MVC中的URL编码

以前我有如下网址:

http://xyz.in/Modules/kOPYWOeJHOjPM04ejG%2faRA%3d%3d

http://xyz.in/Modules/id=kOPYWOeJHOjPM04ejG%2faRA%3d%3d

(在参数值之前添加id=before)则工作正常。

我希望url在不提及id(参数名)的情况下工作。我能做到吗?

更新:

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

和控制器代码:

public class ModulesController : Controller
{
    public ActionResult Modules(string id)
    {
        var topic = new Topic();
        return View("Modules", topic.GetTopicWithModules(HttpUtility.UrlDecode(id)));
    }
}