C#生成二维码方法

   /// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="msg">二维码信息</param>
        /// <returns>图片</returns>
        private Bitmap GenByZXingNet(string msg)
        {
            BarcodeWriter writer = new BarcodeWriter();
            writer.Format = BarcodeFormat.QR_CODE;
            writer.Options.Hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");//编码问题
            writer.Options.Hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H);
            const int codeSizeInPixels = 250;   //设置图片长宽
            writer.Options.Height = writer.Options.Width = codeSizeInPixels;
            writer.Options.Margin = 0;//设置边框
            ZXing.Common.BitMatrix bm = writer.Encode(msg);
            Bitmap img = writer.Write(bm);
            pictureBox1.Image = img;
            return img;
        }