微信开发之（一）微信验证

 //在ProcessRequest方法里面写上如下代码：
 if (HttpContext.Current.Request.HttpMethod.ToUpper() == "POST")
     {
              //do something
    }else{

           AuthWechat(); //采用GET方法判断进入验证方法
    } 
        ///认证微信
        private void AuthWechat()
        {
            string token = "testweixin";//Token的值
     
            string echoString = HttpContext.Current.Request.QueryString["echoStr"];
            string signature = HttpContext.Current.Request.QueryString["signature"];
            string timestamp = HttpContext.Current.Request.QueryString["timestamp"];
            string nonce = HttpContext.Current.Request.QueryString["nonce"];

            if (CheckSignature(token, signature, timestamp, nonce))
            {
                if (!string.IsNullOrEmpty(echoString))
                {
                    HttpContext.Current.Response.Write(echoString);
                    HttpContext.Current.Response.End();
                }
            }

        }

        /// <summary>
        /// 对微信传入参数进行封装到数组，拼接字符串，进行加密操作
        /// </summary>
        private bool CheckSignature(string token, string signature, string timestamp, string nonce)
        {
            string[] ArrTmp = { token, timestamp, nonce };//将参数放进数组

            Array.Sort(ArrTmp);//对数组进行排序

            string tmpStr = string.Join("", ArrTmp);//将数组进行拼接

            ///对拼接后的字符串进行加密操作
           // tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");

            tmpStr=Membership.CreateUser(tmpStr, "SHA1").ToString();

            //转换成小写形式
            tmpStr = tmpStr.ToLower();

            //比对成功返回
            if (tmpStr == signature)
            {
                return true;
            }
            else
            {
                return false;
            }
        }