The following example returns the first book with the matching author name. The XmlNamespaceManager resolves the default namespace in the XPath expression.
Imports System
Imports System.IO
Imports System.Xml
Public Class Sample
Public Shared Sub Main()
Dim doc As XmlDocument = New XmlDocument()
doc.Load("newbooks.xml")
'Create an XmlNamespaceManager for resolving namespaces.
Dim nsmgr As XmlNamespaceManager = New XmlNamespaceManager(doc.NameTable)
nsmgr.AddNamespace("bk", "urn:newbooks-schema")
'Select the book written by an author whose last name is Atwood.
Dim book As XmlNode
Dim root As XmlElement = doc.DocumentElement
book = root.SelectSingleNode("descendant::bk:book[bk:author/bk:last-name='Atwood']", nsmgr)
Console.WriteLine(book.OuterXml)
End Sub
End Class
using System;
using System.IO;
using System.Xml;
public class Sample
{
public static void Main()
{
XmlDocument doc = new XmlDocument();
doc.Load("newbooks.xml");
// Create an XmlNamespaceManager to resolve the default namespace.
XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("bk", "urn:newbooks-schema");
// Select the first book written by an author whose last name is Atwood.
XmlNode book;
XmlElement root = doc.DocumentElement;
book = root.SelectSingleNode("descendant::bk:book[bk:author/bk:last-name='Atwood']", nsmgr);
Console.WriteLine(book.OuterXml);
}
}
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
XmlDocument^ doc = gcnew XmlDocument;
doc->Load( L"newbooks.xml" );
// Create an XmlNamespaceManager to resolve the default namespace.
XmlNamespaceManager^ nsmgr = gcnew XmlNamespaceManager( doc->NameTable );
nsmgr->AddNamespace( L"bk", L"urn:newbooks-schema" );
// Select the first book written by an author whose last name is Atwood.
XmlNode^ book;
XmlElement^ root = doc->DocumentElement;
book = root->SelectSingleNode( L"descendant::bk:book[bk:author/bk:last-name='Atwood']", nsmgr );
Console::WriteLine( book->OuterXml );
return 0;
}
The example uses the file, newbooks.xml, as input.
<?xml version='1.0'?>
<bookstore xmlns="urn:newbooks-schema">
<book genre="novel" style="hardcover">
<title>The Handmaid's Tale</title>
<author>
<first-name>Margaret</first-name>
<last-name>Atwood</last-name>
</author>
<price>19.95</price>
</book>
<book genre="novel" style="other">
<title>The Poisonwood Bible</title>
<author>
<first-name>Barbara</first-name>
<last-name>Kingsolver</last-name>
</author>
<price>11.99</price>
</book>
</bookstore>