二维码类库ThoughtWorks.QRCode.dll
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
// newFileName = fileNameExt+DateTime.Now.ToString("yyyyMMdd") ;//给文件名后加上时间
FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf(".")); //获取文件路径，带文件名,不带后缀
string fn = sf.FileName;
pictureBox1.Image.Save(FilePath +"-"+ DateTime.Now.ToString("yyyyMMdd") + ".jpg");
}
}
//解析二维码信息
// QRCodeDecoder decoder = new QRCodeDecoder();
// String decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(pictureBox1.Image)));
//this.label3.Text = decodedString;
