如何更改 UserManager 逻辑，以便用户在注册之前必须存在于数据库中

Question

我正在自定义 MVC5 注册过程，这样当用户注册时，他们必须输入两个自定义字段 'MyNewField1' 和 'MyNewField2'，然后将根据用户上下文检查它们以确保它们是否存在于在这种情况下，可以通过更新当前用户来成功注册。

 public async Task<ActionResult> CustomRegister(CustomRegisterViewModel model)
  {
        if (ModelState.IsValid)
        {                
            var context = new ApplicationDbContext();
            ApplicationUser user = context.Users.Where(a => a.MyNewField1== model.MyNewField1& a.MyNewField2== a.MyNewField2).SingleOrDefault();

            if(user != null)
            {
                var emailCheck = await UserManager.FindByNameAsync(model.Email);

                if (emailCheck == null)
                {
                    //We have found a user and email address has not been already assigned to another
                    //assign the email entered for this user in place of the username and email place
                    //holders and update the user before saving to the database
                    user.UserName = model.Email;
                    user.Email = model.Email;
                    var hasher = new PasswordHasher();
                    user.PasswordHash = hasher.HashPassword(model.Password);
                    context.SaveChanges();

                    var 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, "Budget Energy Email Verification", "Please confirm your account by clicking this link: <a href=\"" + callbackUrl + "\">link</a>");
                    ViewBag.Link = callbackUrl;

                    ViewBag.Message = "Check your email and confirm your account, you must be confirmed before you can log in.";
                    return View("Info");

                }
                else
                {
                    //This email address is already assigned to a user
                    return View(model);
                }
            }
            else
            {
                //No user exists with these details so redisplay form
                return View(model);
            }
    }        
}

此方法成功通过，我被告知已发送一封电子邮件，但是当我单击此电子邮件时 link 我被带到一个错误页面，错误是无效令牌。因为我改变了这里的逻辑，所以我必须以不同的方式创建令牌吗？

Answer 1

我能够按如下方式解决此问题：

[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public async Task<ActionResult> BillpayRegister(BillpayRegisterViewModel model)
{
  if (ModelState.IsValid)
  {                
    var context = new ApplicationDbContext();
    ApplicationUser customer = context.Users.Where(a => a.MyNewField1 == model.MyNewField1 & a.MyNewField2 == model.MyNewField2).SingleOrDefault();

            if(customer != null)
            {
                var emailCheck = await UserManager.FindByNameAsync(model.Email);

                if (emailCheck == null)
                {
                    //We have found a user and email address has not been already assigned to another
                    //assign the email entered for this user in place of the username and email place
                    //holders and update the user before saving to the database
                    var user = UserManager.FindById(customer.Id);
                    user.UserName = model.Email;
                    UserManager.SetEmail(user.Id, model.Email);                        
                    string hashedNewPassword = UserManager.PasswordHasher.HashPassword(model.Password);
                    user.PasswordHash = hashedNewPassword;
                    var result = UserManager.Update(user); 
                    if (result.Succeeded)
                    {
                        var 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, "Email Verification", "Please confirm your account by clicking this link: <a href=\"" + callbackUrl + "\">link</a>");
                        ViewBag.Link = callbackUrl;

                        ViewBag.Message = "Check your email and confirm your account, you must be confirmed before you can log in.";
                        return View("Info");
                    }                                                
                }
                else
                {
                    //This email address is already assigned to a user
                    return View(model);
                }
            }
            else
            {
                //No user exists with these details so redisplay form
                return View(model);
            }
        }
        // If we got this far, something failed, redisplay form
        return View(model);
    }