微信公众账号token验证失败解决办法

using System;using System.Web.Security;using System.Web.UI;using WxPayAPI;namespace Alipay{    public partial class wx_token : Page    {        /// <summary>        /// 要与基本配置中的Token一致        /// </summary>        public string Token = "Token";        PRotected void Page_Load(object sender, EventArgs e)        {            string echoStr = Request.QueryString["echoStr"];            Log.Debug("Token", "测试输出: echoStr = " + echoStr);            if ( CheckSignature() && !string.IsNullOrEmpty(echoStr))            {                Response.Write(echoStr);                Response.End();            }        }        /// <summary>        /// 验证微信签名        /// </summary>        /// * 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。        /// <returns></returns>        private bool CheckSignature()        {            string signature = Request.QueryString["signature"];            string timestamp = Request.QueryString["timestamp"];            string nonce = Request.QueryString["nonce"];            Log.Debug("Token", "测试输出: signature = " + signature);            Log.Debug("Token", "测试输出: timestamp = " + timestamp);            Log.Debug("Token", "测试输出: nonce = " + nonce);            string[] arrTmp = { Token, timestamp, nonce };            Array.Sort(arrTmp);            string tmpStr = string.Join("", arrTmp);            tmpStr = FormsAuthentication.HashPassWordForStoringInConfigFile(tmpStr, "SHA1");            if (tmpStr != null)            {                tmpStr = tmpStr.ToLower();                return tmpStr == signature;            }            return false;        }    }}