基础才是重中之重~何为原子化操作

     　　　　　using (TransactionScope scope = new TransactionScope())
                {
                    var list = _context.Order.Include("OrderItem")
                        .Where(x => x.ID == order.ID);
                    if (list.Count() > 0)
                    {
                        //更新Order列
                        Order _order = list.First();
                        _order.Count = order.Count;
                        _order.Delivery = order.Delivery;
                        _order.Favorable = order.Favorable;
                        _order.Freightage = order.Freightage;
                        _order.OrderNumber = order.OrderNumber;
                        _order.PersonID = order.PersonID;
                        _order.Price = order.Price;
                        _order.TotalPrice = order.TotalPrice;

                        //删除原有的订单明细项OrderItem
                        if (list.First().OrderItem.Count != 0)
                            foreach (var item in list.First().OrderItem)
                                DeleteOrderItem(item.ID);
                        //加入新的订单明细项OrderItem
                        if (order.OrderItem.Count != 0)
                        {
                            foreach (var item in order.OrderItem)
                            {
                                var _orderItem = new OrderItem();
                                _orderItem.Count = item.Count;
                                _orderItem.Goods = item.Goods;
                                _orderItem.OrderID = item.OrderID;
                                _orderItem.Price = item.Price;
                                AddOrderItem(_orderItem);
                            }
                        }
                        returnValue = _context.SaveChanges();
                    }
                    else
                        returnValue = 0;

                    scope.Complete();
                }
            }