C# 生成二维码 两种方式ThoughtWorks.QRCode ZXing

第一种比较直接点

C#中直接引用ThoughtWorks.QRCode.dll 类，
       ThoughtWorks.QRCode.Codec.QRCodeEncoder encoder = new QRCodeEncoder();
        encoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;//编码方法
        encoder.QRCodeScale = 4;//大小
         encoder.QRCodeVersion = 4;//版本
         encoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
  String qrdata = "二维码信息";
System.Drawing.Bitmap bp = encoder.Encode(qrdata.ToString(), Encoding.GetEncoding("GB2312"));
            Image image = bp;
            Object oMissing = System.Reflection.Missing.Value;
            pictureBox1.Image = bp;
保存二维码图片：
SaveFileDialog sf = new SaveFileDialog();
            sf.Title = "选择保存文件位置";
            sf.Filter = "保存图片(*.jpg) |*.jpg|所有文件(*.*) |*.*";
            //设置默认文件类型显示顺序
            sf.FilterIndex = 1;
            //保存对话框是否记忆上次打开的目录
            sf.RestoreDirectory = true;
            if (sf.ShowDialog() == DialogResult.OK)
            {
                Image im = this.pictureBox1.Image;
                //获得文件路径
                localFilePath = sf.FileName.ToString();
                if (sf.FileName != "")
                {
                    fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("\\") + 1);//获取文件名，不带路径