突然从实体框架中获取异常

Question

我不时收到此异常：

“用户”上的“电子邮件”属性无法设置为“System.Int64”值。您必须将此属性设置为“System.String”类型的非空值。方法消息:, LogException: System.InvalidOperationException: 'User' 上的 'Email' 属性无法设置为 'System.Int64' 值。您必须将此属性设置为“System.String”类型的非空值。在 System.Data.Entity.Core.Common.Internal.Materialization.Shaper.ErrorHandlingValueReader 1.GetValue(DbDataReader reader, Int32 ordinal) at lambda_method(Closure , Shaper ) at System.Data.Entity.Core.Common.Internal.Materialization.Shaper.HandleEntityAppendOnly[TEntity](Func2constructEntityDelegate, EntityKey entityKey, EntitySet entitySet) 在 lambda_method(Closure , Shaper ) 在 System.Data.Entity.Core.Common.Internal.Materialization.Coordinator 1.ReadNextElement(Shaper shaper) at System.Data.Entity.Core.Common.Internal.Materialization.Shaper1.SimpleEnumerator.MoveNext() at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) at Project。

我在 MVC 项目中使用 Asp.net Identity。

我的用户类像：

public class User : IdentityUser<long, IdentityConfig.UserLogin, IdentityConfig.UserRole, IdentityConfig.UserClaim>
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(IdentityConfig.CustomUserManager manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);

        // Add custom user claims here
        return userIdentity;
    }

    [MaxLength(256)]
    [Index(IsUnique = true)]
    [Required]
    public override string Email { get; set; }

    [Required]
    [MaxLength(256)]
    public string FirstName { get; set; }

      // rest of properties
    ....
}

用户经理：

public class CustomUserManager : UserManager<User, long>
    {
        public CustomUserManager(IUserStore<User, long> store, IdentityFactoryOptions<CustomUserManager> options) : base(store)
        {
            this.UserValidator = new UserValidator<User, long>(this)
            {
                AllowOnlyAlphanumericUserNames = false,
                RequireUniqueEmail = true
            };

            // Configure validation logic for passwords
            PasswordValidator = new PasswordValidator
            {
                RequiredLength = 8,
                RequireLowercase = true,
                RequireUppercase = true,
                RequireDigit = true
            };

            // Configure user lockout defaults
            UserLockoutEnabledByDefault = true;
            DefaultAccountLockoutTimeSpan = TimeSpan.FromMinutes(5);
            MaxFailedAccessAttemptsBeforeLockout = 5;

            // Register two factor authentication providers. This application uses Phone and Emails as a step of receiving a code for verifying the user
            // You can write your own provider and plug it in here.
            RegisterTwoFactorProvider("Google Authentication", new GoogleAuthenticatorTokenProvider());

            var provider = new MachineKeyProtectionProvider();
            UserTokenProvider = new DataProtectorTokenProvider<User,long>(provider.Create("ResetPasswordPurpose"));

        }
    }

用户服务：

public class UserService : EntityService<User>, IUserService
   {
    private readonly IdentityConfig.CustomUserManager _userManager;

    public UserService(MyDbContext context, IdentityConfig.CustomUserManager userManager) : base(context)
    {
        _userManager = userManager;
    }

   public User FindById(long userId)
    {
        return _userManager.Users.FirstOrDefault(x => x.Id == userId);
    }

// other methods..
}

注册 Autofac：

        builder.RegisterModule(new ServiceModule());
        builder.RegisterModule(new EfModule());

        builder.RegisterType<IdentityConfig.RoleStore>().As<IRoleStore<IdentityConfig.Role, long>>().InstancePerRequest();
        builder.RegisterType<IdentityConfig.CustomUserStore>().As<IUserStore<User, long>>().InstancePerRequest();
        builder.RegisterType<IdentityConfig.CustomUserManager>().AsSelf().InstancePerRequest();
        builder.RegisterType<IdentityConfig.CustomSignInManager>().AsSelf().InstancePerRequest();
        builder.RegisterType<IdentityConfig.CustomRoleManager>().AsSelf().InstancePerRequest();

        builder.Register<IAuthenticationManager>(c => HttpContext.Current.GetOwinContext().Authentication);


        builder.Register(c => new IdentityFactoryOptions<IdentityConfig.CustomUserManager>
        {
            DataProtectionProvider = new DpapiDataProtectionProvider("MyWebAppName"),
            Provider = new IdentityFactoryProvider<IdentityConfig.CustomUserManager>()
        }).InstancePerRequest();



public class ServiceModule : Module
{
    protected override void Load(ContainerBuilder builder)
    {
        builder.RegisterAssemblyTypes(Assembly.Load("Project.Services"))

                 .Where(t => t.Name.EndsWith("Service") || t.Name.EndsWith("Validator"))
                 .AsImplementedInterfaces()
                 .InstancePerLifetimeScope();
    }
}


 public class EfModule : Module
{
    protected override void Load(ContainerBuilder builder)
    {
        builder.RegisterType(typeof(MyDbContext)).AsSelf().WithParameter("connectionString", ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString).InstancePerRequest();
    }
}

我还注意到这个错误不仅影响用户，还会影响其他一些实体！

问题是应用程序运行了一段时间，然后给出了太多这种错误，这对我来说没有任何意义，让我很生气。

我正在使用 Azure SQL、Azure Web 服务、Autofac。

Answer 1

这里同样的问题。它发生在中等到高需求时。我不知道该怎么办了。我每天回收 5 次。

我找不到任何标准。异常会在许多不同的方法中抛出。没有标准。看起来完全随机。

看来我正在尝试检索数据库上的信息，并且它总是返回空白数据，因此当它尝试将空数据转换为模型时会引发错误。