetOrder(bakeMuttonCommand1);
girl.SetOrder(bakeMuttonCommand2);
girl.SetOrder(bakeChickenWingCommand1);
//點菜完閉,通知廚房
girl.Notify();
Console.Read();
}
}
//服務員
public class Waiter
{
private IList<Command> orders = new List<Command>();
//設置訂單
public void SetOrder(Command command)
{
if (command.ToString() == "命令模式.BakeChickenWingCommand")
{
Console.WriteLine("服務員:雞翅沒有了,請點別的燒烤。");
}
else
{
orders.Add(command);
Console.WriteLine("增加訂單:" + command.ToString() + " 時間:" + DateTime.Now.ToString());
}
}
//取消訂單
public void CancelOrder(Command command)
{
orders.Remove(command);
Console.WriteLine("取消訂單:" + command.ToString() + " 時間:" + DateTime.Now.ToString());
}
//通知全部執行
public void Notify()
{
foreach (Command cmd in orders)
{
cmd.ExcuteCommand();
}
}
}
//抽象命令
public abstract class Command
{
protected Barbecuer receiver;
public Command(Barbecuer receiver)
{
this.receiver = receiver;
}
//執行命令
abstract public void ExcuteCommand();
}
//烤羊肉串命令
class BakeMuttonCommand : Command
{
public BakeMuttonCommand(Barbecuer receiver)
: base(receiver)
{ }
public override void ExcuteCommand()
{
receiver.BakeMutton();
}
}
//烤雞翅命令
class BakeChickenWingCommand : Command
{
public BakeChickenWingCommand(Barbecuer receiver)
: base(receiver)
{ }
public override void ExcuteCommand()
{
receiver.BakeChickenWing();
}
}
//烤肉串者
public class Barbecuer
{
public void BakeMutton()
{
Console.WriteLine("烤羊肉串!");
}
public void BakeChickenWing()
{
Console.WriteLine("烤雞翅!");
}
}
}