When calling the Remove method of the Nodes collection of the diagram (d)

d.Nodes.Remove(node);

The call works correctly, the node is removed from the diagram however as soon as I move the mouse over the diagram, the Silverlight object crashes with an unhandled exception.

The specific node I was removing was created using the CreateShapeNode method of the diagram's Factory.

ShapeNode shape2 = d.Factory.CreateShapeNode(new Rect(20, 20, 50, 50), Shapes.Actor);


Stack Trace
----------------
   at MindFusion.Diagramming.Silverlight.DiagramNode.x3d2277a3b84b3698(DiagramNode x8d5eca828b99d00c)
   at MindFusion.Diagramming.Silverlight.Diagram.x92bb101faf551658(DiagramNode xda5bf54deb817e37)
   at MindFusion.Diagramming.Silverlight.Diagram.x2c5d1da1234c3a6a(Object xe0292b9ed559da7d, MouseEventArgs xfbf34718e704c6bc)
   at System.Windows.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)

This only happens when I try to handle the KeyDown event of the diagram and remove the node from within it. If I perform exactly the same action within say  button click event handler, all is well.

I think it must be an issue with the Silverlight plugin itself and an unsafe call into the nodes collection. ????

Looking forward to hearing your thoughts on how this might be handled.

Stoyo,

I tried everything to recreate the problem using version 1.0.2 without success. Works a treat!

The only other thing I just noticed with version 1.0.2 beta is that the background of the diagram using a LinearGradientBrush is not showing the colour. (The background of the drawing remains white) where this worked as expected with the previous version. I have inserted the xaml below.

<DiagramLite:Diagram x:Name="d"  LinkStyle="Bezier" Grid.ColumnSpan="1" Grid.RowSpan="1" Grid.Row="1" LayoutUpdated="d_LayoutUpdated" MinWidth="500" MinHeight="500" KeyDown="d_KeyDown">
           <DiagramLite:Diagram.Background>
           <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
           <GradientStop Color="#FF000000"/>
           <GradientStop Color="#FFC82D2D" Offset="1"/>
           </LinearGradientBrush>
           </DiagramLite:Diagram.Background>
           </DiagramLite:Diagram>

Thanks,

Eric

No worries. I changed it and it was fine.

In my opinion, you would be better to support both if at all possible as it makes your diagram control behave differently to all other Silverlight controls I have used.

So, you could expose the BackBrush property as you do now and reuse the property in the setting of the 'standard' Background dependency property.

Thanks for your help,

Eric