问路由前缀不适用于索引

EN

[RoutePrefix("doom-place")]
public class DoomPlaceController : Controller {
    //Matches GET /doom-place
    //Matches GET /doom-place/some_parameter
    [HttpGet]
    [Route("{parameter?}")]
    public ActionResult Index(string parameter) { 
        return View(); 
    }
}

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

    //enable attribute routing     
    routes.MapMvcAttributeRoutes();

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