asp.net-mvc-routing – @ Url.Action获取？附加长度= 2

<li><a href="@Url.Action("Index","Terms")">English</a></li>
<li><a href="@Url.Action("Index","Terms","de")">Deutsch</a></li>
<li><a href="@Url.Action("Index","fr")">Fran?ais</a></li>
<li><a href="@Url.Action("Index","it")">Italiano</a></li>
<li><a href="@Url.Action("Index","nl")">Nederlands</a></li>
<li><a href="@Url.Action("Index","hu")">Maygar</a></li>
<li><a href="@Url.Action("Index","es")">Espa?ol</a></li>
<li><a href="@Url.Action("Index","zh")">简体中文</a></li>
<li><a href="@Url.Action("Index","pt-pt")">European Português</a></li>
<li><a href="@Url.Action("Index","pt")">Português</a></li>

这是应该处理点击的操作：

public class TermsController : Controller
{
    public ActionResult Index(string id)
    {
        switch (id)
        {
            case "de":
                return View("de");
            case "fr":
                return View("fr");
            case "it":
                return View("it");
            case "nl":
                return View("nl");
            case "hu":
                return View("hu");
            case "es":
                return View("es");
            case "zh":
                return View("zh");
            case "pt":
                return View("pt");
            case "pt-pt":
                return View("pt-pt");
            default:
                return View();
        }
    }

这些是我的路线：

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

    routes.MapRoute(
        "Terms","{controller}/{id}",new { controller = "Terms",action = "Index" }
        );

    routes.MapRoute(
        "Default","{controller}/{action}/{id}",new { controller = "Home",action = "Index",id = "" }
        );

    routes.MapRoute(
        "ThankYou","{controller}/{action}/{email}/{id}"
        );
}

从主要(即英语)条款页面,第一个(即英语)链接看起来是正确的：

http://localhost:65391/Terms/

为什么其他(即外国)生成的URL看起来像这样？

http://localhost:65391/Terms/?Length=2

奇怪的是,如果我手动输入

http://localhost:65391/Terms/de

例如,转到德语的“条款”页面,然后第一个超链接(即返回“英语条款”页面)如下所示：

http://localhost:65391/Terms/de

到这里查看实际网站：

http://inrix.com/traffic/terms