Chart rendering failed... OnRender method. D2D error

[TheTradingMantis]

I have been getting the following error off and on for over a year:

Chart rendering failed. There is likely a problem with a chart object's OnRender method. D2D error = 'An item with the same key has already been added.'

I have also seen many other forum posts where others have gotten the same error but did not see any resolution.

Well, I have FINALLY been able to reproduce the error consistently using just one standard drawing tool object and one standard indicator.

To reproduce the error, do the following:

1) Copy the attached workspace file to the Workspace folder. It just has 2 chart windows, one with a single data series and one with 3 data series (All ES).

2) Startup NinjaTrader with a clean workspace, only the Control Center, no other charts or windows open. Also make sure no other workspaces are open. Open the Chart Freeze workspace.

3) Next draw an object using any standard drawing tool on the chart with a single data series. Open the properties of the object you drew and attach it to all charts if it is not already set that way.

4) Next Add the TrendLine indicator that comes with NinjaTrader to the chart with 3 data series. The chart with 3 data series should freeze.

I am guessing any indicator that uses one of the draw methods will produce the same results.

Thanks, Greg

[NinjaTrader_Jason]

Hello Greg,

I'm able to reproduce the issue on my end. I will create a bug report for Development. Thank you for reporting and for providing these steps.

[LeonK]

Hello Greg,

I'm able to reproduce the issue on my end. I will create a bug report for Development. Thank you for reporting and for providing these steps.

Any resolution / follow up on this issue? I am seeing it with the latest NT8 release.

[NinjaTrader_Jason]

Hello LeonK,

Unfortunately not, Development is still looking into it.

[frslvr]

Hi Jason,
Please count my vote to fix it. Global objects are a mess.
Thanks

[Bidder]

TheTradingMantis. Thanks for this information. I have wasted countless hours debugging my own code thinking that it was the source of the problem. Thank you for this.
Some comments in the post below indicate this bug was introduced in v26

https://forum.ninjatrader.com/forum/ninjatrader-8/platform-technical-support-aa/1202658-drawing-objects-freezing-my-chart

[Bidder]

To NT: This definitely needs to be fixed. There are a variety of scenarios in which I encounter this error.

[Bidder]

What is the software id on this fix ?

[NinjaTrader_Jason]

We provide tracking numbers for feature requests, not for bug reports.

[Bidder]

Has this been fixed in the 8.1.x ??

[QuantKey_Bruce]

Has this been fixed in the 8.1.x ??

No, it is still just as broken in 8.1.1.6.

[QuantKey_Bruce]

I think it is worth noting that this is not a bug in the inbuilt Trend lines indicator - this appears to be a bug in drawing object handling. The reason we can say that with some confidence is that the Trend lines indicator has an empty OnRender that looks like this:

protected override void OnRender(ChartControl chartControl, ChartScale chartScale) { /* Don't Render Plots */ }
​

Because the error given is a DirectX error, and because @Trendlines.cs does not use DirectX at all, it seems reasonable to conclude that the problem is not in @Trendlines.cs.

[QuantKey_Bruce]

Also, the problem is not that the override of OnRender is empty. If you make a copy of @Trendlines.cs and remove the OnRender override compeletely to even further isolate that it is not @Trendlines.cs at fault, it still has the same failure.

[QuantKey_Bruce]

NinjaTrader_ChelseaB Could you help make sure this bug gets to the right person so it can be addressed please? There is a completely solid reproduce scenario that crashes charting on 8.1.1.6.

[QuantKey_Bruce]

See also: https://forum.ninjatrader.com/forum/...or#post1252166

And, you can make this same message happen using drawing tools attached to all charts and with the Duplicate Window function. There is a bug in this area.