XsltArgumentList.AddParam(String, String, Object) Method


Adds a parameter to the XsltArgumentList and associates it with the namespace qualified name.

 void AddParam(System::String ^ name, System::String ^ namespaceUri, System::Object ^ parameter);
public void AddParam (string name, string namespaceUri, object parameter);
member this.AddParam : string * string * obj -> unit
Public Sub AddParam (name As String, namespaceUri As String, parameter As Object)



The name to associate with the parameter.


The namespace URI to associate with the parameter. To use the default namespace, specify an empty string.


The parameter value or object to add to the list.


The namespaceUri is either null or http://www.w3.org/1999/XSL/Transform.

The name is not a valid name according to the W3C XML specification.

The namespaceUri already has a parameter associated with it.


The following example uses the AddParam method to create a parameter representing the current date and time.

using System;
using System.IO;
using System.Xml;
using System.Xml.Xsl;

public class Sample

    public static void Main()

        // Create the XslCompiledTransform and load the stylesheet.
        XslCompiledTransform xslt = new XslCompiledTransform();

        // Create the XsltArgumentList.
        XsltArgumentList xslArg = new XsltArgumentList();

        // Create a parameter which represents the current date and time.
        DateTime d = DateTime.Now;
        xslArg.AddParam("date", "", d.ToString());

        // Transform the file.
        using (XmlWriter w = XmlWriter.Create("output.xml"))
            xslt.Transform("order.xml", xslArg, w);
Imports System.IO
Imports System.Xml
Imports System.Xml.Xsl

Public Class Sample

    Public Shared Sub Main()

        ' Create the XslCompiledTransform and load the stylesheet.
        Dim xslt As New XslCompiledTransform()

        ' Create the XsltArgumentList.
        Dim xslArg As New XsltArgumentList()

        ' Create a parameter which represents the current date and time.
        Dim d As DateTime = DateTime.Now
        xslArg.AddParam("date", "", d.ToString())

        Using w As XmlWriter = XmlWriter.Create("output.xml")
            ' Transform the file.
            xslt.Transform("order.xml", xslArg, w)
        End Using

    End Sub
End Class

The example uses the following two data files as input.


<!--Represents a customer order-->
  <book ISBN='10-861003-324'>
    <title>The Handmaid's Tale</title>
  <cd ISBN='2-3631-4'>


<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:param name="date"/>
  <xsl:template match="/">
      <date><xsl:value-of select="$date"/></date>
      <total><xsl:value-of select="sum(//price)"/></total>


The parameter should correspond to a W3C type. The following table shows the W3C types, either XPath or XSLT, and the corresponding.NET class.

W3C Type Equivalent.NET Class (Type)
String (XPath) String
Boolean (XPath) Boolean
Number (XPath) Double
Result Tree Fragment (XSLT) XPathNavigator
Node Set (XPath) XPathNodeIterator

Node* (XPath) XPathNavigator

*This is equivalent to a node set that contains a single node.

If the parameter object being invoked from within the style sheet is not one of the above, it is converted according to the following rules:

All other types throw an error.

Applies to

See also