topic Re: BackgroundWorker and Graphics in ArcGIS API for Silverlight Questions

BackgroundWorker and Graphics

LanceCrumbliss — Mon, 20 Aug 2012 02:21:26 GMT

Hello,

To keep the map and the progress bar responsive while generating a couple hundred point graphics in code-behind with a handful of calculated attributes, I'm trying to do it in a background worker thread using the backgroundworker class. However, even this single line

Dim g As New Graphic

as the first and only line in the RunWorkerAsync handler, a cross thread error is generated.

I use the backgroundworker class in other ESRI silverlight projects and it's really handy. However, this is the first time trying to generate graphics. Is this just not possible?

Lance

Re: BackgroundWorker and Graphics

DominiqueBroux — Mon, 20 Aug 2012 08:09:46 GMT

As a graphic contains an UI element, it needs to be created in the UI thread.

If you have lot of calculated attributes, you can do it in a background thread but you need to store the results in an intermediate structure. Then you need to come back to the UI thread to create the graphics.

Re: BackgroundWorker and Graphics

LanceCrumbliss — Mon, 20 Aug 2012 10:46:35 GMT

Thanks D. in hindsight that should have been obvious. and thanks for the idea.

Lance