Cross Thread Problem?

[boreland]

I'm using ChartTraderCustomButtonsExample coded by Chelsea Bell. I want to control one of the buttons from OnBarUpdate()


protected override void OnBarUpdate()
{
if (enTrade)
{
buttonsArray[0].Foreground = Brushes.Black;
if (!greenLight )
{
buttonsArray[0].Background = Brushes.Yellow;
}
else buttonsArray[0].Background = Brushes.LightGreen;

if (!greenLight) EnterLongStopMarket(aL2[0]);
else EnterShortStopMarket(aL[0] - TickSize);
}

}

When this method is called I get "Strategy 'ChartTraderCustomButtonsExample': Error on calling 'OnBarUpdate' method on bar 2406: The calling thread cannot access this object because a different thread owns it"

How should I code this correctly?

[NinjaTrader_Jim]

Hello boreland,

Thanks for your post.

You will want to use a dispatcher to modify UI elements from OnBarUpdate.

ChartControl.Dispatcher.InvokeAsync(() =>
{
    // Code to modify UI elements here
});

https://ninjatrader.com/support/helpGuides/nt8/?multi-threading.htm

We look forward to assisting.