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("http://logs//"))) 
 Directory.CreateDirectory("http://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(); 
 } 
}