Selecting a given Node in a TreeView by code

  • Thread starter Thread starter Etienne-Louis Nicolet
  • Start date Start date
E

Etienne-Louis Nicolet

Might be a stupid question, but...

How do I select a Node in a TreeView by code?

Background: If the user selects a node which has childs, I'd like the code
to select the first child instead. I use VB in Visual Studio 2008.

Many thanks for any suggestions,
Etienne
 
Might be a stupid question, but...

How do I select a Node in a TreeView by code?

Background: If the user selects a node which has childs, I'd like the code
to select the first child instead. I use VB in Visual Studio 2008.
Click to expand...

You loop through the nodes and find the one you want (i.e., get a reference
to that TreeNode object). Then, from what I can determine, you set the
Checked property of the node to True. Personally, I would have created a
Selected property, but there's only the read-only IsSelected property.
 
Jeff Johnson said:
You loop through the nodes and find the one you want (i.e., get a
reference to that TreeNode object). Then, from what I can determine, you
set the Checked property of the node to True. Personally, I would have
created a Selected property, but there's only the read-only IsSelected
property.
Click to expand...
Thank you Jeff, but unfortunately this seems to work only if you set the
TreeView.CheckBoxes to True.

Since in my case I'd like to prevent multiple selections, I set the
CheckBoxes-property to false. Setting the Checked-property of the node did
not select it.

Any other ideas?

Many thanks & kind regards,
Etienne
 
Etienne-Louis Nicolet said:
Might be a stupid question, but...

How do I select a Node in a TreeView by code?
Click to expand...

Set the selectedNode property.
Background: If the user selects a node which has childs, I'd like
the code to select the first child instead. I use VB in Visual
Studio 2008.
Click to expand...

Private Sub tvw_BeforeSelect( _
ByVal sender As Object, _
ByVal e As System.Windows.Forms.TreeViewCancelEventArgs) _
Handles tvw.BeforeSelect

If e.Node.Nodes.Count > 0 Then
e.Cancel = True
tvw.SelectedNode = e.Node.Nodes(0)
End If

End Sub

Untested Code! Try AfterSelect event if it doesn't work.


Armin
 
tvw.SelectedNode = e.Node.Nodes(0)
Click to expand...

Damn I feel stupid. This is how you do it in VB6 for the list view, at
least, and probably the tree view too (don't use them much). How could I
forget that?! I've been using the .NET list view so much recently that I had
"do it at the item level" on the brain.
 
Armin Zingler said:
Set the selectedNode property.


Private Sub tvw_BeforeSelect( _
ByVal sender As Object, _
ByVal e As System.Windows.Forms.TreeViewCancelEventArgs) _
Handles tvw.BeforeSelect

If e.Node.Nodes.Count > 0 Then
e.Cancel = True
tvw.SelectedNode = e.Node.Nodes(0)
End If

End Sub

Untested Code! Try AfterSelect event if it doesn't work.


Armin
Click to expand...

Armin, Jeff,

Thank you very much. Armin's suggestion did the trick!

Regards,
Etienne
 
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