MVC 4 creating slug type url - asp.net-mvc-4

Question

i am trying to create a stackoverflow like url.
I the following example works fine. But if i remove the controller then it errors out.
http://localhost:12719/Thread/Thread/500/slug-url-text
Note the first Thread is the controller the second is the action.
How can i make the above URL look like the following excluding the controller name from the url?
http://localhost:12719/Thread/500/slug-url-text
My Routes
public class RouteConfig
{
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute("Default", // Route name
"{controller}/{action}/{id}/{ignoreThisBit}",
new
{
controller = "Home",
action = "Index",
id = "",
ignoreThisBit = ""
}); // Parameter defaults )
}
}
Thread Controller
public class ThreadController : Controller
{
//
// GET: /Thread/
public ActionResult Index()
{
string s = URLFriendly("slug-url-text");
string url = "Thread/" + 500 + "/" + s;
return RedirectPermanent(url);
}
public ActionResult Thread(int id, string slug)
{
return View("Index");
}
}

Answer 1

Placing the following route before the default route definition will directly call the 'Thread' action in 'Thread' controller with the 'id' and 'slug' parameter.
routes.MapRoute(
name: "Thread",
url: "Thread/{id}/{slug}",
defaults: new { controller = "Thread", action = "Thread", slug = UrlParameter.Optional },
constraints: new { id = #"\d+" }
);
Then if you really want it to be like stackoverflow, and assume someone enters the id part and not the slug part,
public ActionResult Thread(int id, string slug)
{
if(string.IsNullOrEmpty(slug)){
slug = //Get the slug value from db with the given id
return RedirectToRoute("Thread", new {id = id, slug = slug});
}
return View();
}
hope this helps.