/// <summary>
        /// 生成统一下单交易数据包(为pc端网页扫码模式)
        /// </summary>
        /// <param name="orderId"></param>
        /// <param name="money"></param>
        /// <param name="body"></param>
        /// <param name="notifyUrl"></param>
        /// <param name="expire"></param>
        /// <param name="userOpenId">用户openid</param>
        /// <param name="ip"></param>
        private string genPrePay4Qrcode(string orderId, decimal money, string body, string notifyUrl, DateTime expire, string ip)
        {
            string noncestr = Guid.NewGuid().ToString().Replace("-", ""); //32 位内的随机串,防重发
            var    param    = new SortedDictionary <string, object>();

            param.Add("appid", config.AppId);
            param.Add("mch_id", config.MerchantId);
            param.Add("nonce_str", noncestr);
            param.Add("device_info", "WEB");
            param.Add("body", body);
            param.Add("out_trade_no", orderId);
            param.Add("total_fee", Convert.ToInt32(Math.Round(money * 100, 0))); //订单总金额,单位为分
            param.Add("spbill_create_ip", ip);
            param.Add("notify_url", notifyUrl);
            param.Add("product_id", orderId);
            param.Add("trade_type", "NATIVE");
            if (expire != DateTime.MinValue)
            {
                param.Add("time_expire", expire.ToString("yyyyMMddHHmmss"));
            }

            //生成签名
            string signString = WxpayCore.CreateLinkString(param) + "&key=" + config.MerchantKey;
            string packSign   = WxpayCore.MD5(signString, Encoding.UTF8);

            param.Add("sign", packSign);

            return(WxpayCore.ToXml(param));
        }
        /// <summary>
        /// 生成订单查询XML
        /// </summary>
        /// <param name="orderId"></param>
        private string generateOrderQueryByOrderId(string orderId)
        {
            string noncestr = Guid.NewGuid().ToString().Replace("-", ""); //32 位内的随机串,防重发
            var    param    = new SortedDictionary <string, object>();

            param.Add("appid", config.AppId);
            param.Add("mch_id", config.MerchantId);
            param.Add("nonce_str", noncestr);
            param.Add("out_trade_no", orderId);

            //生成签名
            string signString = WxpayCore.CreateLinkString(param) + "&key=" + config.MerchantKey;
            string packSign   = WxpayCore.MD5(signString, Encoding.UTF8);

            param.Add("sign", packSign);

            return(WxpayCore.ToXml(param));
        }