Programmatically access and change the properties for a Strategy while it is running

[ntram]

Hello:

I have a custom strategy with a few Properties (Inputs). I have also developed an AddOn in C# and it works well. Will i be able to access the instance of my custom strategy that is running from the AddOn code, say for example a button click and change the values of the Properties.

I see there is a StrategyBase object and it has properties like Variable0, Variable1, ... But it is not clear to me on how to use this StrategyBase object to manipulate the particular instance of my custom strategy that is currently running.


Thanks
Ram

[NinjaTrader_ChelseaB]

Hello Ram,

You have posted in the NinjaTrader 7 section of the forums, is this script for NinjaTrader 7?

Unfortunately, there is not documented or supported code to access running NinjaScripts from an addon. With NinjaTrader 8, there is a unsupported code sample of finding active indicators that might work for strategies. Let me know if you have interest in NinjaTrader 8.

[ntram]

Hello Chelsea,

Thank you for your response. I didnt realize I posted my message in NinjaTrader 7 section. I am actually using NinjaTrader version 8.1.1.7. Please give me more details about what you were referring to as the undocumented approach. I am very interested.

Thanks

[NinjaTrader_ChelseaB]

Hello Ram,

Below are links to the unsupported code samples.

https://forum.ninjatrader.com/forum/historical-beta-archive/version-8-beta/78942-convert-reference?p=687943#post687943

https://forum.ninjatrader.com/forum/historical-beta-archive/version-8-beta/83700-one-indicator-change-the-properties-of-another-indicator?p=717883#post717883

[ntram]

Hello Chelsea,

Thank you very much for pointing me in the right direction - this approach worked for strategies too - It is a shame this is an undocumented approach and could all stop working someday. I would have spent endless hours without realizing that the ChartControl has all the strategy references. It is quite well documented in the help docs, but it is in a very unstructured manner that makes it almost impossible to find. Thank you again.

If anyone else is interested here is a snippet of code that you can use to get a reference to the running strategy and then manipulate its properties. The key is to declare your reference as dynamic. This will allow you to set properties and call methods on your strategy object while still being able to compile in Visual Studio.

private dynamic myStrat = null;
private string strategyName = "MyTestStrategy";

private async void GetStrategyReference()
{
    foreach (Window window in Globals.AllWindows)
    {
        NTWindow w = (NTWindow)window;
        await window.Dispatcher.InvokeAsync(new Action(() =>
        {
            if (w.Caption.Contains("Chart"))
            {
                foreach (ChartControl cc in FindVisualChildren<ChartControl>(w))
                {
                    myStrat = cc.Strategies.Where(x => x.Name == strategyName).FirstOrDefault();
                    if (myStrat != null)
                    {
                        break;
                    }
                }
            }
        }));
    }

    myStrat.Print("Found Strategy - StrategyId: " + myStrat.Id.ToString());
}


private void TestStrategyAccess()
{
    //now you can access the properties and methods of your custom strategy
    myStrat.TrailingTicks = 30;
}​​