利用ZXing插件生成二维码

    using System.Drawing;
    using ZXing;
    using ZXing.QrCode;

        /// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="dirPath">路径</param>
        /// <returns></returns>
        private string GenerateQRCode(string dirPath)
        {
            BarcodeWriter writer = new BarcodeWriter();
            writer.Format = BarcodeFormat.QR_CODE;
            QrCodeEncodingOptions options = new QrCodeEncodingOptions();
            options.DisableECI = true;
            //设置内容编码
            options.CharacterSet = "UTF-8";
            //设置二维码的宽度和高度
            options.Width = 500;//500
            options.Height = 500;//500
            //设置二维码的边距,单位不是固定像素
            options.Margin = 1;
            writer.Options = options;
            StringBuilder content = new StringBuilder();
            content.AppendFormat("SUCCESS：创建二维码成功！");
            Bitmap map = writer.Write(content.ToString());
            string fileName = @dirPath + @"QrCode.png";
            map.Save(fileName, ImageFormat.Png);
            map.Dispose();
            return fileName;
        }