Why IOrder may be == NULL?

[alex.nt]

The quote from help
// Remember to check the underlying IOrder object for null before trying to access its properties
if (execution.Order != null && execution.Order.OrderState == OrderState.Filled)
Print(execution.ToString());

Well, OK, but how come execution.Order may be NULL? Does it mean that the signal comes from another chart/strategy?

What kind of the situation is that? Ignorable, important, critical?

Thanks

[NinjaTrader_Joydeep]

Hello alex.nt,
Please refer to this thread where there is already an detailed discussion pertaining to this subject http://www.ninjatrader.com/support/f...rder+reference

Please do let me know if I can be of any further help.

Regards,
Joydeep.

[alex.nt]

Thank you Joy,

I must admit that I did not get the answer on "why IOrder may be NULL" from that thread.

Would you mind to shed a light on it?

Thank you

[NinjaTrader_Bertrand]

Alex, in the more general case and IOrder object would be null when you start using it, it would have no assigned value and if you then would try accessing any of it's properties you would see an object reference error. IOrder objects are set in your code and once they reach terminal state (like fill / cancellation) you would reset / nullify them so you could reuse them on the next action. So for working with them it's very important to check for them not being null before attempting to access any properties.

[koganam]

Thank you Joy,

I must admit that I did not get the answer on "why IOrder may be NULL" from that thread.

Would you mind to shed a light on it?

Thank you

The last post, http://www.ninjatrader.com/support/f...92&postcount=7, gives an explanation of at least one instance.

[alex.nt]

Mm-mm, good one but it looks like it is not the only case.

Moreover, StopLoss/ProfitTarget are not submitted directly from the code and yet they are passed to OnExecution as valid IOrder.

In any case it does not seem logical to pass orders to the function that "are not orders". I mean it probably has its own explanation but it is a strange-looking implementation...