public void ProcessRequest(HttpContext context)
        {
            if (string.IsNullOrEmpty(context.Request.QueryString["echostr"]))
            {
                context.Response.End();
            }

            #region --------验证URL

            WXBizMsgCrypt wxcpt            = new WXBizMsgCrypt(WXToken, sEncodingAESKey, sCorpID);
            string        sVerifyMsgSig    = HttpUtility.UrlDecode(context.Request.QueryString["msg_signature"].ToString());
            string        sVerifyTimeStamp = HttpUtility.UrlDecode(context.Request.QueryString["timestamp"].ToString());
            string        sVerifyNonce     = HttpUtility.UrlDecode(context.Request.QueryString["nonce"].ToString());
            string        sVerifyEchoStr   = HttpUtility.UrlDecode(context.Request.QueryString["echostr"].ToString());
            int           ret      = 0;
            string        sEchoStr = "";
            ret = wxcpt.VerifyURL(sVerifyMsgSig, sVerifyTimeStamp, sVerifyNonce, sVerifyEchoStr, ref sEchoStr);
            Log.WriteLog("\n" + sEchoStr);
            if (ret != 0)
            {
                Log.WriteLog("ERR: VerifyURL fail, ret: " + ret);
                return;
            }
            else
            {
                context.Response.Write(sEchoStr);
                context.Response.End();
            }
            //return;
            #endregion

            if (WeiXin.CheckSignature(sVerifyMsgSig, sVerifyTimeStamp, sVerifyNonce, WXToken))
            {
                try
                {
                    var replyMsg = WeiXin.ReplyMsg().GetXML();
                    //这里可以记录日志
                    Log.WriteLog(replyMsg);
                    context.Response.Write(replyMsg);
                }
                catch (Exception exp)
                {
                    //记录异常
                    Log.WriteLog("error");
                }
            }
            else
            {
                context.Response.Write("");
            }
        }