Private Sub ShouldParentsBeChecked(ByVal startNode As TreeNode) The 'Find' function returns an array of nodes, but in this case, it's assumed none or one node is always found: Private Sub AddNode (parentNode As String, nodeText As String) Dim node As New List (Of TreeNode) node.AddRange ( (parentNode, True)) If Not node.Any Then node.Add ( (parentNode, parentNode)) End. Private Sub IsEver圜hildChecked(ByVal parentNode As TreeNode, ByRef checkValue As Boolean)įor Each node As TreeNode In parentNode.NodesĬall IsEver圜hildChecked(node, checkValue) Private Sub CheckAllChildNodes(ByVal parentNode As TreeNode)įor Each childNode As TreeNode In parentNode.Nodes
Private Sub TreeView1_AfterCheck(ByVal sender As Object, ByVal e As TreeViewEventArgs) Handles TreeView1.AfterCheckĬall IsEver圜hildChecked(e.Node.Parent, allChecked)Ĭall ShouldParentsBeChecked(e.Node.Parent)ĭim parentNode As TreeNode = e.Node.Parent Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Loadĭim node As New TreeNode("Parent #" & i.ToString)ĭim childNode As New TreeNode("Child #3")ĭim grandNode As New TreeNode("Grand Child #3") Working example using recursion: Public Class Form1 RemoveHandler TreeView1.AfterCheck, AddressOf TreeView1_AfterCheckįor Each node As TreeNode In e.Node.Nodesįor Each node As TreeNode In e.ĪddHandler TreeView1.AfterCheck, AddressOf TreeView1_AfterCheck Thank you! Private Sub TreeView1_AfterCheck(ByVal sender As Object, ByVal e As TreeViewEventArgs) Handles TreeView1.AfterCheck There are much information on treeview but most of them seems irrelevant =/ Will be great if you can show me a good guide on treeview control. When the CheckBoxes property of a TreeView is set to true, and the StateImageList property is set, each TreeNode that is contained in the TreeView displays the first and second. Check boxes allow the user to select more than one tree node at a time.
TREEVIEW VISUAL BASIC.NET HOW TO
Would appreciate if you can guide me how to make it three. A check box is displayed to the left of both the tree node label and tree node Image, if any. I am getting it to do the following,ġ) If parent is checked, check all child nodes.Ģ) If just one child node is unchecked, uncheck parent node.ģ) If all child nodes are checked, check parent node.Ĭode below only works for 2 layers.
TREEVIEW VISUAL BASIC.NET CODE
I have a 3 layer treeview and is using the code below.
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