https://ninjatrader.com/support/helpGuides/nt8/?exposing_indicator_values_that.htm

//
// Copyright (C) 2015, NinjaTrader LLC <www.ninjatrader.com>.
// NinjaTrader reserves the right to modify or overwrite this NinjaScript component with each release.
//
#region Using declarations
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Xml.Serialization;
using NinjaTrader.Cbi;
using NinjaTrader.Gui;
using NinjaTrader.Gui.Chart;
using NinjaTrader.Gui.SuperDom;
using NinjaTrader.Data;
using NinjaTrader.NinjaScript;
using NinjaTrader.Core.FloatingPoint;
using NinjaTrader.NinjaScript.Indicators;
using NinjaTrader.NinjaScript.DrawingTools;
#endregion

//This namespace holds Strategies in this folder and is required. Do not change it.
namespace NinjaTrader.NinjaScript.Strategies
{
    public class SampleBoolSeriesStrategy : Strategy
    {
        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Description                 = @"Sample strategy demonstrating how to call an exposed BoolSeries object";
                Name                        = "SampleBoolSeriesStrategy";
                Calculate                   = Calculate.OnBarClose;
                EntriesPerDirection         = 1;
                EntryHandling               = EntryHandling.AllEntries;
                IsExitOnSessionCloseStrategy= true;
                ExitOnSessionCloseSeconds   = 30;
                IsFillLimitOnTouch          = false;
                MaximumBarsLookBack         = MaximumBarsLookBack.TwoHundredFiftySix;
                OrderFillResolution         = OrderFillResolution.Standard;
                Slippage                    = 0;
                StartBehavior               = StartBehavior.WaitUntilFlat;
                TimeInForce                 = TimeInForce.Gtc;
                TraceOrders                 = false;
                RealtimeErrorHandling       = RealtimeErrorHandling.StopCancelClose;
                StopTargetHandling          = StopTargetHandling.PerEntryExecution;
                BarsRequiredToTrade         = 20;
            }
            else if (State == State.Configure)
            {
                AddChartIndicator(MACD(12,26,9));
                AddChartIndicator(SampleBoolSeries());
            }
        }

        protected override void OnBarUpdate()
        {
            /* When our indicator gives us a bull signal we enter long. Notice that we are accessing the
            public BoolSeries we made in the indicator. */
            if (SampleBoolSeries().BullIndication[0])
                EnterLong();

            // When our indicator gives us a bear signal we enter short
            if (SampleBoolSeries().BearIndication[0])
                EnterShort();

            /* NOTE: This strategy is based on reversals thus there are no explicit exit orders. When you
            are long you will be closed and reversed into a short when the bear signal is received. The vice
            versa is true if you are short. */

            /* Print our exposed variable. Because we manually kept it up-to-date it will print values that
            match the bars object. */
            Print(SampleBoolSeries().ExposedVariable);
        }
    }
}