c# – EntityFramework.dll中出现’System.Data.Entity.Validation.DbEntityValidationException’类型的第一次机会异常

2023年12月5日 410次阅读

执行此代码时收到此错误：

[HttpPost]
        public ActionResult Registration(UserModel user)
        {
            Console.WriteLine("ja");
            try
            {

                if (ModelState.IsValid)
                {
                    var crypto = new SimpleCrypto.PBKDF2();
                    var encrpPass = crypto.Compute(user.Password);
                    UserModel newUser = new UserModel(user.Email, encrpPass);
                    newUser.PasswordSalt = crypto.Salt;

                    userRepository.Add(newUser);
                    userRepository.SaveChanges();

                    return RedirectToAction("Index", "Home");
                }
            }
            catch (System.Data.Entity.Validation.DbEntityValidationException ex)
            {

                    Console.WriteLine(ex);
            }


            return View(user);
        }

UserModel类：

public class UserModel
    {
        public int UserModelId { get; set; }
        [Required]
        [EmailAddress]
        [StringLength(150)]
        [Display(Name="Email address: ")]
        public String Email { get; set; }
        [Required]
        [DataType(DataType.Password)]
        [StringLength(20, MinimumLength = 6)]
        [Display(Name = "Password: ")]
        public String Password { get; set; }
        public String PasswordSalt { get; set; }

        public UserModel(String email, String password)
        {
            this.Email = email;
            this.Password = password;
        }

        public UserModel()
        {
        }
    }

关于例外的更多细节：

Message “OriginalValues cannot be used for entities in the Added
state.” string

堆栈跟踪：

StackTrace ” bij
System.Data.Entity.Internal.InternalContext.SaveChanges()\r\n bij
System.Data.Entity.Internal.LazyInternalContext.SaveChanges()\r\n
bij System.Data.Entity.DbContext.SaveChanges()\r\n bij
SoccerManager1.Models.DAL.UserRepository.SaveChanges() in
d:\Stijn\Documenten\Visual Studio
2013\Projects\SoccerManager1\SoccerManager1\Models\DAL\UserRepository.cs:regel
48\r\n bij
SoccerManager1.Controllers.UserController.Registration(UserModel user)
in d:\Stijn\Documenten\Visual Studio
2013\Projects\SoccerManager1\SoccerManager1\Controllers\UserController.cs:regel
72″ string

我只是想创建一个注册页面,我不明白我收到此错误的原因.

我在这做错了什么？如果这不是我提供的信息,请告诉我.

最佳答案 您的某个属性值的验证可能失败.可能是您将“StringLength”设置为20并且您正在插入加密密码的密码.或者可能没有为某些非空字段传递值.

为了调试和查找实际原因,您可以在catch中使用以下代码块：

catch (System.Data.Entity.Validation.DbEntityValidationException ex)
{
    foreach (var validationErrors in ex.EntityValidationErrors)
    {
        foreach (var validationError in validationErrors.ValidationErrors)
        {
            Console.WriteLine("Property: {0} throws Error: {1}", validationError.PropertyName, validationError.ErrorMessage);
        }
    }
}
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