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 XsltArgumentListDim namespaceUri As StringDim extension As Objectinstance.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 SystemImports System.IOImports System.XmlImports System.Xml.XPathImports System.Xml.XslPublic 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 'BookPriceEnd Class 'Sample

C#

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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#

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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

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<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

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<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>