For what kind of item type did that happen and what's its HandlesStyle value?

I use the control to put together a tree like sequence diagram.
I generate ShapeNodes as well as the DiagramLinks between them.

I handle the Diagram_DrawNode event to custom draw all of the shape nodes (ShapeCustomDraw = MindFusion.Diagramming.CustomDraw.Additional)
There is a try catch block around all code in this event handler so we know the error is not being fired from within there.

None of the properties of the diagram have changed in over a year, yet this bug has only started occurring since our latest rollout.

All the handles styles are out of the box. RotationHandleBrush appears to be null.
I paused the code after loading the tree and checked the handle style values

? diagram1.SelectedItemHandlesStyle
{MindFusion.Diagramming.HandlesVisualStyle}
ControlPointBrush: {Solid}
DashPen: {Solid}
HandleBrush: {Solid}
HandlePen: {Solid}
HatchBrush: {Hatch}
PatternBrush: {Hatch}
RotationHandleBrush: null
c1b13e19ba06bfb790bda0ebad3a57687: null
c4c055bcc8ae241269d46451312553450: {Solid}
c4c66f5b3ad71855cdd4d04c45803cf65: {Solid}
c5cf7e840ea88ef3cc1d0f37b76ca3af9: {Solid}
c60dbcc7afaa46b1fde9056e70f0e9b26: {Hatch}
c62b7576c5532c101dda98e43fac94b09: {Solid}
c78742fd36e694a84a8512a6bc84cbab3: {Solid}
c9295fb333ca2c734bf03e5fdb03dedbc: {Hatch}
cb90a04ed593b1698d608b42851271cb2: {Solid}

? diagram1.ActiveItemHandlesStyle
{MindFusion.Diagramming.HandlesVisualStyle}
ControlPointBrush: {Solid}
DashPen: {Solid}
HandleBrush: {Solid}
HandlePen: {Solid}
HatchBrush: {Hatch}
PatternBrush: {Hatch}
RotationHandleBrush: null
c1b13e19ba06bfb790bda0ebad3a57687: null
c4c055bcc8ae241269d46451312553450: {Solid}
c4c66f5b3ad71855cdd4d04c45803cf65: {Solid}
c5cf7e840ea88ef3cc1d0f37b76ca3af9: {Solid}
c60dbcc7afaa46b1fde9056e70f0e9b26: {Hatch}
c62b7576c5532c101dda98e43fac94b09: {Solid}
c78742fd36e694a84a8512a6bc84cbab3: {Solid}
c9295fb333ca2c734bf03e5fdb03dedbc: {Hatch}
cb90a04ed593b1698d608b42851271cb2: {Solid}


Here are the properties of the diagram

diagramView1.Behavior = Behavior.DrawLinks;
diagramView1.ModificationStart = ModificationStart.AutoHandles;
diagramView1.ShowToolTips = true;

diagram1.NodesExpandable = true;
diagram1.AllowUnconnectedLinks = false;
diagram1.LinkHeadShape = ArrowHeads.BowArrow;
diagram1.LinkShape = LinkShape.Polyline;
diagram1.ShadowsStyle = ShadowsStyle.None;
diagram1.ShapeHandlesStyle = HandlesStyle.Invisible;
diagram1.LinkHandlesStyle = HandlesStyle.EasyMove;




Thank you.

Sorry, I've missed your post. Please post full stack trace showing the type of objects called, e.g. it looks like this in my test -

>	ApiTester.exe!ApiTester.MainForm.diagram_DrawNode(object sender = {MindFusion.Diagramming.Diagram}, MindFusion.Diagramming.DrawNodeEventArgs e = {MindFusion.Diagramming.DrawNodeEventArgs}) Line 5178	C#
 	MindFusion.Diagramming.dll!MindFusion.Diagramming.DiagramBase.OnDrawNode(MindFusion.Diagramming.DrawNodeEventArgs e = {MindFusion.Diagramming.DrawNodeEventArgs}) + 0x99 bytes
 	MindFusion.Diagramming.dll!MindFusion.Diagramming.DiagramBase.c2170f1240e144e3a321b7ac95a61cffc(MindFusion.Diagramming.DrawNodeEventArgs ccccb5c615104a5178972fa16c8a01650 = {MindFusion.Diagramming.DrawNodeEventArgs}) + 0xc4 bytes
 	MindFusion.Diagramming.dll!MindFusion.Diagramming.Diagram.c2170f1240e144e3a321b7ac95a61cffc(MindFusion.Drawing.IGraphics c6c92d7b0a001e45905428290158c2b17 = {MindFusion.Drawing.GdiGraphics}, MindFusion.Diagramming.DiagramNode cf97bac6b0d408303acc822ab78fc1a19 = {MindFusion.Diagramming.ShapeNode}, bool c9ad6e71c98bc3301de210ef60cbebaf6 = true, System.Drawing.RectangleF c890ffd49e808b04095f06b4eb842e073 = {X = 1.0 Y = 1.0 Width = 42.33333 Height = 38.629158}) + 0x99 bytes
 	... 

We don't see how catching and ignoring null-reference exceptions instead of fixing underlying logic error is a good idea. If you really want that, you can override DiagramView.OnPaint and call base method within a try / catch.

Regards,
Slavcho

Quote:


Could you share what else changed in latest rollout? Like moving to a new .NET version, moving to a new diagramming.dll version, adding new components to the application?