public async Task <IActionResult> EditRoles(string userName) { var presenter = new MvcEditRolesPresenter(); var useCaseResult = await mediator.Send(new GetEditRoles(userName, presenter)); if (!useCaseResult.IsSuccessful) { ShowErrorMessage($"Benutzer mit username {userName} nicht gefunden!"); return(RedirectToAction("MemberManagement")); } return(View(presenter.GetViewModel())); }