FindNode.... not found...

Hi folks,

I am messing around with treeviews and listviews, and I am missing something.

In the documentation I encounter commands like FindNode, TreeNodeConverter, ConvertFromString etc. But I cannot get it to work. In the sample provided by MS (below) it results in the errors like "FindNode is not a member of "System.Windows.Forms.TreeView".

Also the parameters like ValuePath are not found (not member of treeNode). I tried to import the namespace mentioned, but it is not "there".

Have I stumbled on a difference between VBA and VS2005, or is it just "not ready yet". Searching the internet yields no proper samples... ..

I intend to use the Tree- and ListView controls a lot in the project I am currently working on, and proper understanding of the matter is essential. Even Petroutsos book does not help me out.

Any leads

Thymen

Sub Button_Click(ByVal sender As Object, ByVal e As EventArgs)

' Find the node specified by the user.

Dim node As TreeNode = TreeView.FindNode(Server.HtmlEncode(ValuePathText.Text))

If Not node Is Nothing Then

' Indicate that the node was found.

Message.Text = "The specified node (" & node.ValuePath & ") was found."

Else

' Indicate that the node is not in the TreeView control.

Message.Text = "The specified node (" & ValuePathText.Text & ") is not in this TreeView control."

End If

End Sub

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FindNode.... not found...

osamaT

Hi Thymen... I'm afraid I have a little bit of bad news for. You made a mistake that is easy to make:

System.Web.UI.WebControls.TreeNode.ValuePath() As String

Web.UI means it's for ASP not Windows.Forms. When you are looking up controls, unless you are programming for the web, you cant use this class. that's what this doesn't work and why you can't find it. Have you been introduced to the Object Browser yet It's icon with the pink in it (my favorite!!!). Open up the object browser and browse through it. Before you're done enter: ValuePath path into the window and see what you see.

Also if you enter Find... eventually you'll see this:

System.Windows.Forms.TreeNodeCollection.Find(String, Boolean) As System.Windows.Forms.TreeNode()

Michael C. Neel

there's a really good example at recursing through nodes in help. It's much shorter than that.

This is roughly the example from Help.

' Call the procedure using the top nodes of the treeview.
Private Sub CallRecursive(ByVal aTreeView As TreeView)
  Dim n As TreeNode
  For Each n In aTreeView.Nodes
   PrintRecursive(n)
  Next
End Sub

Private Sub PrintRecursive(ByVal n As TreeNode)
  System.Diagnostics.Debug.WriteLine(n.Text)
  MessageBox.Show(n.Text)
  Dim aNode As TreeNode
  For Each aNode In n.Nodes
   PrintRecursive(aNode)
  Next
End Sub

djshades2004
ReneeC,

thanks.... something new every day..

I whipped up something myself.. but I'll try your stuff too.

Private Function fnFindNodeRecursive(ByVal n As TreeNode, ByVal aPath As String) As TreeNode

fnFindNodeRecursive = Nothing

For Each node As TreeNode In n.Nodes

If node.FullPath = aPath Then

fnFindNodeRecursive = node

Exit Function

End If

fnFindNodeRecursive = fnFindNodeRecursive(node, aPath)

If fnFindNodeRecursive IsNot Nothing Then Exit Function

Next

End Function

Private Function fnFindNode(ByVal aTreeView As TreeView, ByVal aPath As String) As TreeNode

fnFindNode = Nothing

For Each node As TreeNode In aTreeView.Nodes

If node.FullPath = aPath Then

fnFindNode = node

Exit Function

End If

fnFindNode = fnFindNodeRecursive(node, aPath)

If fnFindNode IsNot Nothing Then Exit Function

Next node

End Function
FindNode.... not found...

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