Fetching Data from Indicator

[swcooke]

My Indicator fetches some data from a web resource every 5 minutes. I have created a simple timer that calls an Asynchronous task. My question is, I don't know where to dispose of the timer or write this so it automatically disposes. Here is my Code:

        //Run this every 5 minutes
        void TimerElapsed(object sender, ElapsedEventArgs e)
        {
            FetchDataAsync();
        }

        protected override void OnStateChange()
        {
            Print(State);
            if (State == State.SetDefaults)
            {
                Description                                    = @"Enter the description for your new custom Indicator here.";
                Name                                        = "TestProj";
                Calculate                                    = Calculate.OnPriceChange;
                IsOverlay                                    = false;
                DisplayInDataBox                            = true;
                DrawOnPricePanel                            = false;
                DrawHorizontalGridLines                        = true;
                DrawVerticalGridLines                        = true;
                PaintPriceMarkers                            = true;
                ScaleJustification                            = NinjaTrader.Gui.Chart.ScaleJustification.Right;
                IsSuspendedWhileInactive                    = false;
                AddPlot(new Stroke(Brushes.Black), PlotStyle.Bar, "Plot1");                
            }
            else if (State == State.Configure){
                FetchDataAsync();        //fetch the data the first time then timer takes over every 5mins
                System.Timers.Timer t = new System.Timers.Timer();
                t.Interval = 50000; // Every 5 mins
                t.AutoReset = true;
                t.Elapsed += new ElapsedEventHandler(TimerElapsed);
                t.Start();
            }            
        }

What event can I use to call t.Dispose() when the user removes the indicator. If I don't, the timer keeps running even though the Indicator is removed. Alternatively, is there another way to write this so that the timer is automatically disposed of at the right time?

[bltdavid]

Did you try inside OnStateChange?

else if (State == State.Terminated)
{
    if (myTimer != null)
        myTimer.Dispose();
}

[NinjaTrader_ChelseaB]

Hello swcooke,

bltdavid is giving a good suggestion.

Below is a link to an example of timer.
https://ninjatrader.com/support/forum/forum/ninjatrader-8/indicator-development/95391-nt8-sometimes-runs-onstatechange-termination-during-onbarupdate?p=777185#post777185

[swcooke]

Thanks. That is what I needed!