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populating a treeview from a xml source

Posted on 2009-04-06
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Last Modified: 2013-11-08
I am really very new to asp.net. I have a code below that I am using to populate a treeview.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
 
      Try
            ' SECTION 1. Create a DOM Document and load the XML data into it.
            Dim dom As New System.Xml.XmlDocument
            dom.Load("c:\uac\questionnaire.xml")
 
            ' SECTION 2. Initialize the treeview control.
            TreeView1.Nodes.Clear()
            TreeView1.Nodes.Add(New TreeNode(dom.DocumentElement.Name))
 
            Dim tNode As New TreeNode()
            tNode = TreeView1.Nodes(0)
 
            ' SECTION 3. Populate the TreeView with the DOM nodes.
            AddNode(dom.DocumentElement, tNode)
            ' SECTION 4. Create a new TreeView Node with only the child nodes.
            Dim nodelist As System.Xml.XmlNodeList = dom.SelectNodes("//child")
            Dim cDom As New System.Xml.XmlDocument()
            cDom.LoadXml("<children></children>")
            Dim node As System.Xml.XmlNode
            For Each node In nodelist
                Dim newElem As System.Xml.XmlNode = cDom.CreateNode(System.Xml.XmlNodeType.Element, node.Name, node.LocalName)
                newElem.InnerText = node.InnerText
                cDom.DocumentElement.AppendChild(newElem)
            Next
 
            TreeView1.Nodes.Add(New TreeNode(cDom.DocumentElement.Name))
            tNode = TreeView1.Nodes(1)
            AddNode(cDom.DocumentElement, tNode)
 
            TreeView1.ExpandAll()
 
        Catch xmlEx As System.Xml.XmlException
            MsgBox(xmlEx.Message)
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
 
    End Sub
    Private Sub AddNode(ByRef inXmlNode As System.Xml.XmlNode, ByRef inTreeNode As TreeNode)
        Dim xNode As System.Xml.XmlNode
        Dim tNode As TreeNode
        Dim nodeList As System.Xml.XmlNodeList
        Dim i As Long
 
        ' Loop through the XML nodes until the leaf is reached.
        ' Add the nodes to the TreeView during the looping process.
        If inXmlNode.HasChildNodes() Then
            nodeList = inXmlNode.ChildNodes
            For i = 0 To nodeList.Count - 1
                xNode = inXmlNode.ChildNodes(i)
                inTreeNode.ChildNodes.Add(New TreeNode(xNode.Name))
                tNode = inTreeNode.ChildNodes(i)
                AddNode(xNode, tNode)
            Next
        Else
            ' Here you need to pull the data from the XmlNode based on the
            ' type of node, whether attribute values are required, and so forth.
            inTreeNode.Text = (inXmlNode.OuterXml).Trim
        End If
    End Sub

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Question by:Anthony Matovu
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