Xpath query on an XML returns 0 results

S

Spelltox

Member
Joined
Feb 27, 2009
Messages
8
Programming Experience
3-5
Hi guys !

A little something i hope you could help me with -

I've converted an html to XML and now i want to get all the child nodes nested
within a DIV element with a specific attribute (class="itemInfo").

Because the html that the XML is based on changes from time to time i want to use a more "safe" relative root,
(something like : "//div[@class='itemInfo']").

Problem is that i always get 0 nodes ...
I'm sure that something is wrong with my Xpath syntax, just don't know what it is.

Here is my code, please, any help would be appreciated.

VB.NET: 
        Dim doc As New System.Xml.XmlDocument()
        doc.Load("products.xml")
        
        Dim root As System.Xml.XmlElement = doc.DocumentElement
        
        Dim nodes As System.Xml.XmlNodeList = root.SelectNodes("//descendant::div[@class='itemInfo']")
        
        Console.WriteLine(nodes.Count) '<-- always get 0
        
        For Each node As System.Xml.XmlNode In nodes
            Dim name As String = node("name").InnerText
            Dim title As String = node("title").InnerText
            Console.Write("name" & vbTab & "{0}" & vbTab & "title" & vbTab & "{1}", name, title)
        Next

I also tried
VB.NET: 
root.SelectNodes("//div[@class='itemInfo']")
and
VB.NET: 
root.SelectNodes("/*//div[@class='itemInfo']")

but nothing seems to work.

Thanks in advance !
 
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The problem seems to be with the <html> tag attribute :
<html xmlns="http://www.w3.org/1999/xhtml">

As soon as i removed the xmlns attribute my "selectNodes" method started working ...

So now -
Is there a way to still make it working without removing that xmlns attribute ?

Thanks !
 
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So i've searched the net and found something that looks like a solution,
i've changed my code to :

VB.NET: 
        Dim doc As New System.Xml.XmlDocument()
        doc.Load("products.xml")
        
        Dim root As System.Xml.XmlElement = doc.DocumentElement
        
        Dim nsMgr As XmlNamespaceManager = New XmlNamespaceManager(root.OwnerDocument.NameTable)
        nsMgr.AddNamespace("http://www.w3.org/1999/xhtml", "ns")
        nodeList = root.SelectNodes("descendant::ns:div[@class='itemInfo']", nsMgr)
        
        Console.WriteLine(nodes.Count) 
        
        For Each node As System.Xml.XmlNode In nodes
            Dim name As String = node("name").InnerText
            Dim title As String = node("title").InnerText
            Console.Write("name" & vbTab & "{0}" & vbTab & "title" & vbTab & "{1}", name, title)
        Next

But now i'm getting an error :"Namespace prefix 'ns' is not defined."
 
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