Error - calling thread cannot access this object because a different thread owns it

[trendisyourfriend]

I created a strategy in Ninjascript and got this error:

====

Strategy 'myStrat01': Error on calling 'OnBarUpdate' method on bar 53216:

The calling thread cannot access this object because a different thread owns it.

====

I can't find a way to resolve it and tried different things but to no avail.

Here is what i do...

My strategy displays a series of buttons created during the initialization phase (State.DataLoaded phase).

The error occurs when i try to change the background attribute of some of the buttons during the OnBarUpdate()

Ex.

protected override void OnBarUpdate()

...

#region DoSomeCleanUp_WhenTradeIsOver

//-

if ( IsTradeInProgress && (atmStrategyId.Length + orderId.Length) == 0 )

{

IsTradeInProgress = false;

isAtmStrategyCreated = false;

buttonSell.Background = Brushes.DarkSlateGray; // <- this line raises an error

sellModeEnabled = false;

buttonBuy.Background = Brushes.DarkSlateGray; // <- this line raises an error

buyModeEnabled = false;

}

}

//-

#endregion

If i remove the faulty lines in Bold then everything works perfectly.

Do you have something to suggest to change the background color during the OnBarUpdate. I tried to Freeze the colors but it did not help.

Thanks

[NinjaTrader_ChrisL]

Hi, thanks for posting.

Use ChartControl.Dispatcher.InvokeAsync when accessing the button because the NinjaScript object runs on a non-UI thread:

https://ninjatrader.com/support/foru...39#post1180339 - Example

Kind regards,
-ChrisL

[trendisyourfriend]

Thank you very much, it worked as expected.