onmarketdepth data cannot be referenced

[honvl]

Hello.

I have an indicator that grabs data OnMarketDepth and then performs calculations on that data OnBarUpdate and plots OnBarUpdate. It plots fine if the indicator is put on a chart. However, the indicator's plot values cannot be successfully referenced from another indicator or strategy. When I attempt to do so, it returns either 0 or the close price. I have tried public DataSeries, public doubles, and Plot0 to no avail. Does anyone know why?

Here is the code that I am using in another indicator to try to reference data from the first.

private IndicatorName ir = null;
        protected override void OnBarUpdate()
        {
			if(Historical)return;
			if(ir==null)ir=IndicatorName();
                        Plot0.Set(IndicatorName.Plot0[0]);
        }

and the indicator code itself is something like this

public class IndicatorName: Indicator
    {
        protected override void Initialize()
        {
			// Attach a market depth event handler
			if (Bars != null && Bars.MarketData != null)
			{
				marketDepth = Bars.MarketData.Connection.MarketDepthStreams[Bars.Instrument];
				if (marketDepth != null) 
					marketDepth.MarketDepthItem += new MarketDepthItemEventHandler(OnMarketDepth);
			}
	}
		 private void OnMarketDepth(object sender, MarketDepthEventArgs e)
		{
			b = e.MarketDepth.Bid.TotalVolume(5);
			a = e.MarketDepth.Ask.TotalVolume(5);
		}  
protected override void OnBarUpdate()
{
Plot0.Set(a+b);
}

public override void Dispose()
		{
			// Detach the event handler
			if (marketDepth != null)
				marketDepth.MarketDepthItem -= new MarketDepthItemEventHandler(OnMarketDepth);

			base.Dispose();
		}

[TAJTrades]

I think the Tech Support guys have mentioned many times not to process data in the Initialize() section. You may want to consider moving that code.

[NinjaTrader_Bertrand]

Hi honvl,

Thank you for posting your code - please review this reference sample from our forum - http://www.ninjatrader-support2.com/...ead.php?t=4991

[honvl]

I've discovered the issue. There was a

ChartControl.ChartPanel.Invalidate();

line in my indicator, a remnant from the original agOrderBookOscillator indicator that I developed my indicator from. I don't know what that line does, but it was eliminating the data. Once I removed it, data calls worked as usual. Thanks for your assistance, TAJTrades and Bertrand!

[NinjaTrader_Bertrand]

Great you got it resolved honvl!