The solution posted by Petriq ASP.NET WebForms: Request.GetFriendlyUrlFileVirtualPath() returns empty string works perfectly in my scenario.
For reference, here is Petriq's code for his HttpRequest extension method:
using System.Web;
using System.Web.Routing;
using Microsoft.AspNet.FriendlyUrls;
namespace Utils.Extensions
{
public static class HttpRequestExtensions
{
public static string GetFileVirtualPathFromFriendlyUrl(this HttpRequest request)
{
string ret = string.Empty;
ret = request.GetFriendlyUrlFileVirtualPath();
if (ret == string.Empty)
{
foreach (RouteBase r in RouteTable.Routes)
{
if (r.GetType() == typeof(Route))
{
Route route = (Route)r;
// Following line modified for case-insensitive comparison
if (String.Compare("/" + route.Url, request.Path, true) == 0)
{
if (route.RouteHandler.GetType() == typeof(PageRouteHandler))
{
PageRouteHandler handler = (PageRouteHandler)route.RouteHandler;
ret = handler.VirtualPath;
}
break;
}
}
}
}
return ret;
}
}
}