// GET: Common
        /// <summary>
        ///  微信小程序模板校验签名
        /// </summary>
        /// <returns></returns>
        [System.Web.Http.HttpGet]
        public void  CheckSignature(string signature, string timestamp, string nonce, string echostr)
        {
            var token = ConfigurationManager.AppSettings["Token"];
            string[] ArrTmp = { token, timestamp, nonce };

            Array.Sort(ArrTmp);
            string tmpStr = string.Join("", ArrTmp);

            tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");
            tmpStr = tmpStr.ToLower();

            if (tmpStr == signature)
            {
                HttpContext.Current.Response.Write(echostr);
                HttpContext.Current.Response.End();
            }
            HttpContext.Current.Response.Write("校验失败");
            HttpContext.Current.Response.End();
        }