public void SetOrder(CommandDemo command)
{
if (command.ToString() == "Demo.BakeChickenCommand")
{
Console.WriteLine("服务员：没有鸡翅！");
}
else
{
orders.Add(command);
Console.WriteLine("增加订单：" + command.ToString() + " 时间：" + DateTime.Now.ToString());
}
}
public void CancelOrder(CommandDemo command)
{
orders.Remove(command);
Console.WriteLine("取消订单：" + command.ToString() + " 时间：" + DateTime.Now.ToString());
}