ASP.NET MVC身份-在登录方法中获取用户角色

Question

我正在使用Visual Studio创建的默认项目

在Login方法中，我需要检查用户是否具有角色，如果没有，我在登录屏幕上警告他需要与该角色相关联，并且不允许登录

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

            var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, shouldLockout: false);

            switch (result)
            {                            
                case SignInStatus.Success:
                    ApplicationUser user = await UserManager.FindAsync(model.Email, model.Password);
                    return RedirectToAction("RedirectLogin");

                case SignInStatus.LockedOut:
                    return View("Lockout");
                case SignInStatus.RequiresVerification:
                    return RedirectToAction("SendCode", new { ReturnUrl = returnUrl, RememberMe = model.RememberMe });
                case SignInStatus.Failure:
                default:
                    ModelState.AddModelError("", "Falha ao Realizar login, usuário ou senha incorretos.");
                    return View(model);
            }
           }
        }