.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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