Can I use the UserData property of class Order?

[NinjaTrader_ChelseaB]

Hello CDXTrader,

If you are wanting to write information and read information from a file, you will need custom code that writes those files.

You can write to text file with StreamWriter and read from a text file with StreamReader.
https://ninjatrader.com/support/help...o_write_to.htm
https://ninjatrader.com/support/help...o_read_fro.htm

NinjaTrader does not support access to the NinjaTrader database.

[CDXTrader]

Hi Chelsea, thank you for the reply.
Yes, saving an Order object and some custom information along with it is quite a simple endeavor but that does not help me persist that information to disk so the orders are automatically reloaded upon restart. I thought maybe a custom Order property was available that would do the trick. Seems like overkill to create my own file database and read/write/maintain it only for one tiny string. Oh well, appreciate the thought.

[NinjaTrader_ChelseaB]

Hello CDXTrader,

There is not a recommend approach to saving other information with an order, but first thoughts that come to mind is a custom class that has an Order object along with the custom field.

public class MyCustomOrderClass()
{
public Order ThisOrder;
public string MyCustomInfoString;
}

new MyCustomOrderClass() { Order = order, MyCustomInfoString = "information I want to save with the order" };

[CDXTrader]

Understood, thank you anyway Stefan.

NinjaTrader_ChelseaB
Since this thread was posted do you guys have any other field or suggestion on how to store and persist my own custom order data to an Order object? One simple string field would do.

I've tried creating my own class inheriting from the Order class but NT does not recognize it. I've also tried FromEntrySignal but this field does not seem to persist to disk/database automatically. Perhaps there's some static method I can use to persist this field to the database after setting the field?

As always, any help would be greatly appreciated. Or if you can just point me in the right direction of which class or property to look at, that would be awesome.
cheers

[gurko]

Unfortunately, I don't remember. The OrderId field is neither unique nor constant (according to the docs), so it can't be used to safely reference an order. No idea, sorry!

[CDXTrader]

Hi Stefan,
I realize this comment is years old but I was wondering did you ever find a suitable way to store custom data for your orders?
cheers

[gurko]

Thank you Chelsea,

fine, I will leave the undocumented fields alone. I can store my order-related data in other ways.

Kind regards,
Stefan.

[NinjaTrader_ChelseaB]

Hello Stefan,

Our development has given me a response.

The Order.UserData collection is not indented for use with NinjaScripts and is used for internal tracking from the core of NinjaTrader.

Modifying this collection can result in unintended behavior.

Further, the OnBehalfOf property is also used internally, is not intended for use with NinjaScripts and they are not providing information on how this is used internally.

[NinjaTrader_ChelseaB]

Hello Stefan,

I've inquiried with our development about these properties.

Once I have more information I will update this thread.

We appreciate your patience.

[gurko]

Hi,

two questions, please:

I see an undocumented property named UserData in the Order class. The name seems to suggest I could use it to attach arbitrary data to an order. Is that so?

Also, there is an OnBehalfOf property (also undocumented). What is the purpose of this property?

Kind regards,
Stefan.