/// <summary>

     /// 含有QR码的描述类和包装编码和渲染

     /// </summary>

     public class QRCodeHelper

     {

         /// <summary>

         /// 获取二维码

         /// </summary>

         /// <param name="strContent">待编码的字符</param>

         /// <param name="ms">输出流</param>

         /// <param name="moduleSize">大小</param>

         ///<returns>True if the encoding succeeded, false if the content is empty or too large to fit in a QR code</returns>

         public static bool GetQRCode(string strContent,MemoryStream ms, int moduleSize = )

         {

             ErrorCorrectionLevel Ecl = ErrorCorrectionLevel.M; //误差校正水平

             string Content = strContent;//待编码内容

             QuietZoneModules QuietZones = QuietZoneModules.Two;  //空白区域

             var encoder = new QrEncoder(Ecl);

             QrCode qr;

             if (encoder.TryEncode(Content, out qr))//对内容进行编码，并保存生成的矩阵

             {

                 var render = new GraphicsRenderer(new FixedModuleSize(moduleSize, QuietZones));

                 render.WriteToStream(qr.Matrix, ImageFormat.Png, ms);

             }

             else

             {

                 return false;

             }

             return true;

         }

     }  

 using (var ms = new MemoryStream())

 {

     string strContent = "http://www.baidu.com";

     QRCodeHelper.GetQRCode(strContent, ms, );

     Response.ContentType = "image/Png";

     Response.OutputStream.Write(ms.GetBuffer(), , (int)ms.Length);

     Response.End();

 }