/// <summary>
        /// 下单
        /// </summary>
        private void PlaceAnOrder()
        {
            if (Order.orderStatus == "0")
            {
                string body = "test_body";
                foreach (var item in Order.goodsList)
                {
                    body += item.productName + "//";
                }

                //string out_trade_no = "DJ" + DateTime.Now.ToString("yyyyMMddhhmmss");
                string out_trade_no = Order.orderId.ToString();
                string product_code = "QUICK_MSECURITY_PAY";
                string subject      = "美而好家具";
                string total_amount = Order.orderTotal.ToString("0.00");

                JObject json = new JObject();
                json.Add("body", body);
                json.Add("out_trade_no", out_trade_no);
                json.Add("product_code", product_code);
                json.Add("subject", subject);
                json.Add("total_amount", total_amount);

                string  con    = _restSharpService.GetAliPaySign(json.ToString());
                JObject result = JObject.Parse(con);
                string  sign   = result["data"].ToString();

                MessagingCenter.Send(new object(), "Pay", sign);

                //CrossToastPopUp.Current.ShowToastMessage("支付成功", ToastLength.Long);
                //PayWebPage payWebPage = new PayWebPage();
                //Application.Current.MainPage.Navigation.PushModalAsync(payWebPage);
            }
        }