C# 将ApplicationUser属性添加到模型时，Create ActionResult不起作用

我有问题已经20天了。在我的模型“Colocataires”中，有一个属性类型为ApplicationUser“Publisher”。这意味着一个托管的发布者就是他自己的用户。所以问题是ModelState始终为false，所以创建从未完成。 型号：

身份模型：

    public class ApplicationUser : IdentityUser
{
    [DisplayName("Nom"),Required]
    public string LastName { get; set; }

    [DisplayName("Prenom"), Required]
    public string FirstName { get; set; }

    [DisplayName("Sexe"), Required]
    public string Gender { get; set; }

    [DisplayName("Age"), Required]
    public int Age { get; set; }

    [DisplayName("Telephone"), Required]
    public string Tel { get; set; }


    public ICollection<OffreDeLocation> OffresLocation { get; set; }

    public ICollection<Colocataire> Colocatires { get; set; }

    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> 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;
    }
}

---

当我删除ApplicationUser属性时，它工作正常，因此我不知道我缺少了什么，请帮助

缺少一个必填字段。在“ModelState.IsValid”上放置一个断点，然后深入研究its键。其中一个选项具有键和值。该值将告诉您错误是什么。请参见：

    public class ApplicationUser : IdentityUser
{
    [DisplayName("Nom"),Required]
    public string LastName { get; set; }

    [DisplayName("Prenom"), Required]
    public string FirstName { get; set; }

    [DisplayName("Sexe"), Required]
    public string Gender { get; set; }

    [DisplayName("Age"), Required]
    public int Age { get; set; }

    [DisplayName("Telephone"), Required]
    public string Tel { get; set; }


    public ICollection<OffreDeLocation> OffresLocation { get; set; }

    public ICollection<Colocataire> Colocatires { get; set; }

    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> 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;
    }
}

        [HttpPost]
    [ValidateAntiForgeryToken]
    [Route("Create")]
    public ActionResult Create(Colocataire colocataire, HttpPostedFileBase upload)
    {
        ViewBag.currentUser = User.Identity.GetUserName();
        if (ModelState.IsValid)
        {
            string path = Path.Combine(Server.MapPath("~/Uploads/Colocataires"), upload.FileName);
            upload.SaveAs(path);
            colocataire.PhotoColoc = upload.FileName;
            colocataire.DateDajout = DateTime.UtcNow;
            db.Colocataires.Add(colocataire);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        return View(colocataire);
    }