[Mono-bugs] [Bug 445130] New: TreeView ExpandAll() is very slow

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=445130


           Summary: TreeView ExpandAll() is very slow
           Product: Mono: Class Libraries
           Version: 2.0
          Platform: i586
        OS/Version: Windows XP
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: alisdair_little at yahoo.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Description of Problem:
Using TreeView ExpandAll is very slow with large amounts of nodes, this is
despite wrapping the ExpandAll call in BeginUpdate and EndUpdate.

Doing ExpandAll without mono for 3272 nodes takes less than one second.
Under Mono - Windows XP & Linux Ubuntu: 42 Seconds

I am overriding DrawNode (no graphics, just colored text)

Steps to reproduce the problem:
1. Add a treeview to a form 
2. Create a custom node draw method
  2.1. This can be as simple as using e.Graphics.DrawString
3. Call treeview.BeginUpdate()
4. Add a large number of nodes
5. Call treeview.ExpandAll()
6. Call treeview.EndUpdate()

IMPORTANT
I tried removing BeginUpdate and EndUpdate and it took the same amount of time
(47 seconds). This does seem to point to these statements being ignored.


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