Changing Treeview's selectedNode in Afterselect event.

18 Jan 2005 9:07 AM

Debi

Hi,
   I've a problem with setting the selectednode in a treeview. When a user
clicks a node on the tree, I save the data for the previous node, and store
the newnode in a variable in the Mouse up event. Then I reuild the tree, and
set the SelectedNode to the newnode. I can see that the selected node is
correct till the AfterSelect event - correct in BeforeSelect event. But in
the AFterSelect the SelectedNode changes to a random node. I tried to set the
correct node in the AfterSelect, but it shows this random node. If I set the
selected node to nothing, it becomes nothing, but I cannot set it to this
newnode selected by the user.Can someone suggest what to do here.

Thanx in Advance,
Debi

***************************************
Private Sub tvSchedule_AfterSelect(ByVal sender As Object, ByVal e As
System.Windows.Forms.TreeViewEventArgs) Handles tvSchedule.AfterSelect
        Try
            Dim Mydate As Date
            Dim CurrRow As DataRow
            Dim drTreeTag As DataRow
            If bTreeMove Or bReload Then Exit Sub
            If Not tvSchedule Is Nothing And Not CurrTreeNode Is Nothing Then
                If bBugFix And (tvSchedule.SelectedNode.Text <>
CurrTreeNode.Text) Then
                    tvSchedule.SelectedNode = Nothing
                    tvSchedule.SelectedNode = CurrTreeNode
                    bBugFix = False
                End If
            End If
            CurrTreeNode = tvSchedule.SelectedNode ----------------------------------------------------------------------------------------------
Private Sub tvSchedule_MouseUp(ByVal sender As Object, ByVal e As
System.Windows.Forms.MouseEventArgs) Handles tvSchedule.MouseUp
        Try
            Dim pt As Point
            pt = New Point(e.X, e.Y)
            CurrTreeNode = CType(sender, TreeView).GetNodeAt(pt)
            If Not bReload Then
                tvSchedule.SelectedNode = CurrTreeNode
            End If
            If bReload Then
                ReloadTree()
                bBugFix = True
            End If --------------------------------------------------------------------------------------------
Private Sub tvSchedule_AfterExpand(ByVal sender As Object, ByVal e As
System.Windows.Forms.TreeViewEventArgs) Handles tvSchedule.AfterExpand
        If Not bTreeLoad Then tvSchedule.SelectedNode = e.Node()
    End Sub --------------------------------------------------------------------------------------------
Private Sub tvSchedule_Click(ByVal sender As Object, ByVal e As
System.EventArgs) Handles tvSchedule.Click
        Try

            bTreeClick = True
            savedata()
            bTreeClick = False
        Catch ex As Exception
            ShowMessage("Exception Tree Click", AppName, 1)
        Finally

        End Try

    End Sub

19 Jan 2005 10:52 AM

Claes Bergefall

You're saving the selected node in a variable and then clearing
and repopulating the tree, correct?

Do you insert it again? I.e. do you do
tvSchedule.Nodes.Add(CurrTreeNode)?

If you don't then CurrTreeNode doesn't exist in
the tree anymore (since you cleared the tree), so
you won't find it there.

The SelectedNode property selects the EXACT instance
of the node that you're providing. If that instance isn't
inserted into the tree nothing will happen. It doesn' matter
if there is a node with the same text etc. If it's not the
exact same instance nothing will happen

/claes

Show quoteHide quote

"Debi" <debi@nospam.com> wrote in message
news:B3AE0F60-6514-41B6-926D-60925388D7B6@microsoft.com...
> Hi,
>    I've a problem with setting the selectednode in a treeview. When a
user
> clicks a node on the tree, I save the data for the previous node, and
store
> the newnode in a variable in the Mouse up event. Then I reuild the tree,
and
> set the SelectedNode to the newnode. I can see that the selected node is
> correct till the AfterSelect event - correct in BeforeSelect event. But in
> the AFterSelect the SelectedNode changes to a random node. I tried to set
the
> correct node in the AfterSelect, but it shows this random node. If I set
the
> selected node to nothing, it becomes nothing, but I cannot set it to this
> newnode selected by the user.Can someone suggest what to do here.
>
> Thanx in Advance,
> Debi
>
> ***************************************
> Private Sub tvSchedule_AfterSelect(ByVal sender As Object, ByVal e As
> System.Windows.Forms.TreeViewEventArgs) Handles tvSchedule.AfterSelect
>         Try
>             Dim Mydate As Date
>             Dim CurrRow As DataRow
>             Dim drTreeTag As DataRow
>             If bTreeMove Or bReload Then Exit Sub
>             If Not tvSchedule Is Nothing And Not CurrTreeNode Is Nothing
Then
>                 If bBugFix And (tvSchedule.SelectedNode.Text <>
> CurrTreeNode.Text) Then
>                     tvSchedule.SelectedNode = Nothing
>                     tvSchedule.SelectedNode = CurrTreeNode
>                     bBugFix = False
>                 End If
>             End If
>             CurrTreeNode = tvSchedule.SelectedNode
> --------------------------------------------------------------------------
--------------------
> Private Sub tvSchedule_MouseUp(ByVal sender As Object, ByVal e As
> System.Windows.Forms.MouseEventArgs) Handles tvSchedule.MouseUp
>         Try
>             Dim pt As Point
>             pt = New Point(e.X, e.Y)
>             CurrTreeNode = CType(sender, TreeView).GetNodeAt(pt)
>             If Not bReload Then
>                 tvSchedule.SelectedNode = CurrTreeNode
>             End If
>             If bReload Then
>                 ReloadTree()
>                 bBugFix = True
>             End If
> --------------------------------------------------------------------------
------------------
> Private Sub tvSchedule_AfterExpand(ByVal sender As Object, ByVal e As
> System.Windows.Forms.TreeViewEventArgs) Handles tvSchedule.AfterExpand
>         If Not bTreeLoad Then tvSchedule.SelectedNode = e.Node()
>     End Sub
> --------------------------------------------------------------------------
------------------
> Private Sub tvSchedule_Click(ByVal sender As Object, ByVal e As
> System.EventArgs) Handles tvSchedule.Click
>         Try
>
>             bTreeClick = True
>             savedata()
>             bTreeClick = False
>         Catch ex As Exception
>             ShowMessage("Exception Tree Click", AppName, 1)
>         Finally
>
>         End Try
>
>     End Sub