I generated my trade system with IB API and C#.
I'm wondering whether is there a function to get the open/filled orders' orderId?
The IBApi.EClient.reqOpenOrders method allows to obtain all active orders submitted by the client application
client.reqOpenOrders();
or
client.reqAllOpenOrders();
results will be received in EWrapper with orderId and permId
void openOrder(int orderId, Contract contract, Order order, OrderState orderState);
in the end of execution you will hit void openOrderEnd();
method in your wrapper
documentation: https://interactivebrokers.github.io/tws-api/open_orders.html