C#生成带二维码的专属微信公众号推广海报实例代码

 /// <summary>
 /// 生成带二维码的专属推广图片
 /// </summary>
 /// <param name="user"></param>
 /// <returns></returns>
 public string Draw(WxUser user)
 {
  //背景图片
  string path = Server.MapPath("/Content/images/tg.jpg");

  System.Drawing.Image imgSrc = System.Drawing.Image.FromFile(path);

  //处理二维码图片大小 240*240px
  System.Drawing.Image qrCodeImage = ReduceImage("https://www.easck.com/cgi-bin/showqrcode?ticket="+user.ticket, 240, 240);

  //处理头像图片大小 100*100px
  Image titleImage = ReduceImage(user.headimgurl, 100, 100);

  using (Graphics g = Graphics.FromImage(imgSrc))
  {
   //画专属推广二维码
   g.DrawImage(qrCodeImage, new Rectangle(imgSrc.Width - qrCodeImage.Width - 200,
   imgSrc.Height - qrCodeImage.Height - 200,
   qrCodeImage.Width,
   qrCodeImage.Height),
   0, 0, qrCodeImage.Width, qrCodeImage.Height, GraphicsUnit.Pixel);

   //画头像
   g.DrawImage(titleImage, 8, 8, titleImage.Width, titleImage.Height);

   Font font = new Font("宋体", 30, FontStyle.Bold);

   g.DrawString(user.nickname, font, new SolidBrush(Color.Red), 110, 10);
  }
  string newpath = Server.MapPath(@"/Content/images/newtg_" + Guid.NewGuid().ToString() + ".jpg");
  imgSrc.Save(newpath, System.Drawing.Imaging.ImageFormat.Jpeg);
  return newpath;
 }


 /// <summary>
 /// 缩小/放大图片
 /// </summary>
 /// <param name="url">图片网络地址</param>
 /// <param name="toWidth">缩小/放大宽度</param>
 /// <param name="toHeight">缩小/放大高度</param>
 /// <returns></returns>
 public Image ReduceImage(string url, int toWidth, int toHeight)
 {
  WebRequest request = WebRequest.Create(url);
  WebResponse response = request.GetResponse();
  Stream responseStream = response.GetResponseStream();

  Image originalImage = Image.FromStream(responseStream);
  if (toWidth <= 0 && toHeight <= 0)
  {
   return originalImage;
  }
  else if (toWidth > 0 && toHeight > 0)
  {
   if (originalImage.Width < toWidth && originalImage.Height < toHeight)
    return originalImage;
  }
  else if (toWidth <= 0 && toHeight > 0)
  {
   if (originalImage.Height < toHeight)
    return originalImage;
   toWidth = originalImage.Width * toHeight / originalImage.Height;
  }
  else if (toHeight <= 0 && toWidth > 0)
  {
   if (originalImage.Width < toWidth)
    return originalImage;
   toHeight = originalImage.Height * toWidth / originalImage.Width;
  }
  Image toBitmap = new Bitmap(toWidth, toHeight);
  using (Graphics g = Graphics.FromImage(toBitmap))
  {
   g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
   g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
   g.Clear(Color.Transparent);
   g.DrawImage(originalImage,
      new Rectangle(0, 0, toWidth, toHeight),
      new Rectangle(0, 0, originalImage.Width, originalImage.Height),
      GraphicsUnit.Pixel);
   originalImage.Dispose();
   return toBitmap;
  }
 }								 
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