Asp .Net MVC 获取请求路由数据

protected String RouteController {     get     {         return GetRouteData("controller");     } }  protected String RouteAction {     get     {         return GetRouteData("action");     } }  protected String RouteID {     get     {         return GetRouteData("id");     } }  protected String GetRouteData(String key) {     if (String.IsNullOrEmpty(key))         return null;     // Mvc 都是使用小写字母     key = key.ToLower();      IDictionary<string, object> routeValues = this.ControllerContext.RouteData.Values;     if (!routeValues.ContainsKey(key))         return null;     return routeValues[key].ToString(); }