https://www.cnblogs.com/WhyShang/p/3704513.html
private void button1_Click(object sender, EventArgs e)
{
string msg = textBox1.Text;
Image img = GenByZXingNet(msg);
this.pictureBox1.Image=img;
}
/// <summary>
/// 生成二維碼圖片
/// </summary>
/// <param name="strMessage">要生成二維碼的字符串</param>
/// <param name="width">二維碼圖片寬度</param>
/// <param name="height">二維碼圖片高度</param>
/// <returns></returns>
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 = 250; //設置圖片長寬
writer.Options.Height = writer.Options.Width = codeSizeInPixels;
writer.Options.Margin = 0;//設置邊框
ZXing.Common.BitMatrix bm = writer.Encode(msg);
Bitmap img = writer.Write(bm);
return img;
}