//判断是否网页授权，获取授权code,没有代表没有授权，构造网页授权获取code,并重新请求
      if (string.IsNullOrEmpty(Request.QueryString["code"]))
      {
        string redirectUrl = _weChatPaySerivce.GetAuthorizeUrl(account.AppId, account.RedquestUrl,
          "STATE" + "#wechat_redirect", "snsapi_base");
        return Redirect(redirectUrl);
      }

public string GetAuthorizeUrl(string appId, string redirectUrl, string state, string scope)
    {
      string url = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope={2}&state={3}",
          appId, HttpUtility.UrlEncode(redirectUrl), scope, state);
      /* 这一步发送之后，客户会得到授权页面，无论同意或拒绝，都会返回redirectUrl页面。
       * 如果用户同意授权，页面将跳转至 redirect_uri/?code=CODE&state=STATE。这里的code用于换取access_token（和通用接口的access_token不通用）
       * 若用户禁止授权，则重定向后不会带上code参数，仅会带上state参数redirect_uri?state=STATE
       */
      AppLog.Write("获取到授权url:", AppLog.LogMessageType.Debug); 
      return url;
    }

 public Tuple<string, string> GetOpenidAndAccessTokenFromCode(string appId, string code, string appSecret)
    {
      Tuple<string, string> tuple = null;
      try
      {
        string url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appId, appSecret, code);
        string result = WeChatPayHelper.Get(url);
        AppLog.Write("微信支付-获取openid和access_token 请求Url:" + url + "result:" + result, AppLog.LogMessageType.Debug);
        if (!string.IsNullOrEmpty(result))
        {
          var jd=Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, string>>(result);
          tuple = new Tuple<string, string>(jd["openid"],jd["access_token"]);
          AppLog.Write("微信支付-获取openid和access_token成功", AppLog.LogMessageType.Debug);
        }
      }
      catch (Exception ex)
      {
        AppLog.Write("微信支付：获取openid和access_tokenu异常", AppLog.LogMessageType.Debug,ex);
      }
      return tuple;
    }

//创建支付应答对象
      RequestHandler packageReqHandler = new RequestHandler(null);
      //初始化
      packageReqHandler.Init();
      //时间戳
      string timeStamp = TenPayUtil.GetTimestamp();
      //随机字符串
      string nonceStr = TenPayUtil.GetNoncestr();
      //设置package订单参数 生成prepayId预支付Id
      packageReqHandler.SetParameter("appid", account.AppId);     //公众账号ID
      packageReqHandler.SetParameter("mch_id", account.PartnertId);     //商户号
      packageReqHandler.SetParameter("nonce_str", nonceStr);          //随机字符串
      packageReqHandler.SetParameter("body", account.Body);
      packageReqHandler.SetParameter("out_trade_no", account.OrderSerialId);    //商家订单号
      packageReqHandler.SetParameter("total_fee", account.TotalAmount);          //商品金额,以分为单位(money * 100).ToString()
      packageReqHandler.SetParameter("spbill_create_ip", account.RequestIp);  //用户的公网ip，不是商户服务器IP
      packageReqHandler.SetParameter("notify_url", account.NotifyUrl);      //接收财付通通知的URL
      packageReqHandler.SetParameter("trade_type", "JSAPI");            //交易类型
      packageReqHandler.SetParameter("openid", account.OpenId);            //用户的openId
      string sign = packageReqHandler.CreateMd5Sign("key", account.PaySignKey);
      packageReqHandler.SetParameter("sign", sign);            //签名
      string prepayId = string.Empty;
      try
      {
        string data = packageReqHandler.ParseXML();
        var result = TenPayV3.Unifiedorder(data);
        MailHelp.SendMail("调用统一下单接口，下单结果：--"+result+"请求参数："+data);
        var res = XDocument.Parse(result);
        prepayId = res.Element("xml").Element("prepay_id").Value;
        AppLog.Write("调用统一下单接口获取预支付prepayId成功", AppLog.LogMessageType.Debug);
      }
      catch (Exception ex)
      {
        AppLog.Write("获取到openid和access_tokenu异常", AppLog.LogMessageType.Debug, ex);
        MailHelp.SendMail("调用统一下单接口获取预支付prepayid异常：", ex);
        return null;
      }

//生成JsAPI支付参数
      RequestHandler paySignReqHandler = new RequestHandler(null);
      paySignReqHandler.SetParameter("appId", account.AppId);
      paySignReqHandler.SetParameter("timeStamp", timeStamp);
      paySignReqHandler.SetParameter("nonceStr", nonceStr);
      paySignReqHandler.SetParameter("package", string.Format("prepay_id={0}", prepayId));
      paySignReqHandler.SetParameter("signType", "MD5");
      string paySign = paySignReqHandler.CreateMd5Sign("key", account.PaySignKey);
      WeChatJsPayRequestModel resultModel = new WeChatJsPayRequestModel
      {
        AppId = account.AppId,
        NonceStr = nonceStr,
        TimeStamp = timeStamp,
        Package = string.Format("prepay_id={0}", prepayId),
        PaySign = paySign,
        SignType = "MD5"
      };

private string CreateWeixinJs(WeChatJsPayRequestModel model)
    {
      string js = @"<script type='text/javascript'>
                callpay();
                function jsApiCall(){
                 WeixinJSBridge.invoke(
                  'getBrandWCPayRequest', {
                    requestParam
                  },
                  function (res) {
                    if(res.err_msg == 'get_brand_wcpay_request:ok' ){
                        window.location.href = 'successUrl';
                    }else{
                        window.location.href = 'failUrl';
                    }
                  }
                 ); 
                }
               function callpay()
                {
                  if (typeof WeixinJSBridge == 'undefined'){
                    if( document.addEventListener ){
                      document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);
                    }else if (document.attachEvent){
                      document.attachEvent('WeixinJSBridgeReady', jsApiCall); 
                      document.attachEvent('onWeixinJSBridgeReady', jsApiCall);
                    }
                  }else{
                    jsApiCall();
                  }
                }
            </script>";
      string requestParam = string.Format(@"'appId': '{0}','timeStamp': '{1}','nonceStr': '{2}','package': '{3}','signType': '{4}','paySign': '{5}'",
        model.AppId, model.TimeStamp, model.NonceStr, model.Package, model.SignType, model.PaySign);
      js = js.Replace("requestParam", requestParam)
        .Replace("successUrl", model.JumpUrl + "&result=1")
        .Replace("failUrl", model.JumpUrl + "&result=0");
      AppLog.Write("生成可执行脚本成功", AppLog.LogMessageType.Debug);
      return js;
    }

ResponseHandler resHandler = new ResponseHandler(System.Web.HttpContext.Current);
      bool isSuccess = _weChatPaySerivce.ProcessNotify(resHandler);
      if (isSuccess)
      {
        string result = @"<xml>
                  <return_code><![CDATA[SUCCESS]]></return_code>
                  <return_msg><![CDATA[支付成功]]></return_msg>
                 </xml>";
        HttpContext.Response.Write(result);
        HttpContext.Response.End();
      }
      return new EmptyResult();