public async Task <IActionResult> Register(RegisterViewModel model) { if (ModelState.IsValid) { var user = _userStore.Queryable.SingleOrDefault(p => p.Name == model.UserName); if (user.IsNotNull()) { ModelState.AddModelError(string.Empty, "用户已存在"); return(View(model)); } user = new User { Name = model.UserName, PasswordHash = _passwordHash.ComputeHash(model.Password), Gender = model.IsMale ? UserGender.Male : UserGender.Female, }; _userStore.Add(user); await _userStore.Accessor.SaveChangesAsync(); return(RedirectToAction(nameof(Login))); } return(View(model)); }