private OrderId GetOrderId(QuickFix.FIX44.Message message) { var brokerOrderId = message.GetField(Tags.OrderID); if (this.orderIdIndex.TryGetValue(brokerOrderId, out var orderId)) { return(orderId); } var newOrderId = new OrderId(message.GetField(Tags.ClOrdID)); this.orderIdIndex[brokerOrderId] = newOrderId; return(newOrderId); }