枚举产生在EF ASP.Net MVC3没有结果错误剃刀

Question

在我的ASP.Net MVC3剃刀的项目，我必须实现客户registration.When保存数据，返回该

“枚举没有结果”的错误

。这个错误是什么意思？以及如何解决这个问题？

控制器代码

[HttpPost] 
     public ActionResult CustomerRegistration(CustomerViewModel cusmodel) 
     { 

      StringBuilder sb = new StringBuilder(); 

       if (cusmodel.CarrerPlanning) 
       sb.Append("Career Planning"); 
      if (cusmodel.Personal) 
       sb.Append("Personal"); 
      if (cusmodel.Relationship) 
       sb.Append("Parenting"); 
      if (cusmodel.ActivityPlan) 
       sb.Append("Activity Plan for Childern"); 
      if (cusmodel.Stress) 
       sb.Append("Stress Management"); 
      cusmodel.Purpose = sb.ToString(); 

      try 
      { 
       var errors = ModelState.Values.SelectMany(v => v.Errors); 
       if (ModelState.IsValid) 
       { 
        cus.CusModelData.Add(cusmodel); 
        cus.SaveChanges(); 
        return RedirectToAction("ShowSuccess", "Home"); 

       } 
       return View(); 

      } 
      catch (Exception ex) 
      { 
       return View(ex.Message.ToString()); 
      } 




     } 

客户视图模型

public class CustomerViewModel 
    { 
     [Key] 
     public int CusId { get; set; } 
     [Required(ErrorMessage="First Name is required")] 
     public string Name { get; set; } 
     [Required(ErrorMessage="Age is required")] 
     [Range(0, int.MaxValue, ErrorMessage = "Please enter valid Age ")] 
     public int age { get; set; } 
     [Required(ErrorMessage = "Gender is required")] 
     public string Gender { get; set; } 
     public string FathName { get; set; } 
     public string MothName { get; set; } 
     public string OrgSchooName { get; set; } 
     public string Address { get; set; } 
     public string city { get; set; } 
     public string State { get; set; } 
     public string PIN { get; set; } 
     public string tele { get; set; } 
     public string Mob { get; set; } 
     public string Email { get; set; } 
     public string Web { get; set; } 
     public string Purpose { get; set; } 
     public string brief { get; set; } 

     public int Id { get; set; } 
     public bool IsChecked { get; set; } 


     public bool CarrerPlanning { get; set; } 
     public bool Personal { get; set; } 
     public bool Relationship { get; set; } 
     public bool Parenting { get; set; } 
     public bool ActivityPlan { get; set; } 
     public bool Stress { get; set; } 

     public DateTime RegistrationDate { get; set; } 

     //public IList<CustomerViewModel> CheckBoxItems { get; set; } 
     //public IEnumerable<string> CheckBoxItemsValue { get; set; } 

    } 
} 

Answer 1

这可能是因为现代从ModelState中错误LINQ选择。您是否可以将其包装在一张支票中以确保ModelState中实际上有任何值：

if(ModelState.Values.Count()>0) { 
    var errors = ModelState.Values.SelectMany(v => v.Errors); 

} else { 
    if (ModelState.IsValid) 
    { 
     cus.CusModelData.Add(cusmodel); 
     cus.SaveChanges(); 
     return RedirectToAction("ShowSuccess", "Home"); 
    } 
    return View(); 
}