XsltArgumentList.AddExtensionObject Method (String, Object)

 

Adds a new object to the XsltArgumentList and associates it with the namespace URI.

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

Public Sub AddExtensionObject (
	namespaceUri As String,
	extension As Object
)

Parameters

namespaceUri
Type: System.String

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

extension
Type: System.Object

The object to add to the list.

Exception Condition
ArgumentException

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

The namespaceUri already has an extension object associated with it.

SecurityException

The caller does not have sufficient permissions to call this method.

The params keyword, which allows an unspecified number of parameters to be passed, is currently not supported. XSLT style sheets that utilize methods defined with the params keyword does not work correctly. For more information, see params (C# Reference).

In the following example, the style sheet uses an XSLT extension object to convert the book price.

Imports System
Imports System.IO
Imports System.Xml
Imports System.Xml.XPath
Imports System.Xml.Xsl

Public Class Sample

    Public Shared Sub Main() 

        ' Create the XslCompiledTransform and load the stylesheet.
        Dim xslt As New XslCompiledTransform()
        xslt.Load("prices.xsl")

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

        ' Add an object to calculate the new book price.
        Dim obj As New BookPrice()
        xslArg.AddExtensionObject("urn:price-conv", obj)


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



    End Sub 'Main 

    ' Convert the book price to a new price using the conversion factor.    
    Public Class BookPrice

        Private newprice As Decimal = 0

        Public Function NewPriceFunc(ByVal price As Decimal, ByVal conv As Decimal) As Decimal 
            Dim tmp As Decimal = price * conv
            newprice = Decimal.Round(tmp, 2)
            Return newprice        
        End Function 'NewPriceFunc

    End Class 'BookPrice

End Class 'Sample

The example uses the following data files as input.

books.xml

<bookstore>
  <book genre="autobiography" publicationdate="1981" ISBN="1-861003-11-0">
    <title>The Autobiography of Benjamin Franklin</title>
    <author>
      <first-name>Benjamin</first-name>
      <last-name>Franklin</last-name>
    </author>
    <price>8.99</price>
  </book>
  <book genre="novel" publicationdate="1967" ISBN="0-201-63361-2">
    <title>The Confidence Man</title>
    <author>
      <first-name>Herman</first-name>
      <last-name>Melville</last-name>
    </author>
    <price>11.99</price>
  </book>
  <book genre="philosophy" publicationdate="1991" ISBN="1-861001-57-6">
    <title>The Gorgias</title>
    <author>
      <name>Plato</name>
    </author>
    <price>9.99</price>
  </book>
</bookstore>

prices.xsl

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:myObj="urn:price-conv">

<!--Price conversion factor-->
<xsl:param name="conv" select="1.15"/>

  <xsl:template match="bookstore">
  <bookstore>
  <xsl:for-each select="book">
    <book>
    <xsl:copy-of select="node()"/>
       <new-price>
          <xsl:value-of select="myObj:NewPriceFunc(./price, $conv)"/>        
       </new-price>
    </book>
  </xsl:for-each>
  </bookstore>
  </xsl:template>
</xsl:stylesheet>

.NET Framework
Available since 1.1
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