Object Reference Not Set

[MyFirstMillion]

Problem: Object Reference Error

Objective: Store 5Min OHLC prices and corresponding 60Min prices in a 2D array of 24 X8 (Past 24- 5 mins bars). Update these prices on bar update.Save the timestamps in another array of 24 X 1.

Code:

Initialization
--------------------------------------------------------------
else if (State == State.Configure)
{
AddDataSeries("EURUSD", Data.BarsPeriodType.Minute, 1, Data.MarketDataType.Last);
AddDataSeries("EURUSD", Data.BarsPeriodType.Minute, 5, Data.MarketDataType.Last);
AddDataSeries("EURUSD", Data.BarsPeriodType.Minute, 60, Data.MarketDataType.Last);
AddDataSeries("EURUSD", Data.BarsPeriodType.Minute, 240, Data.MarketDataType.Last);
AddDataSeries("EURUSD", Data.BarsPeriodType.Minute, 480, Data.MarketDataType.Last);
AddDataSeries("EURUSD", Data.BarsPeriodType.Minute, 720, Data.MarketDataType.Last);
AddDataSeries("EURUSD", Data.BarsPeriodType.Day, 1, Data.MarketDataType.Last);
AddDataSeries("EURUSD", Data.BarsPeriodType.Week, 1, Data.MarketDataType.Last);
SetProfitTarget("", CalculationMode.Price, 0);
SetStopLoss("", CalculationMode.Price, 0, false);

}
else if (State == State.DataLoaded)
{
i=0;
DateTime[] dt=new DateTime[BarsRequiredToTrade]; <-----------------------------initialize (I have tried to initialize on state.defaults too without success)
double[,] prices5=new double[BarsRequiredToTrade,4];
}

Use of code:
----------------------------------------------------------------------------------

protected override void OnBarUpdate()
{
if (BarsInProgress == 2)
{

if (CurrentBars[0] <1|| CurrentBars[1] <1 || CurrentBars[2] <2 || CurrentBars[3] <2 || CurrentBars[4] <2 || CurrentBars[5] <2 || CurrentBars[6] <1 || CurrentBars[7] <1|| CurrentBars[8] <1)
return;



if(i<BarsRequiredToTrade)
{

dt[i]=Times[2][0];<---------error
prices5[i,0]=Opens[2][0] ;
}

What am i doing wrong? Your help would be greatly appreciated.

THank You

[NinjaTrader_ChrisL]

Hi MyFirstMillion, thanks for your note.

Your data series are fine, so it must be coming from this:
dt[i]

Whats the index of 'i' when you get the error? Also consider using a List<T> object, this way you can call MyList.Add(object) and the array can expand dynamically:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1?view=netframework-4.8

I look forward to hearing of your results.

[MyFirstMillion]

Hi MyFirstMillion, thanks for your note.

Your data series are fine, so it must be coming from this:
dt[i]

Whats the index of 'i' when you get the error? Also consider using a List<T> object, this way you can call MyList.Add(object) and the array can expand dynamically:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1?view=netframework-4.8

I look forward to hearing of your results.

Both dt and i are null.

[NinjaTrader_Jim]

Hello MyFirstMillion,

You are creating a DateTime array "dt" within the scope of OnStateChange if (State == State.DataLoaded). As you are creating a new array within this scope, it would not be accessible from OnBarUpdate. I suspect that you are creating a DateTime array "dt" as a private variable for the class as well as for the scope of OnStateChange if (State == State.DataLoaded).

Please consider the following:

public class MyCustomStrategy6 : Strategy
{
    private DateTime[] dt;
    protected override void OnStateChange()
    {
        if (State == State.SetDefaults)
        {
            Description                                    = @"Enter the description for your new custom Strategy here.";
            Name                                        = "MyCustomStrategy6";
            IsInstantiatedOnEachOptimizationIteration    = true;
        }
        else if (State == State.Configure)
        {
            AddDataSeries("EURUSD", Data.BarsPeriodType.Minute, 1, Data.MarketDataType.Last);
            AddDataSeries("EURUSD", Data.BarsPeriodType.Minute, 5, Data.MarketDataType.Last);
        }
        else if (State == State.DataLoaded)
        {
            dt=new DateTime[3];
        }
    }

    protected override void OnBarUpdate()
    {
        if (BarsInProgress == 2)
        {
            dt[BarsInProgress] = Times[2][0];
        }
    }
}

We look forward to assisting.
.