The diagram I was laying out was previously in an AnnealLayout with Striaght / Dynamic Links with no joints in them.

System.ArgumentOutOfRangeException was unhandled
  Message="Index was out of range. Must be non-negative and less than the size of the collection.\r\nParameter name: index"
  Source="mscorlib"
  ParamName="index"
  StackTrace:
       at System.Collections.CollectionBase.System.Collections.IList.get_Item(Int32 index)
       at MindFusion.Diagramming.PointCollection.get_Item(Int32 index)
       at MindFusion.Diagramming.DiagramLink.x5fcd47acc4164137()
       at MindFusion.Diagramming.DiagramLink.xd433eaf1292c9575()
       at MindFusion.Diagramming.DiagramLink.x0d5905a18dc24aa7(Boolean x1c5ff8c3c1ac16ad)
       at MindFusion.Diagramming.DiagramLink.UpdateFromPoints(Boolean updateGroups, Boolean updateSegmentCount)
       at MindFusion.Diagramming.DiagramLink.UpdateFromPoints(Boolean updateGroups)
       at MindFusion.Diagramming.DiagramLink.UpdateFromPoints()
       at MindFusion.Diagramming.Layout.x3462aa19b03aac15.xe47b2712dbae7a09()
       at MindFusion.Diagramming.Layout.x3462aa19b03aac15.x0360c0152e0fc04b(ArrayList x6fa2570084b2ad39)
       at MindFusion.Layout.x0bd7aa907b5c2ae1.xa80296b5ce0aad9d(x82e1bd820ac7ff15 x9fc3ee03a439f6f0, ArrayList xd9cc9787b074c77c)
       at MindFusion.Layout.x0bd7aa907b5c2ae1.x96f3a1e179e5157d(x82e1bd820ac7ff15 x9fc3ee03a439f6f0, Single xd4d7bd59bc0483e3)
       at MindFusion.Layout.xabd66bcda3e8fc57.x8d75079465097c70(x0bd7aa907b5c2ae1 x6b631e0009a9deea, Boolean x4c8d8e849653d454, x01a1fee0f328037a xf4336cad79ab23b5)
       at MindFusion.Layout.xabd66bcda3e8fc57.x0bd7aa907b5c2ae1(Boolean x4c8d8e849653d454)
       at MindFusion.Diagramming.Layout.FlowLayout.BendLinks(Diagram diagram)
       at MindFusion.Diagramming.Layout.FlowLayout.x91cb73cecf8b5941(Diagram x8b62359f01cfd806)
       at MindFusion.Diagramming.Layout.FlowLayout.Arrange(Diagram diagram, DiagramItemCollection items, RectangleF[] laneBorders)
       at MindFusion.Diagramming.Layout.FlowLayout.Arrange(Diagram diagram, DiagramItemCollection items)
       at MindFusion.Diagramming.Layout.Layout.Arrange(Diagram diagram)
       at FlowVisualiser.FlowVisualiser.LayoutAllItems() in C:\Perforce\f1branches\dev\dev1\programming\tools\fe\FlowVisualiser\FlowVisualiser.cs:line 1213
       at FlowVisualiser.FlowVisualiser.LayoutFlowDiagram() in C:\Perforce\f1branches\dev\dev1\programming\tools\fe\FlowVisualiser\FlowVisualiser.cs:line 1240
       at FlowVisualiser.FlowVisualiser.applyToolStripMenuItem1_Click(Object sender, EventArgs e) in C:\Perforce\f1branches\dev\dev1\programming\tools\fe\FlowVisualiser\FlowVisualiser.cs:line 1533
       at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
       at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
       at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
       at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
       at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
       at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
       at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
       at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
       at System.Windows.Forms.ToolStrip.WndProc(Message& m)
       at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at FlowVisualiser.Program.Main() in C:\Perforce\f1branches\dev\dev1\programming\tools\fe\FlowVisualiser\Program.cs:line 17
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
 

Thank you, our developer will check this tomorrow.

I managed to narrow this crash down to these lines of code:

            public void Setup(Diagram diagram)
            {
                FlowLayoutRules rules = this.LayoutRules;

                rules.PreferredRules = PreferredRules.ConnectorRules;
                rules.ConnectorRules.HorizontalBendOrientation = false;
            }
 

as a work around just remove from the code

rules.ConnectorRules.HorizontalBendOrientation = false;
 

also... should we run anneal layout before that to reproduce the exception?

okay I've emailed the diagram

We still can't reproduce it :-/ After replacing the IDs of your custom classes to load the file, FlowChartShapeNode with std:ShapeNode, FlowChartLink with std:DiagramLink, etc, FlowLayout runs without an exception. Do your custom item classes override any methods of the base classes? Any chance you send us the code for the custom classes?

Also, seems with that setup the layout cannot find any rules to follow, and just bends the links while preserving the node positions, which should not be different from applying OrthogonalRouter.

Stoyan

public class FlowNodeShapeNode : MindFusion.Diagramming.ShapeNode
	  {
		#region Internal State
		private Node m_flowNode;
		private XmlNode m_stateNode = null;
		private eNodeType m_nodeType = eNodeType.standardNode;
		#endregion

		#region Constructors
		static FlowNodeShapeNode()
		{
		}
		public FlowNodeShapeNode(Diagram diagram, Node flowNode, eNodeType nodeType, XmlDocument statesXml) : base(diagram)
		{
		    PointF position = new PointF(m_random.Next(0, 400), m_random.Next(0, 400));
		    SizeF size = new SizeF(40, 10);
		    diagram.Nodes.Add(this);
		    this.Move(position.X, position.Y);
		    this.Resize(size.Width, size.Height);
		    this.TextFormat.Alignment = StringAlignment.Center;
		    this.NodeType = nodeType;

		    switch (nodeType)
		    {
			  case eNodeType.exitPointNode: this.Shape = Shape.FromId("Ellipse");
				this.Resize(20, 20);
				this.LayoutTraits[FlowLayoutTraits.LogicID] = "End";
				break;
			  case eNodeType.standardNode: this.Shape = Shape.FromId("RoundRect");
				this.LayoutTraits[FlowLayoutTraits.LogicID] = "NotSpecified";
				break;
			  case eNodeType.decisionNode: this.Shape = Shape.FromId("Decision");
				this.Resize(45, 20);
				this.LayoutTraits[FlowLayoutTraits.LogicID] = "NotSpecified";
				break;
			  case eNodeType.entryPointNode: this.Shape = Shape.FromId("Ellipse");
				this.Text = "Start";
				this.Resize(20, 20);
				this.LayoutTraits[FlowLayoutTraits.LogicID] = "Start";
				break;
		    }

		    if (flowNode != null)
		    {
			  this.FlowNode = flowNode;

			  XmlNode stateNode = null;
			  if (flowNode.State != null)
			  {
				stateNode = statesXml.SelectSingleNode("//*[@id='" + flowNode.State + "']");
			  }
			  else
			  {
				stateNode = statesXml.SelectSingleNode("//*[@id='" + this.Text + "']");
			  }

			  if (stateNode != null)
			  {
				this.StateNode = stateNode;
			  }
		    }
		}
		#endregion

		#region Override Shadow Rendering
		public override void DrawShadow(IGraphics graphics, RenderOptions options)
		{

		}
		#endregion

		#region Accessors
		public Node FlowNode
		{
		    set
		    {
			  m_flowNode = value;
			  this.Text = m_flowNode.ID.ToString();
		    }
		    get
		    {
			  return m_flowNode;
		    }
		}
		public XmlNode StateNode
		{
		    set
		    {
			  m_stateNode = value;
			  this.Text = this.Text + Environment.NewLine + "(State = " + m_stateNode.Name + ")";
		    }
		    get
		    {
			  return m_stateNode;
		    }
		}
		public eNodeType NodeType
		{
		    set
		    {
			  m_nodeType = value;
			  this.Brush = new MindFusion.Drawing.SolidBrush(Color.White);
			  switch (m_nodeType)
			  {
				case eNodeType.exitPointNode:
				    this.Pen = new MindFusion.Drawing.Pen(Color.Red);
				    this.TextColor = Color.Red;
				    break;
				case eNodeType.standardNode:
				    this.Pen = new MindFusion.Drawing.Pen(Color.Orange);
				    this.TextColor = Color.Black;
				    break;
				case eNodeType.decisionNode:
				    this.Pen = new MindFusion.Drawing.Pen(Color.Blue);
				    this.TextColor = Color.Blue;
				    break;
				case eNodeType.entryPointNode:
				    this.Pen = new MindFusion.Drawing.Pen(Color.Green);
				    this.TextColor = Color.Green;
				    break;
			  }
		    }
		    get
		    {
			  return m_nodeType;
		    }
		}
		#endregion
	  }