We help IT Professionals succeed at work.

We've partnered with Certified Experts, Carl Webster and Richard Faulkner, to bring you two Citrix podcasts. Learn about 2020 trends and get answers to your biggest Citrix questions!Listen Now

x

How to Quickly Find a TreeNode

OFGemini
OFGemini asked
on
Medium Priority
323 Views
Last Modified: 2010-04-23
Hi I currently search my tree by using a recursive function.

    Public Function FindANodeRecursive(ByVal nodeList As TreeNodeCollection, ByVal myId As Object) As TreeNode
        Dim targetNode As TreeNode = Nothing
        For Each aNode As TreeNode In nodeList

            'searches for Node with matching Id.  the ID is stored in treenode.tag
            If aNode.Tag = myId Then

                Return aNode
                Exit Function

            ElseIf aNode.Nodes.Count > 0 Then

                'if nodes is a folder and has children scan it
                targetNode = Me.FindANodeRecursive(aNode.Nodes, myId)
                If Not targetNode Is Nothing Then
                    Return targetNode
                End If

            End If
        Next

        Return targetNode

    End Function

Something the recursive function is very slow.  Is there a better way of finding a treenode??

 One way I was thinking of was using a hashtable with treenode's tag as the key, and the treenode as the value.  This way I can just search the hashtable to find the right node.    Would this be a good idea? also Is there a treenode added event that can listen to when A treenode is added to my tree??  This way I don't have to go through all my code and adding the new keys each time I add a node.

Comment
Watch Question

Dim a As New TreeView
        a.Nodes.Find("nameoftreenode", True)

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts
Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.