[Bug]: Exapanding a TreeGridView Node takes a long time when there are many children

[pauldeboer1987]

Describe the bug
When I have many children in a TreeGridView (like 200) the performance is very slow to expand and collapse the node.

About 250 children takes about 6 seconds on my computer

To Reproduce
Steps to reproduce the behavior:

1. Create a TreeGridView
2. add a node
3. add 250 children nodes
4. click the + or -

Expected behavior
A resonable time of 0.5s sounds reasonable

Desktop (please complete the following information):
Win .NET 6.0 C#
Krypton.Toolkit.Suite.Extended.TreeGridView.Canary
80.23.2.51-beta

[Smurf-IV]

This is a known problem with the C# treeview.
What you can do as a workaround is (If memory serves) the following:

• call the equivalent of SuspendLayout()
• Expand collapse / update / delete rows
• call ResumeLayout(true)

I also have disabled and re-enabled the control before and after the suspends / etc.; to make sure it is obvious that things are happening.

[pauldeboer1987]

Hm.. I tried that.
I also tried suspend paint,
and setting the treegridview.visible to false
it still takes too long.
Similarly, hiding the nodes takes a long time.
this.SuspendLayout(); this.SuspendPaint(); treeGridView1.Visible = false; foreach (var node in treeGridView1.GridNodes) { node.Visible = false; foreach (var subnode in node.Nodes) { subnode.Visible = false; } } treeGridView1.Visible = true; this.ResumePaint(); this.ResumeLayout();
regardless, expanding or collapsing by clicking the + or - does the same.
Unless there is a expand/collapse event to catch, I don't see how I could put the suspend in front/behind.

Funny enough, its actually the set visible to false, or collapsing that takes too long. Expand seems fine.