C# 微信公众平台开发（3）-- 接受/发送消息

1.接收事件

关注/取消关注事件；

用户在关注与取消关注公众号时，微信会把这个事件推送到开发者填写的URL。

通过微信返回的XML，我们通过代码 就可以作相应的处理；

先获取返回的信息：

1     if (HttpContext.Current.Request.HttpMethod.ToUpper() == "POST")  2             {  3                 using (Stream stream = HttpContext.Current.Request.InputStream)  4                 {  5                     Byte[] postBytes = new Byte[stream.Length];  6                     stream.Read(postBytes, 0, (Int32)stream.Length);  7                     postString = Encoding.UTF8.GetString(postBytes);  8                     EventHandle(postString);  9                 } 10  11                 if (!string.IsNullOrEmpty(postString)) 12                 { 13                     responseMsg(postString, context);//关注微信，返回消息 14                 } 15             }

postString  里面 就是XML;我们只需要对 XML作相应的处理就好

System.Xml.XmlDocument postObj = new   System.Xml.XmlDocument();     postObj.LoadXml(postStr);  var eventList = postObj.GetElementsByTagName("Event");  var textpl = ""; string FromUserName = string.Empty;     for (int i = 0; i < FromUserNameList.Count; i++)     {      if (FromUserNameList[i].ChildNodes[0].NodeType == System.Xml.XmlNodeType.CDATA)      {       FromUserName = FromUserNameList[i].ChildNodes[0].Value;      }     } var toUsernameList = postObj.GetElementsByTagName("ToUserName");     string ToUserName = string.Empty;     for (int i = 0; i < toUsernameList.Count; i++)     {      if (toUsernameList[i].ChildNodes[0].NodeType == System.Xml.XmlNodeType.CDATA)      {       ToUserName = toUsernameList[i].ChildNodes[0].Value;      }     }  if (toEvent == "subscribe")      {       string rebakcHtml = @"Hi,欢迎来到我爱足球社区";      //ReceivedText 返回文本消息的格式       textpl = type.ReceivedText(FromUserName, ToUserName, rebakcHtml);    } 

1   /// <summary>  2         /// 回复文本  3         /// </summary>  4         /// <param name="FromUserName"></param>  5         /// <param name="ToUserName"></param>  6         /// <param name="Content"></param>  7         /// <returns></returns>  8         public string ReceivedText(string FromUserName, string ToUserName, string Content)  9         { 10  11             string textpl = string.Empty; 12             textpl = "<xml>" + 13                      "<ToUserName><![CDATA[" + FromUserName + "]]></ToUserName>" + 14                      "<FromUserName><![CDATA[" + ToUserName + "]]></FromUserName>" + 15                      "<CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime>" + 16                      "<MsgType><![CDATA[text]]></MsgType>" + 17                      "<Content><![CDATA[" + Content + "]]></Content>" + 18                      "<FuncFlag>0</FuncFlag>" + 19                      "</xml>"; 20  21             return textpl; 22         }  文本消息

System.Web.HttpContext.Current.Response.Write(textpl); 我们将文本信息 返回给微信；

2.点击按钮

1 #region 微信菜单点击事件  2   3         /// <summary>  4         /// 微信菜单点击事件  5         /// </summary>  6         /// <param name="postStr">接受消息</param>  7         /// <returns></returns>  8         private void EventHandle(string postStr)  9         { 10             string responseContent = ""; 11             try 12             { 13                 System.Xml.XmlDocument xmldoc = new System.Xml.XmlDocument(); 14                 xmldoc.LoadXml(postStr); 15  16                 XmlNode Event = xmldoc.SelectSingleNode("/xml/Event"); 17                 XmlNode EventKey = xmldoc.SelectSingleNode("/xml/EventKey"); 18                 XmlNode ToUserName = xmldoc.SelectSingleNode("/xml/ToUserName"); 19                 XmlNode FromUserName = xmldoc.SelectSingleNode("/xml/FromUserName"); 20  21                 if (Event != null) 22                 { 23                     if (EventKey.InnerText.Equals("V1001_ORDER"))//EventKey.InnerText.Equals("V1001_ORDER") 就是创建菜单时，click按钮的唯一Key 24                     { 25                         responseContent = string.Format(Message_Text, 26                              FromUserName.InnerText, 27                              ToUserName.InnerText, 28                              DateTime.Now.Ticks, 29                              "您好，小萌为您服务，请回复十四位订单号，查询订单详情。");//生成文本消息 30                     } 31                         responseContent = type.ReceivedText(FromUserName.InnerText, ToUserName.InnerText, rebakcHtml); 32                     } 33                 } 34  35                 LogTextHelper.WriteLogToFile(responseContent + "------------------" + postStr); 36                 HttpContext.Current.Response.Write(responseContent);//返回给微信 37             } 38             catch (Exception ex) 39             { 40                 LogTextHelper.WriteLogToFile("微信菜单点击事件" + "||" + ex.ToString()); 41             } 42         } 43  44         /// <summary> 45         /// 普通文本消息 46         /// </summary> 47         public static string Message_Text 48         { 49             get 50             { 51                 return @"<xml>                              52                              <ToUserName><![CDATA[{0}]]></ToUserName>                              53                              <FromUserName><![CDATA[{1}]]></FromUserName> 54                              <CreateTime>{2}</CreateTime> 55                              <MsgType><![CDATA[text]]></MsgType> 56                              <Content><![CDATA[{3}]]></Content> 57                              </xml>"; 58             } 59         } 60  61         #endregion

3.接受消息：

接受消息 跟关注微信号有点类似：

消息内容

var keywordList = postObj.GetElementsByTagName("Content");

1 if (toMsgType == "text")//接口文本消息 toMsgType是消息类型 2     {  //ToDo 根据业务 处理消息内容 3    ｝ 4  else if (toMsgType == "event")//关注 5     { 6      if (toEvent == "subscribe") 7      { 8      ｝ 9 ｝ 

请点击我 --我爱足球