Question

Given a particular URL, how do I find out for sure which controller action it is being routed to (perhaps in the context of a large application with many controllers and a complex route registry)?

I’m not asking how to configure routes.

Answer 1

Something like this for controller:

string controller = RouteData.GetRequiredString("controller");

And for action:

string action = RouteData.GetRequiredString("action");

For example you can use it in your base controller class:

    public class YouControllerBase: Controller
    {
          protected override void Execute(System.Web.Routing.RequestContext requestContext)
          {
              string controller = requestContext.RouteData.GetRequiredString("controller");
              string action = requestContext.RouteData.GetRequiredString("action");
          }
   }

Or use it in global.asax:

    protected void Application_BeginRequest(object sender, EventArgs e)
    {
        RouteData routeData = RouteTable.Routes.GetRouteData(
            new HttpContextWrapper(HttpContext.Current));
        var action = routeData.GetRequiredString("action");
    }