我正在写一个商业应用程序,并且遇到了一个令人沮丧的错误,它不告诉我实际的错误是什么。将购物车项目添加到数据库时出错
这是一个正在运行
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult AddToCart(int product_ID)
{
if (db.Products.Any(product => product.Product_ID == product_ID))
{
//var successfulAddToCart = false;
var cartItem = new Cart();
// cartItem.CartID = Guid.NewGuid();
if (Request.IsAuthenticated)
{
var Customer = db.Customers.FirstOrDefault(customer => customer.Email == User.Identity.Name);
cartItem.Customer = Customer;
cartItem.CustomerID = Customer.Customer_ID;
}
else//not logged in, need to remember them somehow
{
// add a cookie for a guest user so we can save their cart for some time.
var CartCookie = new HttpCookie("Cart", Guid.NewGuid().ToString());
CartCookie.Expires.AddDays(2);
Request.Cookies.Add(CartCookie);
cartItem.Customer = new Customer();
cartItem.CustomerID = null;
}
//obviously not checked out since we just added to cart
cartItem.IsCheckedOut = false;
cartItem.Quantity = 1;
//one to one with product, so grab the first sku you find.
var Sku = db.SKU_Table.SingleOrDefault(sku => sku.Product_ID == product_ID);
cartItem.Sku = Sku;
cartItem.SkuID = Sku.SKU_ID;
//if everything is okay, save the changes to the database
if (ModelState.IsValid)
{
db.Cart.Add(cartItem);
db.SaveChanges();
}
//return a content string that displays success or failure
return Content("Add to cart was successful");
}
return Content("Add to cart was not successful");//unsuccessful add
}
现在据我可以告诉代码,我的模型是非常有效的,我不知道是什么问题的来源是。如果这会有所帮助,我可以发布购物车项目对象的值。错误消息并没有真正的帮助,我没有看到我的模型状态有什么问题,尤其是在它传递之后。
这里是车模型
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Web;
namespace SeniorProjectMVC.Models
{
[Table("Cart")]
public class Cart
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ID { get; set; }
public Guid CartID { get; set; }
public int SkuID { get; set; }
public virtual Sku Sku { get; set; }
[Required]
public int Quantity { get; set; }
public int? CustomerID { get; set; }
public virtual Customer Customer { get; set; }
public bool IsCheckedOut { get; set; }
}
}
* RequiredAttribute属性指定当表单上的字段被验证时,该字段必须包含一个值。如果属性为空,包含空字符串(“”)或仅包含空格字符,则会引发验证异常。* ....请检查您的'else'这行代码中的内容'cartItem.CustomerID = null; '......改变它的类似'cartItem.CustomerID = 0;'看看它是否工作:) – Hackerman
我试过,并且该字段不需要在数据库中,因为它是一个可为空的整数。它在我的数据库中作为一个可空的int字段出来 – ddeamaral
检查'if(ModelState.IsValid)'是无意义的(你的模型是'int product_ID')并且它不需要设置'cartItem.Customer'和'cartItem.Sku'属性(只是相关的'CustomerID'和'SkuID'属性)。您没有为“CartID”设置一个值(您已注释掉该行),因此会引发异常。 –