关于QRCode生成二维码（背景图、Logo）

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关于QRCode生成二维码的代码
/// <summary>          /// 创建二维码          /// </summary>          /// <param name="QRString">二维码字符串</param>          /// <param name="QRCodeEncodeMode">二维码编码(Byte、AlphaNumeric、Numeric)</param>          /// <param name="QRCodeScale">二维码尺寸(Version为0时，1：26x26，每加1宽和高各加25</param>          /// <param name="QRCodeVersion">二维码密集度0-40</param>          /// <param name="QRCodeErrorCorrect">二维码纠错能力(L：7% M：15% Q：25% H：30%)</param>          /// <param name="filePath">保存路径</param>          /// <param name="hasLogo">是否有logo(logo尺寸50x50，QRCodeScale>=5，QRCodeErrorCorrect为H级)</param>          /// <param name="logoFilePath">logo路径</param>          /// <returns></returns>  public static bool CreateQRCode(string QRString, string QRCodeEncodeMode, short QRCodeScale, int QRCodeVersion, string QRCodeErrorCorrect, string filePath, bool hasLogo, string logoFilePath,bool hasBack, string backFilePath,string backName, string fileName)        {            bool result = true;            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();            switch (QRCodeEncodeMode)            {                case "Byte":                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;                    break;                case "AlphaNumeric":                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;                    break;                case "Numeric":                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;                    break;                default:                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;                    break;            }            qrCodeEncoder.QRCodeScale = QRCodeScale;            qrCodeEncoder.QRCodeVersion = QRCodeVersion;            switch (QRCodeErrorCorrect)            {                case "L":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;                    break;                case "M":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;                    break;                case "Q":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;                    break;                case "H":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;                    break;                default:                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;                    break;            }            try            {                if (hasBack)                {                    //抓取背景图片复制到新文件夹并命名                    File.Copy(backFilePath, filePath + fileName);                    //生成二维码图片                    Image image_b = qrCodeEncoder.Encode(QRString, System.Text.Encoding.UTF8);                    System.IO.FileStream fs_b = new System.IO.FileStream(filePath + backName, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);                    //存储二维码图片                    image_b.Save(fs_b, System.Drawing.Imaging.ImageFormat.Jpeg);                    //关闭IO                    fs_b.Close();                    //将二维码图片转化为Image对象                    Image copyImage = Image.FromFile(filePath + backName);                    //创建FileStream                    FileStream fs = new FileStream(filePath + fileName, FileMode.Open, FileAccess.Read, FileShare.Read);                    //将背景图片转化为二进制数据                    byte[] buffer = new byte[fs.Length];                    int length = 0;                    int ibyteRead = 0;                    do                    {                        length = fs.Read(buffer, ibyteRead, buffer.Length - ibyteRead);                        ibyteRead += length;                    }                    while (length > 0);                    MemoryStream mfs = new MemoryStream(buffer);                    //关闭创建FileStream                    fs.Close();                    fs.Dispose();                    //创建画布                    Image bmp = Image.FromStream(mfs);                    //创建Graphics类                    Graphics g = Graphics.FromImage(bmp);                    //设定坐标                    int x = bmp.Width / 2 - copyImage.Width / 2;                    int y = ((bmp.Height / 5)*4)/2 - copyImage.Height / 2;                    //开始在背景图上将画二维码                    g.DrawImage(copyImage, new Rectangle(x, y, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);                    g.Dispose();                    //保存画好的图片                    bmp.Save(filePath + fileName);                    copyImage.Dispose();                    //删除生成的二维码图片                    if (File.Exists(filePath + backName))                    {                        File.Delete(filePath + backName);                    }                }                else                {                    Image image = qrCodeEncoder.Encode(QRString, System.Text.Encoding.UTF8);                    System.IO.FileStream fs = new System.IO.FileStream(filePath + fileName, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);                    image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);                    fs.Close();                    if (hasLogo)                    {                        Image copyImage = System.Drawing.Image.FromFile(logoFilePath);                        Graphics g = Graphics.FromImage(image);                        int x = image.Width / 2 - copyImage.Width / 2;                        int y = image.Height / 2 - copyImage.Height / 2;                        g.DrawImage(copyImage, new Rectangle(x, y, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);                        g.Dispose();                        image.Save(filePath + fileName);                        copyImage.Dispose();                    }                    image.Dispose();                }            }            catch (Exception ex)            {                result = false;            }            return result;        }
使用本方法时请先调用ThougtWorks.QRCode.dll
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