Hi Stoyo,

In certain circumstances, I am calling

chart.DestroyGroup(group); 

and getting a 'not in Collection' exception, despite the fact that it is in the chart.Groups collection (as shown by the contains() method, I have even nested the DestroyGroup comand in a 'if contains' clause, which passes, then the DestroyGroup fails)

In my 'immedeate' window in debug I can call the

chart.DestroyGroup(group); 

succesfully, however in the code it fails.

The actual exception is

Cannot remove the specified item because it was not found in the specified Collection. 

Stack

   at System.Collections.CollectionBase.System.Collections.IList.Remove(Object value)
   at MindFusion.Diagramming.WinForms.ArrowCollection.Remove(Arrow arrow)
   at MindFusion.Diagramming.WinForms.FlowChart.xcb9d24c05271f0d0(ChartObject xccb63ca5f63dc470)
   at MindFusion.Diagramming.WinForms.FlowChart.x2237804176f4caea(ChartObject xccb63ca5f63dc470)
   at MindFusion.Diagramming.WinForms.Commands.RemoveItemCmd.Execute(Boolean undoEnabled)
   at MindFusion.Diagramming.WinForms.UndoManager.xdf8cd2685f83d9b7(Command x61b060a94340c4fc)
   at MindFusion.Diagramming.WinForms.Commands.RemoveItemCmd.Execute()
   at MindFusion.Diagramming.WinForms.FlowChart.x7d877b7264517b49(ChartObject xccb63ca5f63dc470)
   at MindFusion.Diagramming.WinForms.Node.x1e79a23123e06c84()
   at MindFusion.Diagramming.WinForms.FlowChart.x2237804176f4caea(ChartObject xccb63ca5f63dc470)
   at MindFusion.Diagramming.WinForms.Commands.RemoveItemCmd.Execute(Boolean undoEnabled)
   at MindFusion.Diagramming.WinForms.UndoManager.xdf8cd2685f83d9b7(Command x61b060a94340c4fc)
   at MindFusion.Diagramming.WinForms.Commands.RemoveItemCmd.Execute()
   at MindFusion.Diagramming.WinForms.FlowChart.x7d877b7264517b49(ChartObject xccb63ca5f63dc470)
   at MindFusion.Diagramming.WinForms.Group.x1728a8b42c4b1ae1(Boolean xcf407f8ccb2b3916)
   at MindFusion.Diagramming.WinForms.Commands.RemoveGroupCmd.Execute(Boolean undoEnabled)
   at MindFusion.Diagramming.WinForms.UndoManager.xdf8cd2685f83d9b7(Command x61b060a94340c4fc)
   at MindFusion.Diagramming.WinForms.Commands.RemoveGroupCmd.Execute()
   at MindFusion.Diagramming.WinForms.FlowChart.DestroyGroup(Group group)
   at Pelion.PM3.SolutionBuilder.Builders.Groups.SolutionGroups.DestroyGroup(GroupType groupType, Hashtable ImageBoxes) in C:\PEPS\R_01_5_5\PM3 

Very strange, very frustrating.

Any ideas?

Hi,

Is the AutoDeleteItems property of that group enabled? In such case you could just delete the group's main node - that should automatically destroy the group and delete the child items.

Stoyan

Are the cached arrows deleted by some event handler, e.g. NodeDeleted or GroupDestroyed? The control might not detect that and try to delete them for a second time, which would throw that exception. In such case, you could add a check whether an arrow is linked to a box from the group, and if so - do not delete it.

I hope that helps,
Stoyan