public override ActionResult Index()
        {
            string appid = Request["appId"];

            if (!string.IsNullOrEmpty(appid))
            {
                AppId          = int.Parse(appid);
                @ViewBag.AppId = appid;
            }
            else
            {
                AppId          = (int)CategoryType.Undefined;
                @ViewBag.AppId = AppId;
            }

            ViewBag.Apps = WeChatCommonService.GetAppList();

            return(View());
        }