Populate TreeView in Background worker

[Developer111]

In vb2005, I have to load a treeview control while loading the form so make the form loading more effective therefore I use Background worker to populate treeview. I tried treeview to pass by ref and faced the error “Cross thread operation not valid: Control” accessed from a thread other than the thread it was created on..”, which makes sense.
Now I want to load treeview in background and return its object then assigning it : Is this the right mechanism?
Can anybody give any idea about this?
Thanks in Advance

[Aimee Bailey]

Are you creating the TreeView object within the background worker, or within your form? If it's created within a seporate thread, id imagine you'll have no end of problems as i believe winforms needs everything within one thread.

A solution is to create the worker yourself, heres a very simple example:

Public Class Form1
 
    Dim results As TreeNode
 
    Private Sub Button1_Click(ByVal sender As System.Object, _
                              ByVal e As System.EventArgs) _
                              Handles Button1.Click
 
        Dim myWorker As New Threading.Thread(AddressOf subA)
        myWorker.Start("noodle")
        While myWorker.IsAlive
            Application.DoEvents()
        End While
 
        If Not IsNothing(results) Then
            TreeView1.Nodes.Add(results)
        End If
 
    End Sub
 
    Sub subA(ByVal word As String)
        results = New TreeNode("Worked!")
        For i = 0 To 1000
            results.Nodes.Add(word)
        Next
    End Sub
 
End Class
 
 

Hope this helps :)


Aimee.

[Developer111]

This is usefull
Thanks AmzBee... :)