Tips for developing message responses in asp.net WeChat

This article mainly introduces the relevant content of message response in asp.net WeChat development. Friends who need it can refer to it

When ordinary WeChat users send messages to public accounts, the WeChat server will POST the message XML data package to the URL filled in by the developer.
Please note:

• #1. Regarding retry message duplication, it is recommended to use msgid to deduplicate messages.

• 2. If the WeChat server does not receive a response within five seconds, it will disconnect and re-initiate the request, retrying three times in total. If the server cannot guarantee to process and reply within five seconds, you can directly reply with an empty string. The WeChat server will not do anything with this and will not initiate a retry. For details, please see "Send a Message - Passive Reply to a Message".

• 3. In order to ensure higher security, developers can set up message encryption in the developer center on the official website of the public platform. After encryption is turned on, messages sent by users will be encrypted, and messages passively replied to users by official accounts also need to be encrypted (but developers sending messages to users through API calls such as customer service interfaces will not be affected). For detailed instructions on message encryption and decryption, please see "Message Encryption and Decryption Instructions".

The push XML data packet structure of each message type is as follows:
Text message

 <xml>
 <ToUserName><![CDATA[toUser]]></ToUserName>
 <FromUserName><![CDATA[fromUser]]></FromUserName> 
 <CreateTime>1348831860</CreateTime>
 <MsgType><![CDATA[text]]></MsgType>
 <Content><![CDATA[this is a test]]></Content>
 <MsgId>1234567890123456</MsgId>
 </xml>

## Picture message

<xml>
 <ToUserName><![CDATA[toUser]]></ToUserName>
 <FromUserName><![CDATA[fromUser]]></FromUserName>
 <CreateTime>1348831860</CreateTime>
 <MsgType><![CDATA[image]]></MsgType>
 <PicUrl><![CDATA[this is a url]]></PicUrl>
 <MediaId><![CDATA[media_id]]></MediaId>
 <MsgId>1234567890123456</MsgId>
 </xml>

Voice messages

<xml>
<ToUserName><![CDATA[toUser]]></ToUserName>
<FromUserName><![CDATA[fromUser]]></FromUserName>
<CreateTime>1357290913</CreateTime>
<MsgType><![CDATA[voice]]></MsgType>
<MediaId><![CDATA[media_id]]></MediaId>
<Format><![CDATA[Format]]></Format>
<MsgId>1234567890123456</MsgId>
</xml>

## Please note that after

activating voice recognition, every time the user sends a voice to the official account, WeChat will add a Recongnition field to the pushed voice message XML packet (Note: Due to client caching, developers enable or disable the speech recognition function, which will take effect immediately for new followers and take 24 hours for already followed users. Development Users can re-follow this account for testing). The voice XML data packet after enabling voice recognition is as follows:

<xml>
<ToUserName><![CDATA[toUser]]></ToUserName>
<FromUserName><![CDATA[fromUser]]></FromUserName>
<CreateTime>1357290913</CreateTime>
<MsgType><![CDATA[voice]]></MsgType>
<MediaId><![CDATA[media_id]]></MediaId>
<Format><![CDATA[Format]]></Format>
<Recognition><![CDATA[腾讯微信团队]]></Recognition>
<MsgId>1234567890123456</MsgId>
</xml>

In the extra fields, Format is the voice format, usually amr, and Recognition is Speech recognition results are encoded using UTF8.

Video message

<xml>
<ToUserName><![CDATA[toUser]]></ToUserName>
<FromUserName><![CDATA[fromUser]]></FromUserName>
<CreateTime>1357290913</CreateTime>
<MsgType><![CDATA[video]]></MsgType>
<MediaId><![CDATA[media_id]]></MediaId>
<ThumbMediaId><![CDATA[thumb_media_id]]></ThumbMediaId>
<MsgId>1234567890123456</MsgId>
</xml>

Small video Message

<xml>
<ToUserName><![CDATA[toUser]]></ToUserName>
<FromUserName><![CDATA[fromUser]]></FromUserName>
<CreateTime>1357290913</CreateTime>
<MsgType><![CDATA[shortvideo]]></MsgType>
<MediaId><![CDATA[media_id]]></MediaId>
<ThumbMediaId><![CDATA[thumb_media_id]]></ThumbMediaId>
<MsgId>1234567890123456</MsgId>
</xml>

## Geolocation message

<xml>
<ToUserName><![CDATA[toUser]]></ToUserName>
<FromUserName><![CDATA[fromUser]]></FromUserName>
<CreateTime>1351776360</CreateTime>
<MsgType><![CDATA[location]]></MsgType>
<Location_X>23.134521</Location_X>
<Location_Y>113.358803</Location_Y>
<Scale>20</Scale>
<Label><![CDATA[位置信息]]></Label>
<MsgId>1234567890123456</MsgId>
</xml>

Link message

<xml>
<ToUserName><![CDATA[toUser]]></ToUserName>
<FromUserName><![CDATA[fromUser]]></FromUserName>
<CreateTime>1351776360</CreateTime>
<MsgType><![CDATA[link]]></MsgType>
<Title><![CDATA[公众平台官网链接]]></Title>
<Description><![CDATA[公众平台官网链接]]></Description>
<Url><![CDATA[url]]></Url>
<MsgId>1234567890123456</MsgId>
</xml>

##Continuing from the previous article, look at ResponseXML(postString); the method is as follows

 /// <summary>
 /// 获取用户发送的消息
 /// </summary>
 /// <param name="postString"></param>
 private void ResponseXML(string postString)
 {
 //使用XMLDocument加载信息结构  
 XmlDocument xmlDoc = new XmlDocument();
 xmlDoc.LoadXml(postString);

 XmlElement rootElement = xmlDoc.DocumentElement;//获取文档的根

 XmlNode MsgType = rootElement.SelectSingleNode("MsgType"); //获取消息的文本类型

 RequestXML requestXML = new RequestXML();//声明实例，获取各个属性并赋值
 requestXML.ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText;//公众号
 requestXML.FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText;//用户
 requestXML.CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText;//创建时间
 requestXML.MsgType = MsgType.InnerText;//消息类型

 

　　　
 ///对消息的不同类型进行赋值
 if (requestXML.MsgType == "text")
 {
 //赋值文本信息内容
 requestXML.Content = rootElement.SelectSingleNode("Content").InnerText;

 }
 if (requestXML.MsgType.Trim() == "location")
 {
 ///赋值地理位置纬度，经度，地图缩放比例，地理位置说明
 requestXML.Location_X = rootElement.SelectSingleNode("Location_X").InnerText;
 requestXML.Location_Y = rootElement.SelectSingleNode("Location_Y").InnerText;
 requestXML.Scale = rootElement.SelectSingleNode("Scale").InnerText;
 requestXML.Label = rootElement.SelectSingleNode("Label").InnerText;
 }
 if (requestXML.MsgType.Trim().ToLower() == "event")
 {
 ///赋值事件名称和事件key值
 requestXML.EventName = rootElement.SelectSingleNode("Event").InnerText;
 requestXML.EventKey = rootElement.SelectSingleNode("EventKey").InnerText;

 }

 　　　　 if (requestXML.MsgType.Trim().ToLower() == "voice")
 {
 ///赋值语音识别结果，赋值之前一定要记得在开发者模式下，把语音识别功能开启，否则获取不到
 requestXML.Recognition = rootElement.SelectSingleNode("Recognition").InnerText;

 }
 ResponseMsg(requestXML);

}

The voice recognition function is turned on as follows:

requestXML是我单独创建的一个类，该类声明了消息中常用的属性字段，如下：

 /// <summary>
 /// 接收消息的实体类
 /// </summary>
 public class RequestXML
 {
 private String toUserName = String.Empty;

 /// <summary>
 /// 本公众号
 /// </summary>
 public String ToUserName{get;set;}

 /// <summary>
 /// 用户微信号
 /// </summary>
 public String FromUserName{get;set;}

 /// <summary>
 /// 创建时间
 /// </summary>
 public String CreateTime{get;set;}

 /// <summary>
 /// 信息类型 
 /// </summary>
 public String MsgType{get;set;}

 /// <summary>
 /// 信息内容
 /// </summary>
 public String Content{get;set;}

 

 /*以下为事件类型的消息特有的属性*/
 /// <summary>
 /// 事件名称
 /// </summary>
 public String EventName{get;set;}
 /// <summary>
 /// 事件值
 /// </summary>
 public string EventKey { get; set; }

 


 /*以下为图文类型的消息特有的属性*/
 /// <summary>
 /// 图文消息的个数
 /// </summary>
 public int ArticleCount { get; set; }
 /// <summary>
 /// 图文消息的标题
 /// </summary>
 public string Title { get; set; }
 /// <summary>
 /// 图文消息的简介
 /// </summary>
 public string Description { get; set; }
 /// <summary>
 /// 图文消息图片的链接地址
 /// </summary>
 public string PicUrl { get; set; }
 /// <summary>
 /// 图文消息详情链接地址
 /// </summary>
 public string Url { get; set; }
 /// <summary>
 /// 图文消息集合
 /// </summary>
 public List<RequestXML> Articles { get; set;}

 

 /*以下为地理位置类型的消息特有的属性*/
 /// <summary>
 /// 地理位置纬度
 /// </summary>
 public String Location_X { get; set; }

 /// <summary>
 /// 地理位置经度
 /// </summary>
 public String Location_Y { get; set; }

 /// <summary>
 /// 地图缩放比例
 /// </summary>
 public String Scale { get; set; }

 /// <summary>
 /// 地图位置说明
 /// </summary>
 public String Label { get; set; }

 　　/// <summary>
 /// 语音消息特有字段
 /// </summary>
 public String Recognition { get; set; }


 
 }

继续关注 ResponseMsg(requestXML);方法如下

 private void ResponseMsg(RequestXML requestXML)
 {
 string MsgType = requestXML.MsgType;

 try
 {
 //根据消息类型判断发送何种类型消息
 switch (MsgType)
 {
  case "text":
  SendTextCase(requestXML);//发送文本消息
  break;
  case "event"://发送事件消息
  if (!string.IsNullOrWhiteSpace(requestXML.EventName) && requestXML.EventName.ToString().Trim().Equals("subscribe"))
  {
  SendWelComeMsg(requestXML);//关注时返回的图文消息
  }
  else if (!string.IsNullOrWhiteSpace(requestXML.EventName) && requestXML.EventName.ToString().Trim().Equals("CLICK"))
  {
  SendEventMsg(requestXML);//发送事件消息
  }
  break;

　　　　　　　　 case "voice":
  SendVoiceMsg(requestXML);//发送语音消息
  break;
  case "location"://发送位置消息
  SendMapMsg(requestXML);
  break;
  default:
  break;

 }
 }
 catch (Exception ex)
 {
 HttpContext.Current.Response.Write(ex.ToString());
 }
 }

先来关注发送文本消息，SendTextCase(requestXML);//发送文本消息

 /// <summary>
 /// 发送文本
 /// </summary>
 /// <param name="requestXML"></param>
 private void SendTextCase(RequestXML requestXML)
 {
  string responseContent = FormatTextXML(requestXML.FromUserName, requestXML.ToUserName, requestXML.Content);

  HttpContext.Current.Response.ContentType = "text/xml";
  HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;
  HttpContext.Current.Response.Write(responseContent);
  HttpContext.Current.Response.End();
 }

FormatTextXML方法制定格式

 /// <summary>
 /// 返回格式化的Xml格式内容
 /// </summary>
 /// <param name="p1">公众号</param>
 /// <param name="p2">用户号</param>
 /// <param name="p3">回复内容</param>
 /// <returns></returns>
 private string FormatTextXML(string p1, string p2, string p3)
 {
 return "<xml><ToUserName><![CDATA[" + p1 + "]]></ToUserName><FromUserName><![CDATA[" + p2 + "]]></FromUserName><CreateTime>" + DateTime.Now.Subtract(new DateTime(1970, 1, 1, 8, 0, 0)).TotalSeconds.ToString() + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[" + p3 + "]]></Content><FuncFlag>1</FuncFlag></xml>";
 }

这样就能实现消息的应答，如果用户点击的按钮，如下代码：

 case "event"://发送事件消息
  if (!string.IsNullOrWhiteSpace(requestXML.EventName) && requestXML.EventName.ToString().Trim().Equals("subscribe"))
  {
  SendWelComeMsg(requestXML);//关注时返回的图文消息
  }
  else if (!string.IsNullOrWhiteSpace(requestXML.EventName) && requestXML.EventName.ToString().Trim().Equals("CLICK"))
  {
  SendEventMsg(requestXML);//发送事件消息
  }
  break;

 /// <summary>
 /// 发送响应事件消息
 /// </summary>
 /// <param name="requestXML"></param>
 private void SendEventMsg(RequestXML requestXML)
 {
 string keyStr = requestXML.EventKey.ToString();

 switch (keyStr)
 {
 case "mypay":
  SendPayDetails(requestXML);//发送薪资账单
  break;
 case "tianqiyubao":
  SendWeaterMessage(requestXML);//发送天气预报
  break;
 case "kaixinyixiao":
  SendKaiXinMessage(requestXML);//发送开心一笑结果集
  break;
 case "updateMessage":
  SendUpdateMessage(requestXML);//发送修改信息链接
  break;
 case "yuangonghuodong":
  SendYuanGongHuoDong(requestXML);//发送学生活动
  break;
 case "yuangongtongzhi":
  SendYuanGongTongZhi(requestXML);//发送员工通知
  break;
 case "youwenbida":
  SendWenti(requestXML);//发送员工提交问题链接
  break;
 case "mywen":
  SendWentiList(requestXML);//发送问题列表链接
  break;
 case "PhoneSerices":
  SendKeFuMessage(requestXML);//接入客服
  break;
 default:
  String responseContent = String.Empty;
  responseContent = FormatTextXML(requestXML.FromUserName, requestXML.ToUserName,"此功能暂未开放！敬请期待！");
  HttpContext.Current.Response.ContentType = "text/xml";
  HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;
  HttpContext.Current.Response.Write(responseContent);
  HttpContext.Current.Response.End();
  break;
 }
 }

SendWelComeMsg(requestXML);//关注时返回的图文消息

 /// <summary>
 /// 发送关注时的图文消息
 /// </summary>
 /// <param name="requestXML"></param>
 private void SendWelComeMsg(RequestXML requestXML)
 {
 String responseContent = String.Empty;

 string newdate = DateTime.Now.Subtract(new DateTime(1970, 1, 1, 8, 0, 0)).TotalSeconds.ToString();


 string PUrlfileName = "http://www.deqiaohr.com.cn/weixin/welcome.jpg";

 responseContent = string.Format(Message_News_Main, requestXML.FromUserName, requestXML.ToUserName, newdate, "1",
 string.Format(Message_News_Item, "欢迎关注德桥员工服务中心", "苏州德桥人力资源创立于2002年...", PUrlfileName, "http://www.deqiaohr.com.cn/weixin/WxGsjianjie.aspx"));


 HttpContext.Current.Response.ContentType = "text/xml";
 HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;
 HttpContext.Current.Response.Write(responseContent);
 HttpContext.Current.Response.End();
 }

Message_News_Main 和Message_News_Item是图文消息格式化

 /// <summary>
 /// 返回图文消息主体
 /// </summary>
 public static string Message_News_Main
 {
 get
 {
 return @"<xml>
  <ToUserName><![CDATA[{0}]]></ToUserName>
  <FromUserName><![CDATA[{1}]]></FromUserName>
  <CreateTime>{2}</CreateTime>
  <MsgType><![CDATA[news]]></MsgType>
  <ArticleCount>{3}</ArticleCount>
  <Articles>
  {4}
  </Articles>
  </xml> ";
 }
 }
 /// <summary>
 /// 返回图文消息项
 /// </summary>
 public static string Message_News_Item
 {
 get
 {
 return @"<item>
  <Title><![CDATA[{0}]]></Title> 
  <Description><![CDATA[{1}]]></Description>
  <PicUrl><![CDATA[{2}]]></PicUrl>
  <Url><![CDATA[{3}]]></Url>
  </item>";
 }
 }

 /// <summary>
 /// 发送响应语音识别结果
 /// </summary>
 /// <param name="requestXML"></param>
 private void SendVoiceMsg(RequestXML requestXML)
 {
 string responseContent = FormatTextXML(requestXML.FromUserName, requestXML.ToUserName, "您刚才说的语音消息识别结果为：" + requestXML.Recognition.ToString());
 HttpContext.Current.Response.ContentType = "text/xml";
 HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;
 HttpContext.Current.Response.Write(responseContent);
 HttpContext.Current.Response.End();
 }

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