I've looked at http://stackoverflow.com/questions/817325/asp-net-mvc-routing-legacy-urls-passing-querystring-ids-to-controller-actions and several other similar posts for legacy URL routing, but I can't get past the error "The RouteData must contain an item named 'controller' with a non-empty string value." Looking this up on line didn't give me any hints to solve my problem.

I've implemented the Legacy routing class described in the link above, and this is what I've defined in the routing table:

        routes.Add(
            "Legacy", 
            new LegacyRoute("fooref.aspx", 
            "FooRef", 
            new LegacyRouteHandler())
        );

        routes.MapRoute(
            "FooRef",
            "{controller}/{action}",
            new
            {
                controller = "Home",
                action = "Index",
                foo_id = UrlParameter.Optional,
                bar_id = UrlParameter.Optional
            }
        );

When I use Phil Haack's route debugger, it indicates that fooref.aspx has a match, but when I turn the route debugger off, I get the error above. If I reverse the statement order, I get "Resource not found" for /ctprefer.aspx, which makes sense -- so it appears to be finding that as a valid route when put in the other order.

Where do I need to declare this missing controller reference?

Have routing requirements changed for ASP.NET MVC 2 RTM?