防盗链

 Uri referer = Request.UrlReferrer;
            if ( referer != null)
            {

                //TODO:到时候改回来
                string host = referer.Host;
                if ((host.IndexOf(".aqioo.com") == -1))
                {
                    Response.Redirect("http://www.aqioo.com", true);
                    return;
                }
           }