XsltArgumentList.AddExtensionObject(String, Object) Metode

Definisi

Ruang nama:

System.Xml.Xsl

Rakitan:

netstandard.dll, System.Xml.ReaderWriter.dll

Sumber:

XsltArgumentList.cs

Menambahkan objek baru ke XsltArgumentList dan mengaitkannya dengan URI namespace.

public:
 void AddExtensionObject(System::String ^ namespaceUri, System::Object ^ extension);

[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("The stylesheet may have calls to methods of the extension object passed in which cannot be statically analyzed by the trimmer. Ensure all methods that may be called are preserved.")]
public void AddExtensionObject(string namespaceUri, object extension);

[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("The stylesheet may have calls to methods of the extension object passed in which cannot be statically analyzed by the trimmer. Ensure all methods that may be called are preserved.")>]
member this.AddExtensionObject : string * obj -> unit

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

Parameter

namespaceUri

String

URI namespace untuk dikaitkan dengan objek. Untuk menggunakan namespace default, tentukan string kosong.

extension

Object

Objek yang akan ditambahkan ke daftar.

Atribut

RequiresUnreferencedCodeAttribute

Pengecualian

ArgumentException

namespaceUri adalah atau nullhttp://www.w3.org/1999/XSL/Transform

sudah namespaceUri memiliki objek ekstensi yang terkait dengannya.

SecurityException

Pemanggil tidak memiliki izin yang memadai untuk memanggil metode ini.

Contoh

Dalam contoh berikut, lembar gaya menggunakan objek ekstensi XSLT untuk mengonversi harga buku.

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

public class Sample {

   public static void Main() {

    // Create the XslCompiledTransform and load the stylesheet.
    XslCompiledTransform xslt = new XslCompiledTransform();
    xslt.Load("prices.xsl");

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

    // Add an object to calculate the new book price.
    BookPrice obj = new BookPrice();
    xslArg.AddExtensionObject("urn:price-conv", obj);

    using (XmlWriter w = XmlWriter.Create("output.xml"))
    {
        // Transform the file.
        xslt.Transform("books.xml", xslArg, w);
    }
  }

  // Convert the book price to a new price using the conversion factor.
  public class BookPrice{

    private decimal newprice = 0;
        
    public decimal NewPriceFunc(decimal price, decimal conv){
       decimal tmp = price*conv;
       newprice = decimal.Round(tmp, 2);
       return newprice;
    }
  }
}

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
    
    ' 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

End Class

Contohnya menggunakan file data berikut sebagai 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>

Keterangan

Kata params kunci, yang memungkinkan jumlah parameter yang tidak ditentukan untuk diteruskan, saat ini tidak didukung. Lembar gaya XSLT yang menggunakan metode yang ditentukan dengan params kata kunci tidak berfungsi dengan benar. Untuk informasi selengkapnya, lihat param.

Lihat juga

• Objek Ekstensi XSLT
• Parameter XSLT
• Menggunakan Kelas XslCompiledTransform