I often encounter the following exception when selecting or dragging DiagramItems (hard to reproduce exactly). It causes my application to crash. Version:2.1.1.23367

Exception:
System.InvalidOperationException:Failed to compare two elements in the array.

StackTrace:
at System.Array.SorterObjectArray.SwapIfGreaterWithItems(Int32 a, Int32 b)
   at System.Array.SorterObjectArray.QuickSort(Int32 left, Int32 right)
   at System.Array.Sort(Array keys, Array items, Int32 index, Int32 length, IComparer comparer)
   at System.Collections.ArrayList.Sort(Int32 index, Int32 count, IComparer comparer)
   at MindFusion.Diagramming.Wpf.x2965d493a804ca6b.x3ae2538770cbf5a5(Int32 x7f8a886f51b477eb)
   at MindFusion.Diagramming.Wpf.Diagram.x3ae2538770cbf5a5(Int32 x7f8a886f51b477eb)
   at MindFusion.Diagramming.Wpf.Diagram.x3ae2538770cbf5a5()
   at MindFusion.Diagramming.Wpf.Diagram.ArrangeOverride(Size finalSize)
   at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
   at System.Windows.UIElement.Arrange(Rect finalRect)
   at System.Windows.ContextLayoutManager.UpdateLayout()
   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)

InnerException:
[System.NullReferenceException] = {"Object reference not set to an instance of an object."}

StackTrace:
   at MindFusion.Diagramming.Wpf.Diagram.GetDiagramItem(UIElement item)
   at MindFusion.Diagramming.Wpf.xddab178229d7219f.x7aeaf17dbdd7799a(Object x08db3aeabb253cb1, Object x1e218ceaee1bb583)
   at MindFusion.Diagramming.Wpf.xddab178229d7219f.xd2b26c831a48c764(DiagramItem xde860fba55c41d76, DiagramNode xb6a159a84cb992d6)
   at MindFusion.Diagramming.Wpf.xddab178229d7219f.x7aeaf17dbdd7799a(Object x08db3aeabb253cb1, Object x1e218ceaee1bb583)
   at MindFusion.Diagramming.Wpf.xddab178229d7219f.Compare(Object x, Object y)
   at System.Array.SorterObjectArray.SwapIfGreaterWithItems(Int32 a, Int32 b)

Have you by chance added any object not derived from DiagramItem as a child of Diagram or Diagram.DocumentPlane?

Hi we've just got the message too. We've yet to replicate outside of our application, but thought we'd share the following exception details:

at MindFusion.Diagramming.Wpf.Diagram.GetDiagramItem(UIElement item)
at MindFusion.Diagramming.Wpf.xddab178229d7219f.x7aeaf17dbdd7799a(Object x08db3aeabb253cb1, Object x1e218ceaee1bb583)
at MindFusion.Diagramming.Wpf.xddab178229d7219f.xd2b26c831a48c764(DiagramItem xde860fba55c41d76, DiagramNode xb6a159a84cb992d6)
at MindFusion.Diagramming.Wpf.xddab178229d7219f.x7aeaf17dbdd7799a(Object x08db3aeabb253cb1, Object x1e218ceaee1bb583)
at MindFusion.Diagramming.Wpf.xddab178229d7219f.Compare(Object x, Object y)
at System.Array.SorterObjectArray.SwapIfGreaterWithItems(Int32 a, Int32 b)

Which was an inner exception of :
at System.Array.SorterObjectArray.SwapIfGreaterWithItems(Int32 a, Int32 b)
at System.Array.SorterObjectArray.QuickSort(Int32 left, Int32 right)
at System.Array.Sort(Array keys, Array items, Int32 index, Int32 length, IComparer comparer)
at System.Collections.ArrayList.Sort(Int32 index, Int32 count, IComparer comparer)
at MindFusion.Diagramming.Wpf.x2965d493a804ca6b.x3ae2538770cbf5a5(Int32 x7f8a886f51b477eb)
at MindFusion.Diagramming.Wpf.Diagram.x3ae2538770cbf5a5(Int32 x7f8a886f51b477eb)
at MindFusion.Diagramming.Wpf.Diagram.x3ae2538770cbf5a5()
at MindFusion.Diagramming.Wpf.Diagram.ArrangeOverride(Size finalSize)
at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)

the rest of the exception is trunctaed due to forum restrictions.

Did the version sent to the original poster fix the issue?

Thanks

Paul Eden

Hi Paul,

Try the version from the PM page.

Stoyan

It should be stable, it's close to the build we are releasing now with v2.2.

Stoyan