mvcmusicstore v2.0里的CreateOrder方法是有错误的

本文链接：https://blog.youkuaiyun.com/luanshaofeng/article/details/6279226

本文介绍了一个电子商务应用中CreateOrder方法的修正过程。修正前的方法未能正确保存订单详情及更新订单总额，通过改进代码实现了从购物车获取商品详情、计算订单总额并成功保存至数据库。

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这个下边是错误的CreateOrder方法,order不是从storeDb取出的，所以后边的storeDb.Save,对这个Order不起作用（或许将来会），后边的orderDetails只是循环了一下，并没用AddToData.

public int CreateOrder(Order order) { decimal orderTotal = 0; var cartItems = GetCartItems(); // Iterate over the items in the cart, adding the order details for each foreach (var item in cartItems) { var orderDetails = new OrderDetail { AlbumId = item.AlbumId, OrderId = order.OrderId, UnitPrice = item.Album.Price, Quantity = item.Count }; // Set the order total of the shopping cart orderTotal += (item.Count * item.Album.Price); } // Set the order's total to the orderTotal count order.Total = orderTotal; // Save the order storeDB.SaveChanges(); // Empty the shopping cart EmptyCart(); // Return the OrderId as the confirmation number return order.OrderId; }

这里是修改后的代码

public int CreateOrder(Order order) { decimal orderTotal = 0; //实例化一个order var o = storeDB.Orders.Single(i => i.OrderId == order.OrderId); var cartItems = GetCartItems(); // Iterate over the items in the cart, adding the order details for each foreach (var item in cartItems) { var orderDetails = new OrderDetail { ProductId = item.ProductId, OrderId = order.OrderId, UnitPrice = item.Product.Price, Quantity = item.Count }; //添加一条orderDetails storeDB.OrderDetails.Add(orderDetails); // Set the order total of the shopping cart orderTotal += (item.Count * item.Product.Price); } // Set the order's total to the orderTotal count o.Total = orderTotal; // Save the order storeDB.SaveChanges(); // Empty the shopping cart EmptyCart(); // Return the OrderId as the confirmation number return order.OrderId; }