Question

I’m trying to add nodes from a dataTable into a treeview. My problem isn’t the adding of the nodes however, it is displaying them. My loop goes through and adds every node. I have a text box that displays the total nodes correctly. However the treeview displays nothing. Am I missing some display property?

Thank you for your help!

    oldComments.DataBind()
    Dim count As Integer = 0
    Dim TreeView1 As TreeView = New TreeView
    ' TreeView1.FindNode("My Node").ChildNodes().Add(New TreeNode("Test This"))
    For Each row As DataRow In dsData.Rows
        Dim node As TreeNode = New TreeNode(row("UpdateTimeStamp").ToString)

        Dim node2 As TreeNode = New TreeNode((count.ToString + " - Count"), "test")
        TreeView1.Nodes.Add(node2)
        TreeView1.Nodes.Add(node)
        TreeView1.Nodes(0).ChildNodes().Add(node)
    Next
    TreeView1.ExpandAll()
    status.Text = TreeView1.Nodes.Count

Then the ASP:

    <asp:TreeView ID="TreeView1" runat="server">
        <Nodes>
            <asp:TreeNode Text="My Node" Value="My Node"></asp:TreeNode>
        </Nodes>
    </asp:TreeView>

I have added one node to see where it was displaying / try to use the find control to add a new child node and that didn’t work. Suggestions?

Thank you.

Answer 1

You are assigning the same node twice. Once to the treeview nodes and once to the child nodes of another node. You do not need to assign a node to the treeview itself if you are adding a child to some node. Change the code to

TreeView1.Nodes.Add(node2)
node2.ChildNodes().Add(node)