微信公众平台开发之发送文本消息.Net代码解析

.net实现微信公共服务平台开发中的发送文本消息功能，具体内容如下

首先建立一个微信消息类。 

 class wxmessage 
 { 
  public string fromusername { get; set; } 
  public string tousername { get; set; } 
  public string msgtype { get; set; } 
  public string eventname { get; set; } 
  public string content { get; set; }
  public string eventkey { get; set; } 
 } 

 后台代码如下： 

protected void page_load(object sender, eventargs e)
  {
   wxmessage wx = getwxmessage();
   string res = "";

   if (!string.isnullorempty(wx.eventname) && wx.eventname.trim() == "subscribe")
   {//刚关注时的时间，用于欢迎词
    string content = "";
    content = "/:rose欢迎北京永杰友信科技有限公司/:rose\n直接回复“你好”";
    res = sendtextmessage(wx, content);
   }
   else
   {
    if (wx.msgtype == "text" && wx.content == "你好")
    {
     res = sendtextmessage(wx, "你好,欢迎使用北京永杰友信科技有限公司公共微信平台!");
    }
    else
    {
     res = sendtextmessage(wx, "你好,未能识别消息!");
    }
   }

   response.write(res);
  }

 private wxmessage getwxmessage()
  {
   wxmessage wx = new wxmessage();
   streamreader str = new streamreader(request.inputstream, system.text.encoding.utf8);
   xmldocument xml = new xmldocument();
   xml.load(str);
   wx.tousername = xml.selectsinglenode("xml").selectsinglenode("tousername").innertext;
   wx.fromusername = xml.selectsinglenode("xml").selectsinglenode("fromusername").innertext;
   wx.msgtype = xml.selectsinglenode("xml").selectsinglenode("msgtype").innertext;
   if (wx.msgtype.trim() == "text")
   {
    wx.content = xml.selectsinglenode("xml").selectsinglenode("content").innertext;
   }
   if (wx.msgtype.trim() == "event")
   {
    wx.eventname = xml.selectsinglenode("xml").selectsinglenode("event").innertext;
   }

   
   return wx;
  }

/// 
  /// 发送文字消息 
  /// 
  /// 获取的收发者信息 
  /// 内容 
  /// 
  private string sendtextmessage(wxmessage wx, string content)
  {
   string res = string.format(@" ",
    wx.fromusername, wx.tousername, datetime.now, content);
   return res;
  }

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