微信公共平臺中涉及到地理位置的有兩種情況:
        第一、我發送一個自選的地理位置給微信，然后微信可以自動反饋響應的信息。
        第二、讓微信獲取我們GPS定位地址位置，反饋響應的信息。 
       首先我們先來看第一種，在微信中除了可以發文本，圖片，語音等還有一個信息就是地理位置，按照微信接受地理信息的XML信息，我們需要改造一下之前的wxmessage類加上幾個屬性： 

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 Recognition { get; set; }    public string MediaId { get; set; }    public string EventKey { get; set; }     public string Location_X { get; set; }    public string Location_Y { get; set; }    public string Scale { get; set; }    public string Label { get; set; }  }    其中Location_X代表緯度，Location_Y代表經度，Scale代表縮放比例，Label代表位置的描述    和接受文本，語音消息一下樣，地理信息的MsgType為“location”，修改一下之前的GetWxMessage()函數和OnLoad里面的消息處理： 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() == "location")     {       wx.Location_X = xml.SelectSingleNode("xml").SelectSingleNode("Location_X").InnerText;       wx.Location_Y = xml.SelectSingleNode("xml").SelectSingleNode("Location_Y").InnerText;       wx.Scale = xml.SelectSingleNode("xml").SelectSingleNode("Scale").InnerText;       wx.Label = xml.SelectSingleNode("xml").SelectSingleNode("Label").InnerText;     }     if (wx.MsgType.Trim() == "event")     {       wx.EventName = xml.SelectSingleNode("xml").SelectSingleNode("Event").InnerText;       wx.EventKey = xml.SelectSingleNode("xml").SelectSingleNode("EventKey").InnerText;     }     if (wx.MsgType.Trim() == "voice")     {       wx.Recognition = xml.SelectSingleNode("xml").SelectSingleNode("Recognition").InnerText;     }          return wx;   }  protected void Page_Load(object sender, EventArgs e)   {     wxmessage wx = GetWxMessage();     string res = "";     if (!string.IsNullOrEmpty(wx.EventName) && wx.EventName.Trim() == "subscribe")     {       string content = "";       if (!wx.EventKey.Contains("qrscene_"))       {         content = "/:rose歡迎北京永杰友信科技有限公司/:rose/n直接回復“你好”";         res = sendTextMessage(wx, content);       }       else       {         content = "二維碼參數：/n" + wx.EventKey.Replace("qrscene_", "");         res = sendTextMessage(wx, content);       }     }     else if (!string.IsNullOrEmpty(wx.EventName) && wx.EventName.ToLower() == "scan")     {       string str = "二維碼參數：/n" + wx.EventKey;       res = sendTextMessage(wx, str);     }     else if (!string.IsNullOrEmpty(wx.EventName) && wx.EventName.Trim() == "CLICK")     {       if(wx.EventKey=="HELLO")         res = sendTextMessage(wx, "你好,歡迎使用北京永杰友信科技有限公司公共微信平臺!");     }     else     {       WriteLog(wx.MsgType);       if (wx.MsgType == "text" && wx.Content == "你好")       {         res = sendTextMessage(wx, "你好,歡迎使用北京永杰友信科技有限公司公共微信平臺!");       }       else if (wx.MsgType == "voice")       {         res = sendTextMessage(wx, wx.Recognition);       }       else if (wx.MsgType == "location")       {         res = sendTextMessage(wx, "您發送的位置是:" + wx.Label + ";緯度是:" + wx.Location_X + ";經度是:" + wx.Location_Y + ";縮放比例為:" + wx.Scale);       }       else       {         res = sendTextMessage(wx, "你好,未能識別消息!");       }     }     Response.Write(res);   }