C# Mvc Generic Route using Slug

Question

I'm trying to create a generic route to work with slugs, but I always got an error

The idea is, instead of www.site.com/controller/action I get in the url a friendly www.site.com/{slug}

e.g. www.site.com/Home/Open would be instead www.site.com/open-your-company

Error

server error in '/' application The Resource cannot be found

In my Global.asax I have

public static void RegisterRoutes(RouteCollection routes)
{
    //routes.Clear();
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

    routes.MapRoute("DefaultSlug", "{slug}", new { controller = "Home", action = "Open", slug = "" });
    routes.MapRoute(
        name: "Default",
        url: "{controller}/{action}/{id}",
        defaults: new
        {
            area = "",
            controller = "Home",
            action = "Index",
            id = UrlParameter.Optional,
            slug = ""
        }
    );
}

In one of my cshtml I have the following link (even when it's commented, there is still the same error).

@Html.ActionLink("Open your company", "DefaultSlug", new { controller = "Home", action = "Open", slug = "open-your-company" })

EDIT: HomeController

public ActionResult Open() { 
    return View(new HomeModel()); 
}

Answer 1

In Global.asax you slug can not be empty,if empty ,the url will be not go to the default route

public static void RegisterRoutes(RouteCollection routes)
{
    //routes.Clear();
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

    routes.MapRoute(
        name: "DefaultSlug",
        url: "{slug}",
        defaults: new { controller = "Home", action = "Open" },
        constraints: new{ slug=".+"});

    routes.MapRoute(
        name: "Default",
        url: "{controller}/{action}/{id}",
        defaults: new
        {
            area = "",
            controller = "Home",
            action = "Index",
            id = UrlParameter.Optional
        }
    );
}

And update the HomeController

public ActionResult Open(string slug) {
    HomeModel model = contentRepository.GetBySlug(slug);

    return View(model); 
}

Testing Route link...

@Html.RouteLink("Open your company", routeName: "DefaultSlug", routeValues: new { controller = "Home", action = "Open", slug = "open-your-company" })

and Action link...

@Html.ActionLink("Open your company", "Open", routeValues: new { controller = "Home", action = "Open", slug = "open-your-company" })

both produces...

http://localhost:35979/open-your-company