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XElement.CreateNavigator Method

.NET Framework 3.5

Creates an XPathNavigator for an XNode.

This member is overloaded. For complete information about this member, including syntax, usage, and examples, click a name in the overload list.

  NameDescription
Public Extension Method CreateNavigator() Creates an XPathNavigator for an XNode. (Defined by Extensions.)
Public Extension Method CreateNavigator(XmlNameTable) Creates an XPathNavigator for an XNode. The XmlNameTable enables more efficient XPath expression processing. (Defined by Extensions.)
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You cannot edit the XML tree by using the XPathNavigator that is returned by this method. The CanEdit property returns false.

You cannot create an XPathNavigator for a XDocumentType node. Document types do not participate in the XPath data model.

Namespace declarations are reported from left to right. In contrast, for XmlDocument namespaces are reported from right to left. This is conformant behavior because namespace declarations are not ordered in the XPath data model.

The method MoveToId is not supported for navigators that are returned by this method.

You can use this method to perform an XSLT transformation. You can create an XML tree, create an XPathNavigator from the XML tree, create a new document, and create a XmlWriter that will write into the new document. Then, you can invoke the XSLT transformation, passing the XPathNavigator and XmlWriter to the transformation. After the transformation successfully completes, the new XML tree is populated with the results of the transformation.

To perform an XSLT transformation, you can use either an XmlReader or an XPathNavigator. The two approaches have different performance characteristics. Some transformations will execute faster when using an XmlReader, and others will execute faster when using a XPathNavigator. If performance is a concern, we recommend that you experiment with each approach to determine which will perform better in your circumstances.

string xslMarkup = @"<?xml version='1.0'?>
<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' version='1.0'>
    <xsl:template match='/Parent'>
        <Root>
            <C1><xsl:value-of select='Child1'/></C1>
            <C2><xsl:value-of select='Child2'/></C2>
        </Root>
    </xsl:template>
</xsl:stylesheet>";

XDocument xmlTree = new XDocument(
    new XElement("Parent",
        new XElement("Child1", "Child1 data"),
        new XElement("Child2", "Child2 data")
    )
);

XDocument newTree = new XDocument();
using (XmlWriter writer = newTree.CreateWriter()) {
    // Load the style sheet.
    XslCompiledTransform xslt = new XslCompiledTransform();
    xslt.Load(XmlReader.Create(new StringReader(xslMarkup)));

    // Execute the transform and output the results to a writer.
    xslt.Transform(xmlTree.CreateNavigator(), writer);
}

Console.WriteLine(newTree);

This example produces the following output:

<Root>
  <C1>Child1 data</C1>
  <C2>Child2 data</C2>
</Root>

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