保存我的實體時拋出EntityValidationException

Question

我在調試catch (Exception e)時收到了此消息。當用戶填寫所有信息時，Address and PaymentView將獲得SalesOrderID並重定向到完整視圖。但它完成後沒有顯示完成。

[HttpPost] 
     public ActionResult AddressAndPayment(SalesOrderHeader order,Customer customer, Address address ,FormCollection values) 
     { 
      ViewBag.PersonType = new SelectList(new[] { "EM", "SC", "VC", "IN" } // work 
                .Select(x => new { value = x, text = x }), 
                "value", "text"); 
      try 
      { 
       if (string.Equals(values["PromoCode"], PromoCode, StringComparison.OrdinalIgnoreCase) == false) 
       { 
        return View(order); 
       } 
       else 
       { 
        order.AccountNumber = User.Identity.Name; 
        order.OrderDate = DateTime.Now; 
        address.ModifiedDate = DateTime.Now; // maybe this error 
        order.Address.PostalCode = "12345"; 

        //Save Order 
        BikeDBs.SalesOrderHeaders.Add(order); 
        try 
        { 
         BikeDBs.SaveChanges(); 
        } 
        catch (DbEntityValidationException e) 
        { 
         foreach (var entityValidationErrors in e.EntityValidationErrors) 
         { 
          foreach (var validationError in entityValidationErrors.ValidationErrors) 
          { 
           Console.WriteLine("Properties: {0} Error: {1}", validationError.PropertyName, validationError.ErrorMessage); 
          } 
         } 
        } 
        //Process Order 
        var cart = ShoppingCart.GetCart(this.HttpContext); 
        cart.CreateOrder(order); 
        //cart.CreateOrder(order1); 
        return RedirectToAction("Complete", new { id = order.SalesOrderID }); 
       } 
      } 
      catch (Exception exception) 
      { 
       //Invalid - redisplay with errors 
       return View(order); 
      } 

所有我想要的是在保存的Order，它會重定向到Complete。但在這種情況下，事實並非如此。這裏是Address型號：

public partial class Address 
    { 
     public Address() 
     { 
      this.SalesOrderHeaders = new HashSet<SalesOrderHeader>(); 
      this.SalesOrderHeaders1 = new HashSet<SalesOrderHeader>(); 
     } 

     public int AddressID { get; set; } 
     public string AddressLine1 { get; set; } 
     public string AddressLine2 { get; set; } 
     public string City { get; set; } 
     public int StateProvinceID { get; set; } 
     public string PostalCode { get; set; } 
     public System.Guid rowguid { get; set; } 
     [Required()] 
     public Nullable<System.DateTime> ModifiedDate { get; set; } 

     public virtual StateProvince StateProvince { get; set; } 
     public virtual ICollection<SalesOrderHeader> SalesOrderHeaders { get; set; } 
     public virtual ICollection<SalesOrderHeader> SalesOrderHeaders1 { get; set; } 
    } 

什麼是解決方案，以及如何解決它？

Answer 1

你可以通過使用ModelState很容易地做到這一點，它應該抓住它。如果它沒有將代碼添加到catch塊中以捕獲它並使用ModelState.AddModelError再次顯示錯誤頁面。

[HttpPost] 
public ActionResult AddressAndPayment(SalesOrderHeader order,Customer customer, Address address ,FormCollection values) 
{ 
    ViewBag.PersonType = new SelectList(new[] { "EM", "SC", "VC", "IN" } // work 
               .Select(x => new { value = x, text = x }), 
               "value", "text"); 
    if(ModelState.IsValid) 
    { 
     try 
     { 
      if (string.Equals(values["PromoCode"], PromoCode, StringComparison.OrdinalIgnoreCase) == false) 
      { 
       return View(order); 
      } 
      else 
      { 
       order.AccountNumber = User.Identity.Name; 
       order.OrderDate = DateTime.Now; 
       order.Address.PostalCode = values["PostalCode"]; 

       //Save Order 
       BikeDBs.SalesOrderHeaders.Add(order); 
       try 
       { 
        BikeDBs.SaveChanges(); 
       } 
       catch (DbEntityValidationException e) 
       { 
        foreach (var entityValidationErrors in e.EntityValidationErrors) 
        { 
         foreach (var validationError in entityValidationErrors.ValidationErrors) 
         { 
          // If this far add errors to model errors and show view again. 
          ModelState.AddModelError(validationError.PropertyName, validationError.ErrorMessage); 
          Console.WriteLine("Properties: {0} Error: {1}", validationError.PropertyName, validationError.ErrorMessage); 
         } 
        } 
        return View(order); 
       } 
       //Process Order 
       var cart = ShoppingCart.GetCart(this.HttpContext); 
       cart.CreateOrder(order); 
       //cart.CreateOrder(order1); 
       return RedirectToAction("Complete", new { id = order.SalesOrderID }); 
      } 
     } 
     catch (Exception exception) 
     { 
      //Invalid - redisplay with errors 
      return View(order); 
     } 
    } 
    return View(order); 
} 

Answer 2

我的回答我假設性PostalCode和PersonType是string型的和被定義爲not nullable。

我認爲你得到的錯誤信息清楚地說明了問題所在。需要屬性PostalCode和PersonType，這意味着它們需要具有除null以外的其他值。

因此，當您不將屬性設置爲非null值並嘗試保存實體時，您將收到錯誤消息。

要修復它你會網的屬性設置爲某個值（可能是默認值），或者你必須改變你的EntityModel指定這些屬性nullable