internal OrderBill(decimal orderId) { this.OrderId = orderId; _mainPayBillLoader = new LazyLoader <NormalPayBill>(() => DistributionQueryService.QueryNormalPayBill(this.OrderId)); _postponePayBillsLoader = new EnumerableLazyLoader <PostponePayBill>(() => DistributionQueryService.QueryPostponePayBills(this.OrderId)); }