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Creating ArcGIS Pro addin - Cannot evaluate expression because the current thread is in a stack overflow state.

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08-19-2023 04:31 PM
ChrisCrowe1
New Contributor II

I am running Visual Studio 2022 - Version 17.7.1

I am running ARC GIS pro 3.1.0

I created a simple c# addin from the ArcGIS Pro Module Addin from a template in Visual Studio.

I added a button and in the onclick event I have this code

protected override void OnClick()
       {
               //Get the active map view.
               var mapView = MapView.Active;
               if (mapView == null)
                   return;
       }

 This code works and I can see properties of the mapView if I set a breakpoint.

ChrisCrowe1_0-1692487465405.png

However I can't call the method below since it needs to be run on the main thread.

var selectedFeatures = mapView.Map.GetSelection();

Changing my code to the following and using QueuedTask.Run allows this to work and it does indeed flash the selected object.

protected override void OnClick()
       {
           QueuedTask.Run(() =>
           {
               //Get the active map view.
               var mapView = MapView.Active;
               if (mapView == null)
                   return;
 
               var selectedFeatures = mapView.Map.GetSelection();
 
               //Flash the collection of features.
               mapView.FlashFeature(selectedFeatures);
           });
       }

 But if I put a breakpoint within the QueuedTask.Run body I get a stack overflow error when trying to view most object properties 

ChrisCrowe1_1-1692487719240.png

 

So the code works but I cant see any properties while debugging. I have no idea what is causing this and hence I can't actually write my plugin.

Cannot evaluate expression because the current thread is in a stack overflow state.

Hopefully someone has an idea?

 

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