private void btn_ZXing_Click(object sender, EventArgs e)
        {
            int height = 100; int.TryParse(txt_height.Text, out height);//二维码高度
            int width = 100; int.TryParse(txt_width.Text, out width);//二维码宽度
            string rqcodeData = txt_zxingUrl.Text;//二维码url
            if (string.IsNullOrWhiteSpace(rqcodeData))
            {
                MessageBox.Show("请填写二维码url"); return;
            }

            //配置二维码规格
            QrCodeEncodingOptions qr = new QrCodeEncodingOptions();
            qr.CharacterSet = "UTF-8";
            qr.Height = height;
            qr.Width = width;
            qr.Margin = 0;

            //生成二维码位图
            BarcodeWriter wr = new BarcodeWriter();
            wr.Format = BarcodeFormat.QR_CODE;//选择二维码，还可以选择条码，类型有很多
            wr.Options = qr;
            Bitmap bitmap = wr.Write(rqcodeData);

            //因为这个是winform项目所以我直接就给pictureBox绑定图片了
            pic_zxing.Image = Image.FromHbitmap(bitmap.GetHbitmap());

            //也可以保存到本地
            string fileDirectory = AppDomain.CurrentDomain.BaseDirectory + @"encode";
            string fileName = Guid.NewGuid().ToString("N") + ".jpg";
            if (Directory.Exists(fileDirectory) == false)
                Directory.CreateDirectory(fileDirectory);
            string newName = Path.Combine(fileDirectory, fileName);
            bitmap.Save(newName, ImageFormat.Jpeg);

            bitmap.Dispose();
        }

        private void btn_twqr_Click(object sender, EventArgs e)
        {
            int size = 4;//二维码大小，值越大像素越大
            int.TryParse(txt_size.Text, out size);
            string rqcodeData = txt_twqr.Text;//二维码url
            if (string.IsNullOrWhiteSpace(rqcodeData))
            {
                MessageBox.Show("请填写二维码url"); return;
            }

            QRCodeEncoder encoder = new QRCodeEncoder();
            encoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//编码方式(注意：BYTE能支持中文，ALPHA_NUMERIC扫描出来的都是数字)
            encoder.QRCodeScale = size;
            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;//错误效验、错误更正(有4个等级)
            //encoder.QRCodeBackgroundColor = Color.Yellow;//背景颜色
            //encoder.QRCodeForegroundColor = Color.Green;//字体颜色

            Bitmap bitmap = encoder.Encode(rqcodeData);//生成二维码
            pic_twqr.Image = Image.FromHbitmap(bitmap.GetHbitmap());

            bitmap.Dispose();
        }