XML in Treeview

XML in Treeview

• Gunnar Adler

  Can't help much unless I know the structure of your XML file

  You'll have adjust the Xpath (the "//title" part) expression, and get the values for each node accordingly.

  
  
  

• PQSIK

  I got that thats great but I am not at all knowledgable in this perticular thing XML and VB.net I have me class done I am having a problem setting and accessing the properties

   I am new at .NET as well as XML and I am trying to make my selections  navigate to a node that does not show in the treeview. The second child of the XML doc please give a good detailed information for me to help me understand.....

   

  
  
  

• Daniel Hilgarth

  Hi,

  In order to process XML files you need to be sure of its structure, suppose your complete xml document looks like this:

  <books>

  <title>Herbs</title>
  <link>C:\Documents and Settings\HP_Owner\My Documents\Dominion\Content\Database\herbs.html</link>
  <description>a book on herbs</description>

  <title>Book2</title>
  <link>c:\books\books2.html</link>
  <description>second book</description>

  <!-- and so on -->

  </book>

  The relationship between the elements is that for every "title" element, it has 2 siblings(elements on the same level), it's next sibling is the link, and the one after is the description.

  Here's some sample code for you to play with, create a new form and drop a treeview on it:

  Imports System.Xml

  Public Class Form1

  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

  TreeView1.ShowNodeToolTips = True
  Dim doc As New XmlDocument

  'change the path to the actual location of your xml document
  doc.Load("C:\books.xml")

  Dim tnode As TreeNode

  For Each node As XmlNode In doc.SelectNodes("//title")
  tnode = TreeView1.Nodes.Add(node.InnerText)
  tnode.Tag = node.NextSibling.InnerText
  tnode.ToolTipText = node.NextSibling.NextSibling.InnerText
  Next
  End Sub

  Private Sub TreeView1_NodeMouseDoubleClick(ByVal sender As Object, ByVal e As System.Windows.Forms.TreeNodeMouseClickEventArgs) Handles TreeView1.NodeMouseDoubleClick
  If e.Node.Tag IsNot Nothing Then
  Process.Start(e.Node.Tag)
  End If
  End Sub

  End Class
  

  
  
  

• JZ1000

  Make a new class and then create an instance of the class that contains the items in your XML doc .

  Your class properties could be "title", "link", "description". or something of the sort.

  There is a XML tool that converts an XML document to a class, look here in msdn for the tool "xsd.exe" I used it with great sucess for a XML doc that had many child nodes that I needed to use as properties of a custom object. You have to use the command line to use it but it sure saved me time, I didn't have to code the class module at all. xsd.exe did it for me! Once I created a new instance of my class it was easy to acess the properties, which would assist you in setting the properties of your tree view.

  Use a collection to iterate through all your other "books" in the collection and add them to your tree view.

  
  

• davidtcf

  Ryan I am sorry if I seem abrupt its a little hard for me with this company. They are new to .net and so am I. Im coming from a VB6 background but I am trying...... Anyway here is my XML structure....

  < xml version="1.0" >

  <index>
  <titles id = "Title">
  <title id = "Herbs">
  <link id = "url">C:\Documents and Settings\HP_Owner\My Documents\Dominion\Content\Database\herbs.htm</link>
  <description> a book on herbs</description>
  </title>
  <title id = "Herbs1">
  <link id = "url">C:\Documents and Settings\HP_Owner\My Documents\Dominion\Content\Database\herbs1.htm</link>
  <description> another book on herbs</description>
  </title>
  </titles>
  </index>

  the links will be either on the users harddrive or on a network drive, but that shouldnt matter.... The description should appear in the tooltip section. I really thanks for your help.... BTW in that last section you gave me it kept saying that the innertext was a null refrence. I have tried to use others source but that what it keeps giving me even on prepackaged source with prepackaged XML... no idea why....

  thanks again for your effort

  
  
  

• corbin

  A few minor adjuctments and it flew thanks very much......
  
  

• Xenon86

  the .innertext gives me either a new instance is required error or it gives me all of the inner text for each child node thereafter. Close thanks Im on the right track but not there. I am on a time crunch if you can help more please do.......
  
  

• Sharon.Danino

  The title is the "id" attribute of the "title" element

  The link element and decription elements are the child elements of title, here's some more code you can try:

  Imports System.Xml

  Public Class Form1

  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

  TreeView1.ShowNodeToolTips = True
  Dim doc As New XmlDocument

  'change the path to the actual location of your xml document
  doc.Load("C:\titles.xml")

  Dim tnode As TreeNode

  For Each node As XmlNode In doc.SelectNodes("//title")
  Dim booktitle As XmlAttribute = node.Attributes("id")
  Dim linkNode As XmlNode = node.SelectSingleNode("descendant::link")
  Dim descNode As XmlNode = node.SelectSingleNode("descendant::description")

  If Not booktitle Is Nothing Then
  tnode = TreeView1.Nodes.Add(node.Attributes("id").InnerText)
  Else
  tnode = TreeView1.Nodes.Add("Unknown book")
  End If

  If Not linkNode Is Nothing Then
  tnode.Tag = linkNode.InnerText
  End If

  If Not descNode Is Nothing Then
  tnode.ToolTipText = descNode.InnerText
  Else
  tnode.ToolTipText = "No description"
  End If

  Next
  End Sub

  Private Sub TreeView1_NodeMouseDoubleClick(ByVal sender As Object, ByVal e As System.Windows.Forms.TreeNodeMouseClickEventArgs) Handles TreeView1.NodeMouseDoubleClick
  If e.Node.Tag IsNot Nothing Then
  Process.Start(e.Node.Tag)
  End If
  End Sub

  End Class

  But as I state before in order to correctly process an XML files you will need to know it's structure, and map the relationships of the elements to your code. Here's a link on MSDN library you may find useful:

  http://msdn.microsoft.com/library/default.asp url=/library/en-us/cpguide/html/cpconemployingxmlinnetframework.asp
  

  
  
  
• XML in Treeview