//添加依赖，利用对应的商品初始化订单明细
public OrderDetail(Good good, int goodNum)
{
this.GoodName = good.Name;
this.GoodPrice = good.Price;
this.GoodNum = goodNum;
}
public OrderDetail(String Id, Good GoodItem, int Num)
{
this.Id = Id;
this.GoodItem = GoodItem;
this.Num = Num;
}
