//public void SetPayment(Payment payment)
//{
// if (OrderHasBeenPaidFor())
// {
// throw new Exception("已支付");
// }
// if (OrderTotalMatches(payment))
// {
// Payment = payment;
// }
// else
// {
// throw new Exception("支付金额错误");
// }
// _orderState.Submit(this);
//}
//public bool OrderHasBeenPaidFor()
//{
// return Payment !=null && OrderTotalMatches(Payment);
//}
public bool SystemLocker()
{
var lockered = _orderState.SystemLocker(this);
return(lockered);
}