//生成二维码
        public void generateQRImage()
        {
            string currentPath = System.Web.HttpContext.Current.Server.MapPath(System.Web.HttpContext.Current.Request.ApplicationPath + "" + @"/Content/Qr_code_img");

            string content = generateRecommendUrl();
            Bitmap RQBmp   = QRCodeHelper.Create(content, 410);

            RQBmp = QRCodeHelper.GetThumbnail(RQBmp, 400, 400);

            SaveImg(currentPath, RQBmp);
        }