How to Find Child Nodes in a TreeView Control

This will hopefully be a simple question...

I have a treeview control (Treeview1) that gets filled programmatically with different numbers of nodes and child nodes. I am trying to find out how many child nodes one particular node has and what the text of these child nodes are. I know the parent node's name is "Drives" and that each of the child nodes under this node will be a drive letter followed by a colon and backslash (such as C:\ or D:\).

Is there a way to find how many of these child nodes exist and what their names are

I'm not sure if there's an easy way to use Nodes.Find, but it seems to be leading me nowhere.

What's a good way to accomplish this

Thanks.

-- Jim

Answer this question

How to Find Child Nodes in a TreeView Control

mr. robot
Any chance you can you translate that into VB

Thanks for your help.

-- Jim
sindhu
I don't see the problem, you can iterator over the TreeNodes.
poopiman
Thanks, ReneeC... I didn't realize that each node also has a Nodes property. I thought you could only get to that from the TreeView object. That makes life a lot easier!

-- Jim

shron

I've writen a little example:

public static TreeNode[] GetInnerNodes( TreeNode node )
{
System.Collections.ArrayList nodeBuffer = new System.Collections.ArrayList( node.Nodes.Count );

foreach( TreeNode innerNode in node.Nodes )
{
TreeNode[] innerNodes = GetInnerNodes( innerNode );
nodeBuffer.AddRange( innerNodes );
nodeBuffer.Add( innerNode );
}

return (TreeNode)nodeBuffer.ToArray( typeof( TreeNode ) );
}

The method will give any nodes that are in a specified TreeNode in a Array. The code is writen out of the head, but i think you will get the point. You can use the Lenght property of the returned array and iterate over it to get specific properties like Text.

Richard Broida
Well, if I try to iterate through them using something like...

Dim Chk4Drives As TreeNode
For Each Chk4Drives In Me.TreeView1.Nodes
If Chk4Drives.Text = "C:\" Then
MsgBox(Chk4Drives.Index)
End If
Next

It seems to only iterate through the top level nodes and not the child nodes.

-- Jim
TheKingKev

To recurse through nodes you can call this passing a node.

Dim AL as new Arralist

Dim NodeCount as Integer

Private Sub SetupNodesForDisplay(ByVal Node As TreeNode)

      AL.Clear()

NodeCount = 0

        For Each n As TreeNode In Node.Nodes

            RecursiveGetnode(n)

        Next

    End Sub

    Private Sub RecursiveGetnode(ByVal n As TreeNode)

        Count +=1

      Al.Add(n.text)

        For Each aNode As TreeNode In n.Nodes

            RecursiveGetnode(aNode)

        Next

    End Sub

A node has a node collection which can be be interogated

Dim A as integer = Node.Nodes.Count ‘For a given level

The example above collects the total count and a list of names.

There is also the Treeview.Find Method which reguires a node path as an argument.
Kelly Dyjur
This is what my example does also, for every TreeNode it calls the method again.
How to Find Child Nodes in a TreeView Control

Answer this question