public Bitmap QRCodeBimapForString(string nr)

{

   string enCodeString = nr;

   QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();

   //编码方式(注意：BYTE能支持中文，ALPHA_NUMERIC扫描出来的都是数字)

   qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;

   qrCodeEncoder.QRCodeScale = ;//大小(值越大生成的二维码图片像素越高)

   //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)

   qrCodeEncoder.QRCodeVersion = ;

   //错误效验、错误更正(有4个等级)

   qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;

   return qrCodeEncoder.Encode(enCodeString, Encoding.GetEncoding("GB2312"));

}

public Image QRCodeSave(string nr)

{

    Bitmap bt = QRCodeBimapForString(nr);

    Image img = bt;

    string filePath = "../../image/";

    string fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".png";

    if (!Directory.Exists(filePath))

    {

         Directory.CreateDirectory(filePath);

    }

    string path = Path.Combine(filePath, fileName);

    bt.Save(path);

    //如果要显示图片就要有返回值

    return img ;

}

private void button1_Click(object sender, EventArgs e)

 {

       QRCode qrCode = new QRCode();

       //我自己的博客“http://blog.csdn.net/hyunbar”

       Image img =  qrCode.QRCodeSave("http://blog.csdn.net/hyunbar");

       if (img != null)

       {

            this.pictureBox1.Image = img;

       }

}