Hi,

I'm trying to do treeview checkbox function in Visual Studio 2005 using VB.Net. I have successfully loaded the treeview checkbox as you can see in my attachment. But the problem starts here. I have designed the form before I inserted any code inside of it so my programming is mainly trying to connect to the instance in the design.

This are the following function I want to perform on the treeview checkbox:

1. When I select the ITAD checkbox, all the nodes under it will be checked automatically
2. When I select the Raw checkbox, all node under it will be selected.

When I search the internet on how to do this, I cannot understand most of them. Mainly because I'm new at this programming practice. So, I'm asking for any guidance on how to do this.

Any contribution and assistance is greatly appreciated.

Thanks

Hi,

I am not very good at Treeviews either, however I created this code. Check it and let me know if this works for you.

    Private Sub TreeView1_AfterCheck(ByVal sender As Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterCheck
        If e.Node.Checked = True Then
            CheckNode(e.Node.Nodes)
        Else
            UnCheckNode(e.Node.Nodes)
        End If
    End Sub

    Public Function CheckNode(ByVal _nodeCollection As TreeNodeCollection) As TreeNode
        Dim tmpNode As TreeNode
        For Each _child As TreeNode In _nodeCollection
            _child.Checked = True
            tmpNode = CheckNode(_child.Nodes)
            If Not tmpNode Is Nothing Then
                Return tmpNode
            End If
        Next
        Return Nothing
    End Function

    Public Function UnCheckNode(ByVal _nodeCollection As TreeNodeCollection) As TreeNode
        Dim tmpNode As TreeNode
        For Each _child As TreeNode In _nodeCollection
            _child.Checked = False
            tmpNode = UnCheckNode(_child.Nodes)
            If Not tmpNode Is Nothing Then
                Return tmpNode
            End If
        Next
        Return Nothing
    End Function

Hope this helps.

kasbaba

There are a couple ways to handle this situation, I will show both. The first (and probably my choice) would be to create a procedure that checks the status of the parent node and loop through each child node checking or unchecking them based on the status of the parent node. You can then call this procedure in the AfterCheck Event of the TreeView



The second is to just handle it all in the [b]AfterCheck Event[/url], like this

Private Sub myTree_AfterCheck(ByRef sender As Object, ByRef e As TreeViewEventArgs) Handles MyTree.AfterCheck
	Dim currentNode As TreeNode
	For Each currentNode In e.Node.Nodes
		currentNode.Checked = e.Node.Checked
	Next
End Sub

I prefer the first way because it also un-checks the child nodes if the parent is un-checked. Hope this helps

I've got it running now. Thank you all for your help.