无法将嵌套对象保存在实体框架中

Question

我是Asp.Net MVC的新手。 我在我的项目中使用了标准会员资格提供程序。 我有应用程序用户和ApplicationDbContext

  public class ApplicationUser : IdentityUser
    {
    [Required]
        public virtual UserInfo UserInfo { get; set; }
        public virtual ICollection<Lot> Lots { get; set; }
    }

    public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
    {
        public DbSet<Lot> Lots { get; set; }
        public DbSet<Product> Products { get; set; }

        public DbSet<UserInfo> UserInfoes { get; set; }

        public DbSet<PersonalInformation> PersonalInformations { get; set; } 
        public ApplicationDbContext()
            : base("DefaultConnection")
        {
        }
    }

和UserInfo

public class UserInfo
    {
        [Key]
        public int UserInfoId { get; set; }
        public DateTime RegistarationDate { get; set; }
        public decimal Money { get; set; }
        public decimal CurrentDebt { get; set; }
        public virtual PersonalInformation PersonalInformation { get; set; }
        public virtual ApplicationUser ApplicationUser { get; set; }
    }

个人信息

 public class PersonalInformation
    {
        public int PersonalInformationId { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Telephone { get; set; }
        public Adress Adress { get; set; }
    }

我的RegisterViewModel

public class RegisterViewModel
    {
        [Required]
        [Display(Name = "User name")]
        public string UserName { get; set; }

        [Required]
        [StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 6)]
        [DataType(DataType.Password)]
        [Display(Name = "Password")]
        public string Password { get; set; }

        [DataType(DataType.Password)]
        [Display(Name = "Confirm password")]
        [Compare("Password", ErrorMessage = "The password and confirmation password do not match.")]
        public string ConfirmPassword { get; set; }

        public string FirstName { get; set; }
        public string LastName { get; set; }
        public decimal Money { get; set; }

        public string Telephone { get; set; }
    }

和动作在控制器中创建

 [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> Register(RegisterViewModel model)
        {
            if (ModelState.IsValid)
            {
                var user = new ApplicationUser()
                {
                    UserName = model.UserName,
                    UserInfo = new UserInfo()
                    {
                        CurrentDebt = 0,
                        Money = model.Money,
                        RegistarationDate = DateTime.Now,
                        PersonalInformation = new PersonalInformation()
                        {
                            FirstName = model.FirstName,
                            LastName = model.LastName,
                            Telephone = model.Telephone,
                        }
                    }
                };
                var result = await UserManager.CreateAsync(user, model.Password);
                if (result.Succeeded)
                {
                    await SignInAsync(user, isPersistent: false);
                    return RedirectToAction("Index", "Home");
                }
                else
                {
                    AddErrors(result);
                }
            }

            // If we got this far, something failed, redisplay form
            return View(model);
        }

当我填写行动中提到的所有字段时，我收到此错误

无法将值NULL插入表'DefaultConnection.dbo.UserInfoes'的'UserInfoId'列中； 列不允许为空。 INSERT失败。 该语句已终止。

有人可以帮我吗？ 非常感谢

Answer 1

您需要告诉EF UserInfoId是针对该表的Key ，因此它将其映射为Identity 。

这样的事情将在映射文件中起作用：

public class UserInfoMap : EntityTypeConfiguration<UserInfo>
{
    public UserInfoMap()
    {
        ToTable("UserInfo");
        HasKey(m => m.UserInfoId );
    }
}

当代码首次迁移运行时，它会生成如下内容：

CreateTable(
    "dbo.UserInfo",
    c => new
        {
            UserInfoId = c.Int(nullable: false, identity: true)
)

这意味着您无需指定ID，因为它会自动填充到数据库中。