MVC4 ActionLink without parameters points to current path

Question

I have a MVC4 Index page that have the following links:

@Html.ActionLink("FOO", "Index", "Mil", new { year = String.Empty, id = String.Empty }, null)
@Html.ActionLink("BAR", "Index", "Euro", new { year = String.Empty, id = String.Empty }, null)

But oddly both turn into a hyperlink to the CURRENT path (i.e. if we are at domain/Euro/2016/1 both link to this address), instead of pointing to the specified controller.

Everything normal in RouteConfig:

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

The Controllers/Actions exist and work fine:

EuroController:

public ActionResult Index(int? year, int? id)
 {
    ...
 }

What can be causing this odd behavior?

EDIT:

If i pass year parameter, works fine: @Html.ActionLink("FOO", "Index", "Mil", new { year = 666, id = String.Empty }, null) correctly points to domain/Mil/666.

Probably not the issue, but only the last parameter can be marked as UrlParameter.Optional — user3559349
– user3559349, Commented Oct 17, 2016 at 12:39
I edited my question. That's not the solution but surely is related. I changed year=UrlParameter.Optional in Routes to year="" as you suggested but the problem remained. — Mr Billy
– Mr Billy, Commented Oct 17, 2016 at 13:34
either use null ie: @Html.ActionLink("FOO", "Index", "Mil", new { year = null, id = null }, null) or remove them all together, ie: @Html.ActionLink("FOO", "Index", "Mil", null, null) — Nkosi
– Nkosi, Commented Oct 17, 2016 at 14:13

Mr Billy · Accepted Answer · 2016-10-17 20:00:54Z

I was able to make it work by adding this New route after the Default one.

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

All the following links produce the desired effect:

@Html.ActionLink("Euro 2014", "Index", "Euro", new { year = 2014 }, null)
@Html.ActionLink("Euro 2015", "Index", "Euro", new { year = 2015, id = String.Empty }, null)
@Html.ActionLink("Euro 2016", "Index", "Euro", new { year = DateTime.Now.Year, id = "" }, null)
@Html.ActionLink("Back to Euro", "Index", "Euro", new { year = String.Empty }, null)

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