Chart Instrument Changed Event

[TheTradingMantis]

I have an Addon that subscribes to OnMarketData. When a new chart is created, a subscription is added if the chart primary instrument is not currently on another chart. Likewise, when a chart is destroyed, the subscription is removed if no other charts use that instrument.

Using the chart instrument selector and the the StringValueChanged event, I am also able to capture when a chart instrument is changed and subscribe to OnMarketData if necessary.

My problem is identifying the old instrument when a chart instrument is changed. Without the old instrument, I am not able to unsubscribe from OnMarketData.

Do you have any suggestions? My fallback is to keep an internal list of all chart instruments and then query the list when a change occurs.

Thanks, Greg

[NinjaTrader_ChrisL]

Hi gregschr, thanks for posting.

It depends on how your addon is implemented. The Sample Addon Framework example shows how to handle this. See the public Cbi.Instrument Instrument property where they check if its null, if null the OnMarketData is unsubscribed, the download can be found here:

https://ninjatrader.com/support/help...t_overview.htm

Kind regards,
-ChrisL