asp.net 4.0 web forms routing – default/wildcard route

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You can match all remaining routes like this:

routes.MapPageRoute("defaultRoute", "{*value}", "~/Missing.aspx");

In this case, we know all routes, and want to send anything else to a “missing”/404 page. Just be sure to put this as the last route, since it is a wildcard and will catch everything.

Alternatively you could register a route the same way, but internally does mapping to a page, like this:

routes.Add(new Route("{*value}", new DefaultRouteHandler()));

That handler class would do your wildcard mapping, something like this:

public class DefaultRouteHandler : IRouteHandler
{
  public IHttpHandler GetHttpHandler(RequestContext requestContext)
  { 
    //Url mapping however you want here:
    var pageUrl = requestContext.RouteData.Route.Url + ".aspx";

    var page = BuildManager.CreateInstanceFromVirtualPath(pageUrl, typeof(Page)) 
               as IHttpHandler;
    if (page != null)
    {
      //Set the <form>'s postback url to the route
      var webForm = page as Page;
      if (webForm != null) 
         webForm.Load += delegate { webForm.Form.Action = 
                                    requestContext.HttpContext.Request.RawUrl; };
    }
    return page;
  }
}

This is broken a bit in odd places to prevent horizontal scrolling, but you get the overall point. Again, make sure this is the last route, otherwise it’ll handle all your routes.

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