MVC中使用QrCodeNet 生成二维码

 using System.Drawing;

 using System.Drawing.Imaging;

 using System.IO;

 using Gma.QrCodeNet.Encoding;

 using Gma.QrCodeNet.Encoding.Windows.Render;

 namespace QRCodeDemo

 {

     public class QRCodeHelper

     {

         /// <summary>

         /// 生成二维码

         /// </summary>

         /// <param name="content">内容</param>

         /// <param name="moduleSize">二维码的大小</param>

         /// <returns>输出流</returns>

         public static MemoryStream GetQRCode(string content, int moduleSize = )

         {

             //ErrorCorrectionLevel 误差校正水平

             //QuietZoneModules     空白区域

             var encoder = new QrEncoder(ErrorCorrectionLevel.M);

             QrCode qrCode = encoder.Encode(content);

             GraphicsRenderer render = new GraphicsRenderer(new FixedModuleSize(moduleSize, QuietZoneModules.Two) , Brushes.Black, Brushes.White);

             MemoryStream memoryStream = new MemoryStream();

             render.WriteToStream(qrCode.Matrix, ImageFormat.Jpeg, memoryStream);

             return memoryStream;

             //生成图片的代码

             //DrawingSize dSize = render.SizeCalculator.GetSize(qrCode.Matrix.Width);

             //Bitmap map = new Bitmap(dSize.CodeWidth, dSize.CodeWidth);

             //Graphics g = Graphics.FromImage(map);

             //render.Draw(g, qrCode.Matrix);

             //map.Save(fileName, ImageFormat.Jpeg);//fileName为存放的图片路径

         }

         /// <summary>

         /// 生成带Logo二维码

         /// </summary>

         /// <param name="content">内容</param>

         /// <param name="iconPath">logo路径</param>

         /// <param name="moduleSize">二维码的大小</param>

         /// <returns>输出流</returns>

         public static MemoryStream GetQRCode(string content, string iconPath, int moduleSize = )

         {

             QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.M);

             QrCode qrCode = qrEncoder.Encode(content);

             GraphicsRenderer render = new GraphicsRenderer(new FixedModuleSize(moduleSize, QuietZoneModules.Two), Brushes.Black, Brushes.White);

             DrawingSize dSize = render.SizeCalculator.GetSize(qrCode.Matrix.Width);

             Bitmap map = new Bitmap(dSize.CodeWidth, dSize.CodeWidth);

             Graphics g = Graphics.FromImage(map);

             render.Draw(g, qrCode.Matrix);

             //追加Logo图片 ,注意控制Logo图片大小和二维码大小的比例

             //PS:追加的图片过大超过二维码的容错率会导致信息丢失,无法被识别

             Image img = Image.FromFile(iconPath);

             Point imgPoint = new Point((map.Width - img.Width) / , (map.Height - img.Height) / );

             g.DrawImage(img, imgPoint.X, imgPoint.Y, img.Width, img.Height);

             MemoryStream memoryStream = new MemoryStream();

             map.Save(memoryStream, ImageFormat.Jpeg);

             return memoryStream;

             //生成图片的代码： map.Save(fileName, ImageFormat.Jpeg);//fileName为存放的图片路径

         }

     }

 }

 public ActionResult CreateQrCode()

  {

        string str = "http://cn.bing.com/search?q=C%23";

        using (var memoryStream = QRCodeHelper.GetQRCode(str))

        {

              Response.ContentType = "image/jpeg";

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

              Response.End();

        }

        return null;

 }

 <img id="qrcode" src="@Url.Action("CreateQrCode")"  />