微信公共服务平台开发（.Net 的实现）1-------认证“成为开发者”

这些代码也就开始认证的时候用一次，以后就不用了：

     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();
         }
     }     

     /// 
     /// 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。
     /// 
     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();
             }
         }
     }     


     /// 
     /// 写日志(用于跟踪)
     /// 
     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();
         }
     }