Html.ActionLink, Url.ActionLink and Html.RouteLink return empty urls

Question

Html.ActionLink, Url.ActionLink and Html.RouteLink return empty urls, even though the target url is valid and displayed properly from url?

I played around with the route but, it keeps return empty url without any exception.

Answer 1

I have the same problem when upgrading my project from mvc2 to mvc3. The problem was in old global.asax file, that I put into new project.

So when I replaced old .asax onto new, actionLinks start to work properly.

Global.asax for mvc3

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;

namespace RealtyMVC
{
public class MvcApplication : System.Web.HttpApplication
{
    //!!!add this method
    public static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
        filters.Add(new HandleErrorAttribute());
    }

    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
        );

    }

    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();
        //!!!and add this call
        RegisterGlobalFilters(GlobalFilters.Filters);

        RegisterRoutes(RouteTable.Routes);
    }
}
}