private string createBill(string openId, PaymentParam paymentParam) { PaymentDao pDao = new PaymentDao(); string pre = DateTime.Now.ToString("yyyyMMddHHmm"); string billId = pre + "XC" + TenPayV3Util.BuildRandomStr(4); if (pDao.saveOrder(openId, billId, paymentParam)) { return(billId); } else { throw new ApiException(CodeMessage.InitOrderError, "InitOrderError"); } }