System.Data.Entity.Validation.DbEntityValidationException：'一个或多个实体的验证失败

Question

向数据库插入数据的问题：

例如：goods.GoodPhoto = "/Content/img/imageGood/"+imageName; 替换成这个：goods.GoodPhoto=""+imageName; 并且成功了。

    [HttpPost]
    public ActionResult AddGoods(Good goods)
            {
                HttpPostedFileBase image = Request.Files["image"];
                string SavePath = Server.MapPath("~/Content/img/imageGood/");
                string imageName = DateTime.Now.ToFileTime().ToString()+image.FileName;
                image.SaveAs(Path.Combine(SavePath, imageName));
                goods.GoodPhoto = "/Content/img/imageGood/"+imageName;
                goods.ShopID = Convert.ToInt32(Session["ShopID"]);
                db.Goods.Add(goods);
                db.SaveChanges();
                return RedirectToAction("Index", "Home");
            }

一旦我编码“goods.GoodPhoto = "/Content/img/imageGood/"+imageName;”然后它失败了。错误信息是：

System.Data.Entity.Validation.DbEntityValidationException: '验证 一个或多个实体失败。有关详细信息，请参阅 EntityValidationErrors 属性。 '

Answer 1

添加 try catch 以查找确切的错误消息

try
  {
     db.SaveChanges();                  

   }
 catch (DbEntityValidationException e)
 {
 foreach (var valErrors in e.EntityValidationErrors)
       {
         foreach (var errors in valErrors.ValidationErrors)
          {
            //here you will get property name and error message
                Trace.TraceInformation("Property: {0} Error: {1}", 
                                errors .PropertyName, 
                                errors .ErrorMessage);
          }                  

       }
   throw;                 
  }