C#运用GmaQrCode生成二维码

        /// <summary>
        /// 获取二维码
        /// </summary>
        /// <param name="codeString">编码字符</param>
        /// <returns>二维码地址</returns>
        public static string ReturnGmaQrCode(string codeString)
        {
            try
            {
                using (var ms = new MemoryStream())
                {
                    //const string stringtest = "中国inghttp://www.baidu.com/mvc.test?&";
                    if (string.IsNullOrEmpty(codeString))
                    {
                        throw new ArgumentNullException(codeString);
                    }
                    var stringtest = codeString;
                    CreateGmaQrCodeHelper(stringtest, ms);
                    var img = Image.FromStream(ms);
                    var filename = DateTime.Now.ToString("yyyymmddhhmmss");
                    var path = HttpContext.Current.Server.MapPath("~/image/") + filename + ".png";
                    img.Save(path);
                    return path;
                }
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }

        }

        /// <summary>
        /// 获取二维码
        /// </summary>
        /// <param name="strContent">待编码的字符</param>
        /// <param name="ms">输出流</param>
        ///<returns>True if the encoding succeeded, false if the content is empty or too large to fit in a QR code</returns>
        public static bool CreateGmaQrCodeHelper(string strContent, MemoryStream ms)
        {
            try
            {
                //误差校正水平
                const ErrorCorrectionLevel ecl = ErrorCorrectionLevel.M;
                //待编码内容
                var content = strContent;
                //空白区域
                const QuietZoneModules quietZones = QuietZoneModules.Two;
                //大小
                const int moduleSize = 12;
                var encoder = new QrEncoder(ecl);
                QrCode qr;
                //对内容进行编码，并保存生成的矩阵
                if (encoder.TryEncode(content, out qr))
                {
                    var render = new GraphicsRenderer(new FixedModuleSize(moduleSize, quietZones));
                    render.WriteToStream(qr.Matrix, ImageFormat.Png, ms);
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            return true;
        }