从 ApplicationUser 继承返回 null

Question

我不确定我的类模型或 RegisterIvestor.cs 是否存在问题 我的 Investor.cs 属性均未保存并返回空值。

我正在尝试为不同类型的用户创建不同的登录。我希望所有用户都保存到 ApplicationUser。我发现下面的代码构建和迁移发现只是得到空数据。

ApplicationDBContext.cs

public class ApplicationDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, string, IdentityUserClaim<string>,
ApplicationUserRole, IdentityUserLogin<string>,
IdentityRoleClaim<string>, IdentityUserToken<string>>

{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
       : base(options)
    {
    }


    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);

        builder.Entity<ApplicationUser>()
          .HasOne(p => p.Investor)
          .WithOne(b => b.ApplicationUser)
          .HasForeignKey<Investor>(b => b.InvestorForeignKeyID);

    }
    public DbSet<ApplicationUser> ApplicationUser { get; set; }
    public DbSet<Investor> Investor { get; set; }
}

RegisterInvestor.cshtml.cs

        public async Task<IActionResult> OnPostAsync(string returnUrl = null)
        {
        if (ModelState.IsValid)
        {
            var user = new ApplicationUser()
            {
                UserName = Input.Email,
                Email = Input.Email,
                FirstName = Input.FirstName,
                LastName = Input.LastName,
                Address = Input.Address,
                City = Input.City,
                State = Input.State,
                Zip = Input.Zip

                Investor = new Investor()
                {
                        SsnTaxId = Input.SsnTaxId,
                        DOB = Input.DOB,
                        DriverClass = Input.DriverClass,
                        LicenseNumber = Input.LicenseNumber                      
                }

            };
        }
        }

ApplicationUser.cs

 public class ApplicationUser : IdentityUser
{
    public virtual Investor  Investor { get; set; }
    //other properties
 }

Investor.cs

 public class Investor : ApplicationUser
{

    [Required]
    [Display(Name = "SSN or TaxID")]
    public string SsnTaxId { get; set; }
    [Display(Name = "Date of Birth")]
    public DateTime DOB { get; set; }


    public string InvestorForeignKeyID { get; set; }

    [ForeignKey("InvestorForeignKeyID")]
    public virtual ApplicationUser ApplicationUser { get; set; }
}

显示数据

@Html.DisplayFor(m => Model.FirstName)
@Html.DisplayFor(m => m.Investor.SsnTaxId)

Answer 1

首先，您不应该实例化具有相同名称的类的东西，这是令人困惑和不好的做法：

public virtual Investor UserInvestor { get; set; }

至于 Invertor 为空，如果您在视图中使用循环，则有可能因为您在 ApplicationUser 中实例化对象，然后它们都为空，请尝试以下操作：

public async Task<IActionResult> OnPostAsync(string returnUrl = null)
   {

        UserInvestor = new Investor();
        if (ModelState.IsValid)
        {
            var user = new ApplicationUser()
            {
                UserName = Input.Email,
                Email = Input.Email,
                FirstName = Input.FirstName,
                LastName = Input.LastName,
                Address = Input.Address,
                City = Input.City,
                State = Input.State,
                Zip = Input.Zip

                UserInvestor.SsnTaxId = Input.SsnTaxId,
                UserInvestor.DOB = Input.DOB,
                UserInvestor.DriverClass = Input.DriverClass,
                UserInvestor.LicenseNumber = Input.LicenseNumber                      
                }

            };
        }
   }

还要在视图中显示 FirstName，如下所示：

@Model.FirstName

或

@Html.DisplayFor(m => m.FirstName)