weixin _wx = new weixin();  string postStr = "";  if (Request.HttpMethod.ToLower() == "post")  {  Stream s = System.Web.HttpContext.Current.Request.InputStream;  byte[] b = new byte[s.Length];  s.Read(b, 0, (int)s.Length);  postStr = Encoding.UTF8.GetString(b);  if (!string.IsNullOrEmpty(postStr)) //请求处理  {  _wx.Handle(postStr);   }  }  else {  _wx.Auth();  }

/// <summary>  /// 微信公众平台操作类  /// </summary>  public class weixin  {  private string Token = "my_weixin_token"; //换成自己的token  public void Auth()  {  string echoStr = System.Web.HttpContext.Current.Request.QueryString["echoStr"];  if (CheckSignature()) //校验签名是否正确  {  if (!string.IsNullOrEmpty(echoStr))  {  System.Web.HttpContext.Current.Response.Write(echoStr); //返回原值表示校验成功  System.Web.HttpContext.Current.Response.End();  }  }  }    public void Handle(string postStr)  {  //封装请求类  XmlDocument doc = new XmlDocument();  doc.LoadXml(postStr);  XmlElement rootElement = doc.DocumentElement;  //MsgType  XmlNode MsgType = rootElement.SelectSingleNode("MsgType");  //接收的值--->接收消息类(也称为消息推送)  RequestXML requestXML = new RequestXML();  requestXML.ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText;  requestXML.FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText;  requestXML.CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText;  requestXML.MsgType = MsgType.InnerText;  //根据不同的类型进行不同的处理  switch (requestXML.MsgType)  {  case "text": //文本消息  requestXML.Content = rootElement.SelectSingleNode("Content").InnerText;  break;  case "image": //图片  requestXML.PicUrl = rootElement.SelectSingleNode("PicUrl").InnerText;  break;  case "location": //位置  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;  break;  case "link": //链接  break;  case "event": //事件推送 支持V4.5+  break;  }  //消息回复  ResponseMsg(requestXML);  }    /// <summary>  /// 验证微信签名  /// * 将token、timestamp、nonce三个参数进行字典序排序  /// * 将三个参数字符串拼接成一个字符串进行sha1加密  /// * 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信。  /// </summary>  /// <returns></returns>  private bool CheckSignature()  {  string signature = System.Web.HttpContext.Current.Request.QueryString["signature"];  string timestamp = System.Web.HttpContext.Current.Request.QueryString["timestamp"];  string nonce = System.Web.HttpContext.Current.Request.QueryString["nonce"];  //加密/校验流程：  //1. 将token、timestamp、nonce三个参数进行字典序排序  string[] ArrTmp = { Token, timestamp, nonce };   Array.Sort(ArrTmp);//字典排序  //2.将三个参数字符串拼接成一个字符串进行sha1加密  string tmpStr = string.Join("", ArrTmp);  tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");  tmpStr = tmpStr.ToLower();  //3.开发者获得加密后的字符串可与signature对比，标识该请求来源于微信。  if (tmpStr == signature)  {  return true;  }  else {  return false;  }  }  /// <summary>  /// 消息回复(微信信息返回)  /// </summary>  /// <param name="requestXML">The request XML.</param>  private void ResponseMsg(RequestXML requestXML)  {  try {  string resxml = "";  //主要是调用数据库进行关键词匹配自动回复内容，可以根据自己的业务情况编写。  //1.通常有，没有匹配任何指令时，返回帮助信息  AutoResponse mi = new AutoResponse(requestXML.Content, requestXML.FromUserName);  switch (requestXML.MsgType)  {  case "text":  //在这里执行一系列操作，从而实现自动回复内容.   string _reMsg = mi.GetReMsg();  if (mi.msgType == 1)  {  resxml = "<xml><ToUserName><![CDATA[" + requestXML.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + requestXML.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[news]]></MsgType><Content><![CDATA[]]></Content><ArticleCount>2</ArticleCount><Articles>";  resxml += mi.GetRePic(requestXML.FromUserName);  resxml += "</Articles><FuncFlag>1</FuncFlag></xml>";  }  else {  resxml = "<xml><ToUserName><![CDATA[" + requestXML.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + requestXML.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[" + _reMsg + "]]></Content><FuncFlag>1</FuncFlag></xml>";  }  break;  case "location":  string city = GetMapInfo(requestXML.Location_X, requestXML.Location_Y);  if (city == "0")  {  resxml = "<xml><ToUserName><![CDATA[" + requestXML.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + requestXML.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[好啦，我们知道您的位置啦。您可以:" + mi.GetDefault() + "]]></Content><FuncFlag>1</FuncFlag></xml>";  }  else {  resxml = "<xml><ToUserName><![CDATA[" + requestXML.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + requestXML.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[好啦，我们知道您的位置啦。您可以:" + mi.GetDefault() + "]]></Content><FuncFlag>1</FuncFlag></xml>";  }  break;  case "image":  //图文混合的消息 具体格式请见官方API“回复图文消息”   break;  }  System.Web.HttpContext.Current.Response.Write(resxml);  WriteToDB(requestXML, resxml, mi.pid);  }  catch (Exception ex)  {  //WriteTxt("异常：" + ex.Message + "Struck:" + ex.StackTrace.ToString());  //wx_logs.MyInsert("异常：" + ex.Message + "Struck:" + ex.StackTrace.ToString());  }  }    /// <summary>  /// unix时间转换为datetime  /// </summary>  /// <param name="timeStamp"></param>  /// <returns></returns>  private DateTime UnixTimeToTime(string timeStamp)  {  DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));  long lTime = long.Parse(timeStamp + "0000000");  TimeSpan toNow = new TimeSpan(lTime);  return dtStart.Add(toNow);  }    /// <summary>  /// datetime转换为unixtime  /// </summary>  /// <param name="time"></param>  /// <returns></returns>  private int ConvertDateTimeInt(System.DateTime time)  {  System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));  return (int)(time - startTime).TotalSeconds;  }    /// <summary>  /// 调用百度地图，返回坐标信息  /// </summary>  /// <param name="y">经度</param>  /// <param name="x">纬度</param>  /// <returns></returns>  public string GetMapInfo(string x, string y)  {  try {  string res = string.Empty;  string parame = string.Empty;  string url = "http://maps.googleapis.com/maps/api/geocode/xml";  parame = "latlng=" + x + "," + y + "&language=zh-CN&sensor=false";//此key为个人申请  res = webRequestPost(url, parame);  XmlDocument doc = new XmlDocument();  doc.LoadXml(res);  XmlElement rootElement = doc.DocumentElement;  string Status = rootElement.SelectSingleNode("status").InnerText;  if (Status == "OK")  {  //仅获取城市  XmlNodeList xmlResults = rootElement.SelectSingleNode("/GeocodeResponse").ChildNodes;  for (int i = 0; i < xmlResults.Count; i++)  {  XmlNode childNode = xmlResults[i];  if (childNode.Name == "status") {  continue;  }  string city = "0";  for (int w = 0; w < childNode.ChildNodes.Count; w++)  {  for (int q = 0; q < childNode.ChildNodes[w].ChildNodes.Count; q++)  {  XmlNode childeTwo = childNode.ChildNodes[w].ChildNodes[q];  if (childeTwo.Name == "long_name")  {  city = childeTwo.InnerText;  }  else if (childeTwo.InnerText == "locality")  {  return city;  }  }  }  return city;  }  }  }  catch (Exception ex)  {  //WriteTxt("map异常:" + ex.Message.ToString() + "Struck:" + ex.StackTrace.ToString());  return "0";  }   return "0";  }    /// <summary>  /// Post 提交调用抓取  /// </summary>  /// <param name="url">提交地址</param>  /// <param name="param">参数</param>  /// <returns>string</returns>  public string webRequestPost(string url, string param)  {  byte[] bs = System.Text.Encoding.UTF8.GetBytes(param);  HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url + "?" + param);  req.Method = "Post";  req.Timeout = 120 * 1000;  req.ContentType = "application/x-www-form-urlencoded;";  req.ContentLength = bs.Length;  using (Stream reqStream = req.GetRequestStream())  {  reqStream.Write(bs, 0, bs.Length);  reqStream.Flush();  }  using (WebResponse wr = req.GetResponse())  {  //在这里对接收到的页面内容进行处理  Stream strm = wr.GetResponseStream();  StreamReader sr = new StreamReader(strm, System.Text.Encoding.UTF8);  string line;  System.Text.StringBuilder sb = new System.Text.StringBuilder();  while ((line = sr.ReadLine()) != null)  {  sb.Append(line + System.Environment.NewLine);  }  sr.Close();  strm.Close();  return sb.ToString();  }  }  /// <summary>  /// 将本次交互信息保存至数据库中  /// </summary>  /// <param name="requestXML"></param>  /// <param name="_xml"></param>  /// <param name="_pid"></param>  private void WriteToDB(RequestXML requestXML, string _xml, int _pid)  {  WeiXinMsg wx = new WeiXinMsg();  wx.FromUserName = requestXML.FromUserName;  wx.ToUserName = requestXML.ToUserName;  wx.MsgType = requestXML.MsgType;  wx.Msg = requestXML.Content;  wx.Creatime = requestXML.CreateTime;  wx.Location_X = requestXML.Location_X;  wx.Location_Y = requestXML.Location_Y;  wx.Label = requestXML.Label;  wx.Scale = requestXML.Scale;  wx.PicUrl = requestXML.PicUrl;  wx.reply = _xml;  wx.pid = _pid;  try {  wx.Add();  }  catch (Exception ex)  {  //wx_logs.MyInsert(ex.Message);  //ex.message;  }  }  }

#region 微信请求类 RequestXML  /// <summary>  /// 微信请求类  /// </summary>  public class RequestXML  {  private string toUserName = "";  /// <summary>  /// 消息接收方微信号，一般为公众平台账号微信号  /// </summary>  public string ToUserName  {  get { return toUserName; }  set { toUserName = value; }  }  private string fromUserName = "";  /// <summary>  /// 消息发送方微信号  /// </summary>  public string FromUserName  {  get { return fromUserName; }  set { fromUserName = value; }  }  private string createTime = "";  /// <summary>  /// 创建时间  /// </summary>  public string CreateTime  {  get { return createTime; }  set { createTime = value; }  }  private string msgType = "";  /// <summary>  /// 信息类型 地理位置:location,文本消息:text,消息类型:image  /// </summary>  public string MsgType  {  get { return msgType; }  set { msgType = value; }  }  private string content = "";  /// <summary>  /// 信息内容  /// </summary>  public string Content  {  get { return content; }  set { content = value; }  }  private string location_X = "";  /// <summary>  /// 地理位置纬度  /// </summary>  public string Location_X  {  get { return location_X; }  set { location_X = value; }  }  private string location_Y = "";  /// <summary>  /// 地理位置经度  /// </summary>  public string Location_Y  {  get { return location_Y; }  set { location_Y = value; }  }  private string scale = "";  /// <summary>  /// 地图缩放大小  /// </summary>  public string Scale  {  get { return scale; }  set { scale = value; }  }  private string label = "";  /// <summary>  /// 地理位置信息  /// </summary>  public string Label  {  get { return label; }  set { label = value; }  }  private string picUrl = "";  /// <summary>  /// 图片链接，开发者可以用HTTP GET获取  /// </summary>  public string PicUrl  {  get { return picUrl; }  set { picUrl = value; }  }  }  #endregion