const string Token = "XXXXX";//你的token protected void Page_Load(object sender, EventArgs e) {   string postStr = "";   if (Request.HttpMethod.ToLower() == "post")   {     System.IO.Stream s = System.Web.HttpContext.Current.Request.InputStream;     byte[] b = new byte[s.Length];     s.Read(b, 0, (int)s.Length);     postStr = System.Text.Encoding.UTF8.GetString(b);     if (!string.IsNullOrEmpty(postStr))     {       //ResponseMsg(postStr);       Response.Write(ResponseMsg(postStr));       Response.End();     }    //WriteLog("postStr:" + postStr);   }   else   {     Valid();   } }     /// <summary> /// 驗證微信簽名 /// </summary> /// * 將token、timestamp、nonce三個參數進行字典序排序 /// * 將三個參數字符串拼接成一個字符串進行sha1加密 /// * 開發者獲得加密后的字符串可與signature對比，標識該請求來源于微信。 /// <returns></returns> private bool CheckSignature() {   string signature = Request.QueryString["signature"].ToString();   string timestamp = Request.QueryString["timestamp"].ToString();   string nonce = Request.QueryString["nonce"].ToString();   string[] ArrTmp = { Token, timestamp, nonce };   Array.Sort(ArrTmp);   //字典排序   string tmpStr = string.Join("", ArrTmp);   tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");   tmpStr = tmpStr.ToLower();   if (tmpStr == signature)   {     return true;   }   else   {     return false;   } } .private void Valid() {   string echoStr = Request.QueryString["echoStr"].ToString();   if (CheckSignature())   {     if (!string.IsNullOrEmpty(echoStr))     {       Response.Write(echoStr);       Response.End();     }   } }     /// <summary> /// 寫日志(用于跟蹤) /// </summary> private void WriteLog(string strMemo) {   string filename = Server.MapPath("/logs/log.txt");   if (!Directory.Exists(Server.MapPath("//logs//")))     Directory.CreateDirectory("//logs//");   StreamWriter sr = null;   try   {     if (!File.Exists(filename))     {       sr = File.CreateText(filename);     }     else     {       sr = File.AppendText(filename);     }     sr.WriteLine(strMemo);   }   catch   {    }   finally   {     if (sr != null)       sr.Close();   } }