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VB.NET XML-Document

Posted on 2009-05-04
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Last Modified: 2012-06-27
Hey guy's,

I've a question about VB.NET and XML.
I'm be able to create a new XML-Document.
My question: How can I add some nodes to the already existing XML-Document???

Thanks.
'Sub to create the XML-Document
Private Sub writeXML()
 
        Dim writer As XmlWriter
        writer = XmlWriter.Create("properties.xml")
        writer.WriteStartDocument()
        writer.WriteStartElement("Drinks")
 
    
        writer.WriteStartElement("Drink")
        writer.WriteAttributeString("ID","1")
        writer.WriteElementString("Name", "Blubb")
        writer.WriteElementString("Prize", "10")
        writer.WriteElementString("Amount", "4")
        writer.WriteElementString("Path", "Logo.gif")
        writer.WriteEndElement()
 
        writer.WriteEndDocument()
        writer.Close()
 
        Return Nothing
End Sub
---------------------------------------------------------------------------
'Result looks like this:
  <?xml version="1.0" encoding="utf-8" ?> 
- <Drinks>
   - <Drink ID="1">
        <Name>Blubb</Name> 
        <Prize>10</Prize> 
        <Amount>4</Amount> 
        <Path>Logo.gif</Path> 
     </Drink>
  </Drinks>
----------------------------------------------------------------------------
'I want to add a new node...so the result should looks like this:
  <?xml version="1.0" encoding="utf-8" ?> 
- <Drinks>
   - <Drink ID="1">
        <Name>Blubb</Name> 
        <Prize>10</Prize> 
        <Amount>4</Amount> 
        <Path>Logo.gif</Path> 
     </Drink>
   - <Drink ID="2">
        <Name>Bla</Name> 
        <Prize>5</Prize> 
        <Amount>1</Amount> 
        <Path>Logo2.gif</Path> 
     </Drink>
  </Drinks>

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Question by:ceMo89
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3 Comments
 
LVL 4

Accepted Solution

by:
cauos earned 500 total points
ID: 24294166
you can load the XML file to XmlDocument  and append new XML node to the end of the file and then save this file again.
public sub AddNewNode()
 
        dim doc as New XmlDocument ()
        doc.Load("properties.xml")
 
        dim root as XmlNode = doc.DocumentElement
 
        //Create a new node.
        dim elem as XmlElement = doc.CreateElement("Drink")
        elem.InnerXml = "<yourNodes>mynode</yourNodes>"
 
        //Add the node to the document.
        root.AppendChild(elem)       
        doc.Save("properties.xml")
end sub

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LVL 4

Expert Comment

by:barrislb
ID: 24303046
Hi ceMo89,

I believe this code may be some help to you.  
Private Sub InsertNewNode()
        '-- Declare local variable and load xml file
        Dim doc As New XmlDocument()
        doc.Load("C:\test.xml")
 
        '-- Create a new node and add it to the document.
        Dim Drink As XmlElement = doc.CreateElement("Drink")  
        Drink.SetAttribute("ID", "IdNum")        
       
        '-- Name node
        Dim Name As XmlElement = doc.CreateElement("Name")
        Name.InnerText = "Enter a Name"
        '-- Prize node
        Dim Prize As XmlElement = doc.CreateElement("Prize")
        Prize.InnerText = "Enter a Prize"
        '-- Amount node
        Dim Amount As XmlElement = doc.CreateElement("Amount")
        Amount.InnerText = "Enter the Amount"
        '-- Path node
        Dim Path As XmlElement = doc.CreateElement("Path")
        Path.InnerText = "Enter a Path"
 
        '-- Append the new node to the end of the file.
        doc.DocumentElement.AppendChild(Drink)
        doc.DocumentElement.LastChild.AppendChild(Name)
        doc.DocumentElement.LastChild.AppendChild(Prize)
        doc.DocumentElement.LastChild.AppendChild(Amount)
        doc.DocumentElement.LastChild.AppendChild(Path)
 
        '-- Save the xml file with the new changes.
        doc.Save("C:\test.xml")
        MessageBox.Show("New xml node has been added.", "XML Node Add...", MessageBoxButtons.OK, MessageBoxIcon.Information)
    End Sub

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