asp.net-mvc – 在Route Collection中找不到路由名称

public class MvcApplication : System.Web.HttpApplication
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.MapRoute(
            "MemberRoute",// routeName
            "member/{userId}/{pseudoName}",// url
            new
            {                           // url defaults
                controller = "Member",action = "Index",userId = 0,pseudoName = UrlParameter.Optional
            },new
            {                          // url constraints
                userId = @"d+" // must match url {userId}
            }
        );
    }

    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();

        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
    }
}

MemberController,

public ActionResult Index(int userId,string pseudoName)
    {
        User user;
        var unitOfWork = new UnitOfWork();
        user = unitOfWork.UserRepository.GetById(userId);

        var expectedName = user.PseudoName.ToSEOUrl();
        var actualName = (pseudoName ?? "").ToLower();

        // permanently redirect to the correct URL
        if (expectedName != actualName)
            return RedirectToActionPermanent("Index","Member",new { id = user.UserId,pseudoName = expectedName });
        return View(user);
    }

呼叫者,

return RedirectToRoute("MemberRoute",new { userId = user.UserId,pseudoName = user.PseudoName });

为什么找不到路线名称？