I'm using a TableNode with an AnchorPattern specified on each row. I want to be able to add/remove rows from the TableNode dynamically. This works well except when I try to delete the last row in the TableNode. It appears to work fine, but the next time the TableNode is moused-over, an exception is thrown.

Here's the exception stack trace:

System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
   at System.Collections.ArrayList.get_Item(Int32 index)
   at MindFusion.Diagramming.Wpf.TableNode.CellCollection.get_Item(Int32 index)
   at MindFusion.Diagramming.Wpf.TableNode.get_Item(Int32 col, Int32 row)
   at MindFusion.Diagramming.Wpf.TableNode.x3d2277a3b84b3698(AnchorPoint x1bf64e6273c3575c, Visibility x9b4602d5e4f04fcb)
   at MindFusion.Diagramming.Wpf.DiagramNode.x3d2277a3b84b3698(DiagramNode x8d5eca828b99d00c)
   at MindFusion.Diagramming.Wpf.DiagramNode.x3d2277a3b84b3698()
   at MindFusion.Diagramming.Wpf.Diagram.x92bb101faf551658(DiagramNode xda5bf54deb817e37)
   at MindFusion.Diagramming.Wpf.Diagram.xc9ce7799411b196f(Point x70c02b32ea858ee7)
   at MindFusion.Diagramming.Wpf.Diagram.OnPreviewMouseMove(MouseEventArgs e)
 

Here is the simple code to replicate this problem:

AnchorPattern anchorPattern = new AnchorPattern(
new[]
{
   new AnchorPoint(50, 50, true, false, Brushes.Green, 0){MarkStyle = MarkStyle.Custom},
});

// defaults to 4 rows and 2 columns
TableNode tableNode = new TableNode();

tableNode.Rows[0].AnchorPattern = anchorPattern;
tableNode.Rows[1].AnchorPattern = anchorPattern;
tableNode.Rows[2].AnchorPattern = anchorPattern;
tableNode.Rows[3].AnchorPattern = anchorPattern;

Diagram.Nodes.Add(tableNode);

tableNode.DeleteRow(3);
 

I've noticed that the exception only occurs when using an AnchorPattern that uses a specific column in the row. If I set the Column property back to the default value of -1 right before deleting, the exception is not thrown.

Like this:

tableNode.Rows[3].AnchorPattern.Points[0].Column = -1;
tableNode.DeleteRow(3);
 

That is a bad hack though, as we have different AnchorPatterns that could be used with varying numbers of points. Plus other odd things start happening with the adding/removing of other rows.

Thanks that fixed that specific issue. However that same exception is still being thrown if I try to resize the TableNode after deleting a row.

Here is the slightly tweaked code showing this problem:

AnchorPattern anchorPattern = new AnchorPattern(
new[]
{
    new AnchorPoint(50, 50, true, false, Brushes.Green, 0){MarkStyle = MarkStyle.Custom},
});

// defaults to 4 rows and 2 columns
TableNode tableNode = new TableNode();

tableNode.Rows[0].AnchorPattern = anchorPattern;
tableNode.Rows[1].AnchorPattern = anchorPattern;
tableNode.Rows[2].AnchorPattern = anchorPattern;
tableNode.Rows[3].AnchorPattern = anchorPattern;

Diagram.Nodes.Add(tableNode);

tableNode.MouseDown += delegate
{
    tableNode.DeleteRow(2);
    tableNode.Bounds = new Rect(50, 50, 200, 150);
};
 

As soon as the Bounds property is set, it causes the exception to be thrown.

The same problem occurs if the Resize method is called instead of setting the Bounds.