C# 使用ApplicationUser从另一个表获取值总是空的

我试图使用应用程序用户访问

Docente

表，但“User.Docente”的返回值总是

null

ApplicationUser.cs

public class ApplicationUser : IdentityUser
{
    public virtual Docente Docente { get; set; }
}

Docente.cs

public class Docente
{
    public int DocenteId { get; set; }
    public string Nome { get; set; }
    public string Imagem { get; set; }
    public int DepartamentoId { get; set; }
    public string UserId { get; set; }

    public virtual ApplicationUser ApplicationUser { get; set; }
}

    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Login(LoginViewModel model, string returnUrl = null)
    {
        ViewData["ReturnUrl"] = returnUrl;


        ApplicationUser user = null;
        user = _context.ApplicationUser.Single(u => u.Email.Equals(model.Email));


        var getuserId = user.Docente.DepartamentoId;

AccountController.cs

public class Docente
{
    public int DocenteId { get; set; }
    public string Nome { get; set; }
    public string Imagem { get; set; }
    public int DepartamentoId { get; set; }
    public string UserId { get; set; }

    public virtual ApplicationUser ApplicationUser { get; set; }
}

    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Login(LoginViewModel model, string returnUrl = null)
    {
        ViewData["ReturnUrl"] = returnUrl;


        ApplicationUser user = null;
        user = _context.ApplicationUser.Single(u => u.Email.Equals(model.Email));


        var getuserId = user.Docente.DepartamentoId;

[HttpPost]
[异名]
[ValidateAntiForgeryToken]
公共异步任务登录（LoginViewModel模型，字符串returnUrl=null）
{
ViewData[“ReturnUrl”]=ReturnUrl；
ApplicationUser用户=null；
user=_context.ApplicationUser.Single（u=>u.Email.Equals（model.Email））；
var getuserId=user.Docente.departmentoid；

我不确定是否出于某种原因关闭了延迟加载，因此我建议您尝试手动包含

Docente

导航属性：

user = _context.ApplicationUser
               .Include(u => u.Docente) // this requires System.Data.Entity namespace
               .Single(u => u.Email.Equals(model.Email));

---

我不确定是否出于某种原因关闭了延迟加载，因此我建议您尝试手动包含

Docente

导航属性：

user = _context.ApplicationUser
               .Include(u => u.Docente) // this requires System.Data.Entity namespace
               .Single(u => u.Email.Equals(model.Email));