ASP.NET WebForms GetVirtualPath always returns null

Question

I am just getting introduced to ASP.NET routing and have two routes registered at the moment:

        routes.MapPageRoute(
            "default",
            "{Path}/{Name}.aspx{Query}",
            "~/Default.aspx",
            true,
            new RouteValueDictionary { { "Name", "default" } },
            new RouteValueDictionary { { "Name", @"[-_\w]+" } });

        routes.MapPageRoute(
            "home",
            "{Name}.aspx{Query}",
            "~/Default.aspx",
            true,
            new RouteValueDictionary { { "Name", "default" } },
            new RouteValueDictionary { { "Name", @"[-_\w]+" } });

However, when I try to build urls using these routes, I always get an exception. I tried this:

private string GetVirtualPath(RouteValueDictionary values)
{
    return RouteTable.Routes.GetVirtualPath(
    null, values).VirtualPath;
}

and also this:

private string GetVirtualPath(RouteValueDictionary values)
{
    var wrapper = new HttpContextWrapper(HttpContext.Current);
    return RouteTable.Routes.GetVirtualPath(
        new RequestContext(wrapper,
          RouteTable.Routes.GetRouteData(wrapper)), 
              values).VirtualPath;
}

Either way, I get a null reference exception on RouteTable.Routes.GetVirtualPath when I call:

GetVirtualPath(new RouteValueDictionary { { "Name", entity.Name } });

Or even:

GetVirtualPath(new RouteValueDictionary { { "Name", entity.Name }, { "Query", string.Empty } });

What could I be doing wrong here?

Answer 1

I guess I'll answer my own question. The problem was with my route restrictions. Once I removed the lines with new RouteValueDictionary { { "Name", @"[-_\w]+" } } everything started working.