//button點擊事件
private void button1_Click(object sender, EventArgs e)
{
  if (string.IsNullOrEmpty(textBox1.Text))
  {
   MessageBox.Show("請輸入要生成的二維碼！");
   return;
  }
  GenByZXingNet(textBox1.Text);
}

//生成二維碼圖片的函數(shù)
private Bitmap GenByZXingNet(string msg)
 {
  BarcodeWriter writer = new BarcodeWriter();
  writer.Format = BarcodeFormat.QR_CODE;
  writer.Options.Hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");//編碼問題
  writer.Options.Hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H);
  const int codeSizeInPixels = 240; //設(shè)置圖片長寬
  writer.Options.Height = writer.Options.Width = codeSizeInPixels;
  writer.Options.Margin = 1;//設(shè)置邊框
  ZXing.Common.BitMatrix bm = writer.Encode(msg);
  Bitmap img = writer.Write(bm);
  pictureBox1.Image = img;
  return img;
 }

//若需要打開exe默認(rèn)出現(xiàn)一張二維碼，先給textbox初始值，然后添加函數(shù)
private void Form1_Load(object sender, EventArgs e)
 {
  button1_Click(null,null);
 }