Indicator instanciation in class other than strategy or indicator

[MojoJojo]

Hi,

I'd like to instantiate an indicator in a class usable by both a strategy and and other indicators.
One solution I have found is functional but ugly:

class HelperCode {
    private SMA sma
    public HelperCode(NinjaScriptBase ns) {
        if(ns is Indicator) {
            sma = ((Indicator)ns).SMA(10);
        } else if(ns is Strategy) {
            sma = ((Strategy)ns).SMA(10);
        }
    }
}

Unfortunately I've not been able to identify a proper class/interface to cast to or create an instance with new.
Any help would be appreciated.

[NinjaTrader_ChelseaB]

Hello MojoJojo,

This kind of programming would be outside of what is supported by NinjaTrader Support.
This thread will remain open for any community members that would like to provide undocumented/unsupported suggestions.

As a heads up, Indicators are read by NinjaTrader which requires a specific format as this generates other code wrappers behind the scenes.
Attempting to extend classes will cause issues.

Below is a link to an example of shared classes that uses unsupported code you may find helpful.

https://ninjatrader.com/support/forum/forum/historical-beta-archive/version-8-beta/83018-partial-class-does-not-work?p=712245#post712245

[MojoJojo]

Hello Chelsea,

thanks for your reply. I can understand that NT has no simple way for instantiating indicators outside of a strategy and indicator classes.

Judging by the auto generated code, there is no common interface or class.
Maybe something could be done via reflection but this would hardly be an improvement.

Example:

namespace NinjaTrader.NinjaScript.Strategies
{
    public partial class Strategy : NinjaTrader.Gui.NinjaScript.StrategyRenderBase
    {
        public Indicators.ADX ADX(int period)
        {
            return indicator.ADX(Input, period);
        }

        public Indicators.ADX ADX(ISeries<double> input , int period)
        {
            return indicator.ADX(input, period);
        }
    }
}

[MojoJojo]

Just because I enjoy a good puzzle, here is a possible solution which avoids code duplication.
Instead it breaks code encapsulation which can hardly be encouraged.

class HelperCode {
    private SMA sma
    public HelperCode(NinjaScriptBase ns) {
        Indicator indicator = null
        if(ns is Indicator) {
            indicator = (Indicator)ns;
        } else if(ns is Strategy) {
            indicator  = GetInstanceField<Indicator>(
                  ns
                , "indicator"
                , typeof(Strategy)
            );
        }
        sma = indicator.SMA(10);
    }

    internal static T GetInstanceField<T>(object instance, string fieldName, Type type) {
        BindingFlags bindFlags =
              BindingFlags.Instance
            | BindingFlags.Public
            | BindingFlags.NonPublic
            | BindingFlags.Static;
        FieldInfo field = type.GetField(fieldName, bindFlags);

        return (T)field.GetValue(instance);
    }

}