C# ASP.NET Identity在用户表中为1个用户创建2行

我正在ASP.NET MVC#中创建一个应用程序。我已经选择了Invidual用户帐户选项并安装了Identity软件包。我在AccountController中配置了注册和登录功能，以执行一些额外的操作。我添加了在用户注册时添加角色的功能，如

UserManager.AddToRole（user.Id，Student）

所示。我还将其设置为，它会自动在用户表中创建一个新行来存储信息

注册：

        [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> Register(RegisterViewModel model)
    {
        if (ModelState.IsValid)
        {
            var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
            var result = await UserManager.CreateAsync(user, model.Password);
            if (result.Succeeded)
            {
                await SignInManager.SignInAsync(user, isPersistent:false, rememberBrowser:false);
                UserManager.AddToRole(user.Id, "Student");  //Will automatically add users as students once registered
                Service.IService Service = new Service.Service();
                Data.User newUser = new Data.User
                {
                    UserId = user.Id,
                    Username = model.Name,
                    Email = model.Email
                };  //Will insert a new row in the User class with the attributes listed
                Service.AddUser(newUser);
                Session.Add("UserId", user.Id);  //Adds User to the session
                // For more information on how to enable account confirmation and password reset please visit https://go.microsoft.com/fwlink/?LinkID=320771
                // Send an email with this link
                // string code = await UserManager.GenerateEmailConfirmationTokenAsync(user.Id);
                // var callbackUrl = Url.Action("ConfirmEmail", "Account", new { userId = user.Id, code = code }, protocol: Request.Url.Scheme);
                // await UserManager.SendEmailAsync(user.Id, "Confirm your account", "Please confirm your account by clicking <a href=\"" + callbackUrl + "\">here</a>");

                return RedirectToAction("AddUser", "Home");
            }
            AddErrors(result);
        }

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

       [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> Login(LoginViewModel model, string returnUrl)
    {
        if (!ModelState.IsValid)
        {
            return View(model);
        }

        // This doesn't count login failures towards account lockout
        // To enable password failures to trigger account lockout, change to shouldLockout: true
        var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, shouldLockout: false);
        switch (result)
        {
            case SignInStatus.Success:
                Service.IService Service =
                    new Service.Service();
                Data.User loginUser = Service.GetUserEmail(model.Email);
                Session.Add("UserId", loginUser.UserId); 
                var um = new UserManager<ApplicationUser>(
                    new Microsoft.AspNet.Identity.EntityFramework.UserStore<ApplicationUser>(new ApplicationDbContext()));
                IList<string> roles = um.GetRoles(loginUser.UserId);
                Session.Add("Roles", roles);
                return RedirectToAction("GetUser", "Home", new { id = loginUser.UserId });
            case SignInStatus.LockedOut:
                return View("Lockout");
            case SignInStatus.RequiresVerification:
                return RedirectToAction("SendCode", new { ReturnUrl = returnUrl, RememberMe = model.RememberMe });
            case SignInStatus.Failure:
            default:
                ModelState.AddModelError("", "Invalid login attempt.");
                return View(model);
        }
    }

        public User GetUserEmail(string email, MyContext context) //Retrieves user information by querying both tables to find matching rows
    {
        IQueryable<User> user = from u in context.Users where u.Email == email select u;
        return user.ToList().First();
    }

当我查看用户表时，每个用户有2行。第一行包含他们在注册时创建的用户标识，然后是另一行，其中包含从Identity创建的哈希用户标识。这就是它崩溃的地方，它试图检索错误的用户ID。我有一个运行良好的应用程序，只在用户表中插入1行，为什么会发生这种情况

---

在

寄存器

操作中，此行创建一个用户：

var result = await UserManager.CreateAsync(user, model.Password);

然后在下面再次插入用户：

Service.AddUser(newUser);

如果您想在用户插入数据库后更新该用户，假设您使用的是

实体框架

，那么您应该能够使用

上下文。更新（用户）而是创建一个
newUser
对象并添加它。然后调用
context.saveChangesSync（）

如果它不是实体框架，并且是一个自定义服务，具有您自己的数据库读写方法，那么只需从数据库中获取用户对象，更新值，并调用您的更新方法。
您已经使用UserManager CreateAncy方法创建了用户，那么为什么要再次使用service.AddUser（newUser）添加用户？