ThoughtWorks.QRCode.Codec.QRCodeEncoder encoder = new QRCodeEncoder();
encoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//编码方法(注意：BYTE能支持中文，ALPHA_NUMERIC扫描出来的都是数字)
encoder.QRCodeScale = 4;//大小
encoder.QRCodeVersion = 0;//版本(注意：设置为0主要是防止编码的字符串太长时发生错误)
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;

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
  string localFilePath = sf.FileName.ToString();
  if (sf.FileName != "")
  {
    string 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
    string 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;

internal const System.String DEFAULT_BYTE_MODE_ENCODING = "ISO-8859-1";

using com.google.zxing.qrcode;
using com.google.zxing;
using com.google.zxing.common;
using ByteMatrix = com.google.zxing.common.ByteMatrix;
using EAN13Writer = com.google.zxing.oned.EAN13Writer;
using EAN8Writer = com.google.zxing.oned.EAN8Writer;
using MultiFormatWriter = com.google.zxing.MultiFormatWriter;

string content = "二维码信息";
ByteMatrix byteMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 300, 300);
Bitmap bitmap = toBitmap(byteMatrix);
pictureBox1.Image = bitmap;
SaveFileDialog sFD = new SaveFileDialog();
sFD.Filter = "保存图片(*.png) |*.png|所有文件(*.*) |*.*";
sFD.DefaultExt = "*.png|*.png";
sFD.AddExtension = true;
if (sFD.ShowDialog() == DialogResult.OK)
{
if (sFD.FileName != "")
{
  writeToFile(byteMatrix, System.Drawing.Imaging.ImageFormat.Png, sFD.FileName);
}
}

if (this.openFileDialog1.ShowDialog() != DialogResult.OK)
{
return;
}
Image img = Image.FromFile(this.openFileDialog1.FileName);
Bitmap bmap;
try
{
bmap = new Bitmap(img);
}
catch (System.IO.IOException ioe)
{
MessageBox.Show(ioe.ToString());
return;
}
if (bmap == null)
{
MessageBox.Show("Could not decode image");
return;
}
LuminanceSource source = new RGBLuminanceSource(bmap, bmap.Width, bmap.Height);
com.google.zxing.BinaryBitmap bitmap1 = new com.google.zxing.BinaryBitmap(new HybridBinarizer(source));
Result result;
try
{
result = new MultiFormatReader().decode(bitmap1);
}
catch (ReaderException re)
{
MessageBox.Show(re.ToString());
return;
}
MessageBox.Show(result.Text);
public static void writeToFile(ByteMatrix matrix, System.Drawing.Imaging.ImageFormat format, string file)
{
    Bitmap bmap = toBitmap(matrix);
    bmap.Save(file, format);
}
public static Bitmap toBitmap(ByteMatrix matrix)
{
    int width = matrix.Width;
    int height = matrix.Height;
    Bitmap bmap = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
    for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
  bmap.SetPixel(x, y, matrix.get_Renamed(x, y) != -1 "0xFF000000") : ColorTranslator.FromHtml("0xFFFFFFFF"));
}
}
return bmap;
}