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XslTransform.Transform Method (IXPathNavigable, XsltArgumentList, XmlWriter)

Transforms the XML data in the IXPathNavigable using the specified args and outputs the result to an XmlWriter.

Namespace:  System.Xml.Xsl
Assembly:  System.Xml (in System.Xml.dll)

public void Transform(
	IXPathNavigable input,
	XsltArgumentList args,
	XmlWriter output


Type: System.Xml.XPath.IXPathNavigable
An object implementing the IXPathNavigable interface. In the .NET Framework, this can be either an XmlNode (typically an XmlDocument), or an XPathDocument containing the data to be transformed.
Type: System.Xml.Xsl.XsltArgumentList
An XsltArgumentList containing the namespace-qualified arguments used as input to the transformation.
Type: System.Xml.XmlWriter
The XmlWriter to which you want to output.


There was an error processing the XSLT transformation.

Note: This is a change in behavior from earlier versions. An XsltException is thrown if you are using Microsoft .NET Framework version 1.1 or earlier.


The XslTransform class is obsolete in the .NET Framework version 2.0. The XslCompiledTransform class is the new XSLT processor. For more information, see Using the XslCompiledTransform Class and Migrating From the XslTransform Class.

XslTransform supports the XSLT 1.0 syntax. The XSLT style sheet must include the namespace declaration xmlns:xsl=


This method is now obsolete. The setting of the XmlResolver property determines how the XSLT document() function is resolved. The recommended practice is to use the Transform method which takes an XmlResolver object as one of its arguments.

The args are matched with the xsl:param elements defined in the style sheet. The xsl:output element is not supported when outputting to an XmlWriter (xsl:output is ignored). See Outputs from an XslTransform for more information.

Transformations apply to the document as a whole. In other words, if you pass in a node other than the document root node, this does not prevent the transformation process from accessing all nodes in the loaded document. To transform a node fragment, you must create an XmlDocument containing just the node fragment and pass that XmlDocument to the Transform method.

The following example performs a transformation on a node fragment.

 XslTransform xslt = new XslTransform();     
 XmlDocument doc = new XmlDocument();
 // Create a new document containing just the node fragment.
 XmlNode testNode = doc.DocumentElement.FirstChild; 
 XmlDocument tmpDoc = new XmlDocument(); 
 // Pass the document containing the node fragment 
 // to the Transform method.
 Console.WriteLine("Passing " + tmpDoc.OuterXml + " to print_root.xsl");
 xslt.Transform(tmpDoc, null, Console.Out);

The example uses the library.xml and print_root.xsl files as input and outputs the following to the console.

 Passing <book genre="novel" ISBN="1-861001-57-5"><title>Pride And Prejudice</title></book> to print_root.xsl 
 Root node is book.


   <book genre='novel' ISBN='1-861001-57-5'>
      <title>Pride And Prejudice</title>
   <book genre='novel' ISBN='1-81920-21-2'>


 <style sheet version="1.0" xmlns="" >
   <output method="text" />
   <template match="/">
   Root node is  <value-of select="local-name(//*[position() = 1])" /> 
 </style sheet>

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.0
Obsolete (compiler warning) in 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.