C#生成二维码

http://zxingnet.codeplex.com/

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>
        /// 生成二维码图片
        /// </summary>
        /// <param name="strMessage">要生成二维码的字符串</param>
        /// <param name="width">二维码图片宽度</param>
        /// <param name="height">二维码图片高度</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");//编码问题
            writer.Options.Hints.Add(
                EncodeHintType.ERROR_CORRECTION,
                ZXing.QrCode.Internal.ErrorCorrectionLevel.H
            );
            const int codeSizeInPixels = 250;   //设置图片长宽
            writer.Options.Height = writer.Options.Width = codeSizeInPixels;
            writer.Options.Margin = 0;//设置边框
            ZXing.Common.BitMatrix bm = writer.Encode(msg);
            Bitmap img = writer.Write(bm);
            return img;
        }