XsltArgumentList.AddExtensionObject 方法

将新对象添至 XsltArgumentList 并将其与命名空间 URI 关联。

命名空间:System.Xml.Xsl 程序集:System.Xml（在 system.xml.dll 中）

 语法

Visual Basic（声明）

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

Visual Basic（用法）

Dim instance As XsltArgumentList
Dim namespaceUri As String
Dim extension As Object

instance.AddExtensionObject(namespaceUri, extension)

C#

public void AddExtensionObject (
    string namespaceUri,
    Object extension
)

C++

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

J#

public void AddExtensionObject (
    String namespaceUri, 
    Object extension
)

JScript

public function AddExtensionObject (
    namespaceUri : String, 
    extension : Object
)

 

参数

namespaceUri

要与对象关联的命名空间 URI。若要使用默认命名空间，请指定空字符串。

extension

要添至列表的对象。

 异常

异常类型	条件
ArgumentException	namespaceUri 是 空引用（在 Visual Basic 中为 Nothing） 或 http://www.w3.org/1999/XSL/Transform namespaceUri 已经具有与其关联的扩展对象。
SecurityException	调用方没有足够的权限调用此方法。

 备注

params 关键字，它允许传递未指定数量的参数，当前不允许此操作。使用以 params 关键字定义的方法的 XSLT 样式表将不会正确工作。有关更多信息，请参见 params（C# 参考）。

给调用者的说明 调用此方法需要 FullTrust。有关更多信息，请参见 代码访问安全性。

 示例

在下面的示例中，样式表使用 XSLT 扩展对象来转换书价。

Visual Basic

复制代码

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")
        
        ' Load the XML data file.
        Dim doc As New XPathDocument("books.xml")
        
        ' 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)
        
        ' Transform the file.
        xslt.Transform("books.xml", xslArg, XmlWriter.Create("output.xml"))
    
    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

C#

复制代码

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");

    // Load the XML data file.
    XPathDocument doc = new XPathDocument("books.xml");

    // 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);

    // Transform the file.
    xslt.Transform("books.xml", xslArg, XmlWriter.Create("output.xml"));

  }

  // 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;
    }
  }
}

C++

复制代码

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Xml::XPath;
using namespace System::Xml::Xsl;

// Convert the book price to a new price using the conversion factor.
public ref class BookPrice
{
private:
   Decimal newprice;

public:
   BookPrice()
   {
      newprice = 0;
   }

   Decimal NewPriceFunc( Decimal price, Decimal conv )
   {
      Decimal tmp = price * conv;
      newprice = Decimal::Round( tmp, 2 );
      return newprice;
   }

};

public ref class Sample
{

public:
   Sample()
   {
      
      // Create the XslCompiledTransform and load the stylesheet.
      XslCompiledTransform^ xslt = gcnew XslCompiledTransform;
      xslt->Load( "prices.xsl" );
      
      // Load the XML data file.
      XPathDocument^ doc = gcnew XPathDocument( "books.xml" );
      
      // Create an XsltArgumentList.
      XsltArgumentList^ xslArg = gcnew XsltArgumentList;
      
      // Add an object to convert the book price.
      BookPrice^ obj = gcnew BookPrice;
      xslArg->AddExtensionObject( "urn:price-conv", obj );
            
      // Transform the file.
      xslt->Transform(doc, xslArg, XmlWriter::Create("output.xml"));

   }

};

int main()
{
   Sample^ test = gcnew Sample;
}

J#

复制代码

import System.*;
import System.IO.*;
import System.Xml.*;
import System.Xml.XPath.*;
import System.Xml.Xsl.*;

public class Sample
{

    public static void main(String[] args)
    {
        Sample test = new Sample();
    } //main

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

        // Load the XML data file.
        XPathDocument doc = new XPathDocument("books.xml");

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

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

        // Transform the file.
        xslt.Transform("books.xml", xslArg, XmlWriter.Create("output.xml"));
        
    } // Sample

    // Convert the book price to a new price using the conversion factor.
    public class BookPrice
    {
        private System.Decimal newprice = System.Convert.ToDecimal(0);

        public System.Decimal NewPriceFunc(System.Decimal price,
            System.Decimal conv)
        {
            System.Decimal tmp = Decimal.Multiply(price, conv);
            newprice = System.Decimal.Round(tmp, 2);
            return newprice;
        } //NewPriceFunc
    } //BookPrice
} //Sample

该示例将下列数据文件用作输入。

books.xml

复制代码

<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

复制代码

<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>