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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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