Parameters

namespaceUri

The URI of the namespace to associate with the extension object.

extension

The extension object.

Remarks

The static and instance methods of extension are made available to XSLT stylesheets via XPath function calls.

The arguments and return type of extension methods can be the basic numeric types, strings, System.Xml.XPath.XPathNavigator objects, and System.Xml.XPath.XPathNodeIterator objects. Using XPathNavigators and XPathNodeIterators allows the extension method to receive and pass back node sets.

Only one extension object may be associated with any namespace, and the http://www.w3.org/1999/XSL/Transform namespace may not be used.

The following example makes a string length function available to an XSLT stylesheet.

C# Example

class MyExtObject {
	public int GetStringLength(string s) {
		return s.Length;
	}
}

(...elsewhere...)

XsltArgumentList args = new XsltArgumentList();
args.AddExtensionObject("http://www.mydomain.com/mynamespace", new MyExtObject());
XmlReader result = stylesheet.Transform(doc, args);
  

The stylesheet accesses this function by declaring the namespace and then using XPath:

XML Example

<template match="mynode" xmlns:ext="http://www.mydomain.com/mynamespace">
   <xsl:value-of select="ext:GetStringLength('MyString')"/>
</template>

Requirements

Namespace: System.Xml.Xsl
Assembly: System.Xml (in System.Xml.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0