/// <summary> /// 獲取臨時二維碼ticket /// </summary> /// <param name="scene_str">場景值ID openid做場景值ID</param> /// <returns></returns> public static string CreateTempQRCode(string scene_str,string access_token) {  var result = HttpUtility.SendPostHttpRequest($"https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token={access_token}", "application/json", "{/"expire_seconds/": 2592000, /"action_name/": /"QR_STR_SCENE/", /"action_info/": {/"scene/": {/"scene_str/": /"" + scene_str + "/"}}}");  JObject jobect = (JObject)JsonConvert.DeserializeObject(result);  string ticket = (string)jobect["ticket"];  if (string.IsNullOrEmpty(ticket))  {   LogHelper.WriteLog(typeof(WeixinHelper), "獲取臨時二維碼ticket失敗" + result);   return null;  }  return ticket; }

 /// <summary> /// 生成帶二維碼的專屬推廣圖片 /// </summary> /// <param name="user"></param> /// <returns></returns> public string Draw(WxUser user) {  //背景圖片  string path = Server.MapPath("/Content/images/tg.jpg");  System.Drawing.Image imgSrc = System.Drawing.Image.FromFile(path);  //處理二維碼圖片大小 240*240px  System.Drawing.Image qrCodeImage = ReduceImage("https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket="+user.ticket, 240, 240);  //處理頭像圖片大小 100*100px  Image titleImage = ReduceImage(user.headimgurl, 100, 100);  using (Graphics g = Graphics.FromImage(imgSrc))  {   //畫專屬推廣二維碼   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);   //畫頭像   g.DrawImage(titleImage, 8, 8, titleImage.Width, titleImage.Height);   Font font = new Font("宋體", 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> /// 縮小/放大圖片 /// </summary> /// <param name="url">圖片網絡地址</param> /// <param name="toWidth">縮小/放大寬度</param> /// <param name="toHeight">縮小/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;  } }

string imagePath = Draw(user);         string result = HttpUtility.UploadFile($"https://api.weixin.qq.com/cgi-bin/material/add_material?access_token={access_token}&type=image", imagePath);JObject jObject = (JObject)JsonConvert.DeserializeObject(result);         string media_id = (string)jObject["media_id"];if (!string.IsNullOrEmpty(media_id)){            string resxml = "<xml><ToUserName><![CDATA[" + xmlMsg.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + xmlMsg.ToUserName + "]]></FromUserName><CreateTime>" + nowtime + "</CreateTime><MsgType><![CDATA[image]]></MsgType><Image><MediaId><![CDATA[" + media_id + "]]></MediaId></Image></xml>";  return resxml;}LogHelper.WriteLog(typeof(WechatController), "上傳專屬推廣圖片素材失敗" + result);