MVC 获取路由的 URL 参数值和默认值的集合。

public ActionResult List()
        {
            //获取路由中所有的key
            foreach (string item in RouteData.Values.Keys)
            {
                ViewBag.Keys += item + "--->";
            }
            //获取值
            foreach (string item in RouteData.Values.Values)
            {
                ViewBag.Values += item + "--->";
            }
            //取ID参数值
            ViewBag.id = RouteData.Values["id"];
            return View();
        }