/// <summary>
    /// Post 的摘要說明
    /// </summary>
    public class Post : IHttpHandler
    {
        WXCore m_wxCore = new WXCore();

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/xml;charset=utf-8";
            //context.Response.Write("Hello World"); 打印出這一句，會造成配置不成功
 

            if (context.Request.HttpMethod.ToLower() == "post")
            {

            }
            else
            {
                m_wxCore.Auth();
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
 

public void Auth()
        {
            string echoStr = HttpContext.Current.Request.QueryString["echostr"];
            if (CheckSignature()) //校驗簽名是否正確
            {
                if (!string.IsNullOrEmpty(echoStr))
                {
                    HttpContext.Current.Response.Write(echoStr); //返回原值表示校驗成功
 

                    HttpContext.Current.Response.End();
                }
            }
        }

        /// <summary>
        /// 驗證微信簽名
        /// * 將token、timestamp、nonce三個引數進行字典序排序
        /// * 將三個引數字串拼接成一個字串進行sha1加密
        /// * 開發者獲得加密後的字串可與signature對比，標識該請求來源於微信。
        /// </summary>
        /// <returns></returns>
        private bool CheckSignature()
        {
            string signature = HttpContext.Current.Request.QueryString["signature"];
            string timestamp = HttpContext.Current.Request.QueryString["timestamp"];
            string nonce = HttpContext.Current.Request.QueryString["nonce"];
            //加密/校驗流程：
            //1. 將token、timestamp、nonce三個引數進行字典序排序
            string[] ArrTmp = { ConfigHelper.Token, timestamp, nonce };
            Array.Sort(ArrTmp);//字典排序
            //2.將三個引數字串拼接成一個字串進行sha1加密
            string tmpStr = string.Join("", ArrTmp);
            tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");
            tmpStr = tmpStr.ToLower();
            //3.開發者獲得加密後的字串可與signature對比，標識該請求來源於微信。
            if (tmpStr == signature)
            {
                return true;
            }
            else
            {
                return false;
            }
        }