水晶报表（CrystalReport）模板绘制二维码

 /// <summary>
        /// 二维码生成函数
        /// </summary>
        /// <param name="data">二维码值：比如：111111</param>
        /// <returns></returns>
        private Bitmap GenerateQRCode(string data)
        {
            BarcodeWriter writer = new BarcodeWriter();
            writer.Format = BarcodeFormat.QR_CODE;
            EncodingOptions options = new EncodingOptions() { Width = 300, Height = 300 }; // 设置二维码尺寸
            writer.Options = options;

            Bitmap qrCodeBitmap = writer.Write(data); // 生成二维码图片

            return qrCodeBitmap;
        }

        /// <summary>
        /// 将bitmap类型转byte[]
        /// </summary>
        /// <param name="bitmap"></param>
        /// <returns></returns>
        public static byte[] BitmapToGrayByte(Bitmap bitmap)
        {
            byte[] bytes = null;
            try
            {
                Bitmap b = new Bitmap(bitmap);
                MemoryStream ms = new MemoryStream();
                b.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
                bytes = ms.GetBuffer();  //byte[]   bytes=   ms.ToArray(); 这两句都可以，至于区别么，下面有解释
                ms.Close();
            }
            catch (Exception ex)
            {
                LogWrite.AddLgoToTXT("BitmapToGrayByte异常错误：" + ex.Message);
            }
            return bytes;
        }