Determing the physical path of a user friendly url - asp.net

Question

I have been asked to look at updating an old ASP.net Web Forms application to ASP.net 4.5; specifically to implement Microsoft's 'User Friendly' routing mechanism (NuGet Package Microsoft.AspNet.FriendlyUrls).
Generally, the upgrade was straightforward, but I am left with one problem.
The original developer attached/associated 'meta data' XML files to many of the web pages.. For example, /Products/Tables/Oak.aspx might also have the following meta file /Products/Tables/Oak.aspx.meta
When the page loads, it 'looks' for the meta file and loads it. In a non-rewritten URL environment, this was easy...
string metaUrl = Page.Request.Url.AbsolutePath + ".meta";
string metaPath = Page.Server.MapPath(metaUrl);
If (System.IO.File.Exists(metaPath)) {
LoadMetaFile(metaPath);
}
In a 'Friendly URL' environment, this is not so easy as the original URL might be rewritten to /Products/Tables/Oak or maybe even rewritten completely via a custom MapPageRoute() definition.
Does anyone know if there a way that I can find/determine the 'true' path of the page?

Answer 1

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;
}
}
}