private void AddVisitLog(ActionExecutingContext filterContext, string vid)
        {
            VisitLog log = new VisitLog();

            log.VisitorId     = vid;
            log.VisitTime     = DateTime.Now;
            log.ClientIp      = HttpRequestUtil.GetClientIp(filterContext.RequestContext.HttpContext.Request);
            log.UserAgent     = filterContext.RequestContext.HttpContext.Request.UserAgent;
            log.EnterUrl      = string.Concat(filterContext.RequestContext.HttpContext.Request.Url);
            log.RefererUrl    = string.Concat(filterContext.RequestContext.HttpContext.Request.UrlReferrer);
            log.VisitTimeInMs = TimeUtility.ToUtcTimeInMillis(log.VisitTime);
            VisitorService.AddVisitLog(log);
        }