"Collection was modified; enumeration operation may not execute." - Diagramming Components

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"Collection was modified; enumeration operation may not execute." (Read 2532 times)

j poz Junior Member Offline I Love MindFusion! Posts: 78 Joined: Nov 21^st, 2012	"Collection was modified; enumeration operation may not execute." Mar 18^th, 2014 at 3:21pm	Print Post
	We are running into an issue whereby DiagramView.OnMouseMove is throwing an InvalidOperationException.. Not exactly sure what's happening, but here is the stack trace: --------------------------------------------------------------- at System.Collections.Generic.List`1.Enumerator.MoveNextRare() at MindFusion.Diagramming.Selection.VisitHierarchy(ItemVisitor visitor) at MindFusion.Diagramming.Diagram.DrawInteraction(IGraphics graphics, RenderOptions options, RectangleF clipRect) at MindFusion.Diagramming.WinForms.Behaviors.BehaviorBase.OnMouseMove(Point mousePosition) at MindFusion.Diagramming.WinForms.DiagramView.OnMouseMove(MouseEventArgs e) at System.Windows.Forms.Control.WmMouseMove(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: "Collection was modified; enumeration operation may not execute." Reply #1 - Mar 18^th, 2014 at 4:47pm	Print Post
	This might happen if you change selection state of items from a custom-draw event or custom items' Draw override? That would modify the Selection object's collections while Selection.VisitHierarchy runs with a PainterVisitor, and throw on next iteration.


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