xml文件： <?xml version="1.0" encoding="utf-8" ?><circles>  <circle>    <radius>15</radius>  </circle>  <circle>    <radius>18</radius>  </circle></circles> xslt 文件 <?xml version="1.0" encoding="UTF-8" ?><xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:myns="urn:myobject">  <xsl:template match="circles/circle">    <xsl:copy>      <xsl:apply-templates/>    </xsl:copy>  </xsl:template>  <xsl:template match="radius">    <circumference>      <xsl:value-of select="myns:getcircumference(.)"/>    </circumference>  </xsl:template></xsl:stylesheet> 主程序 using System;using System.Collections.Generic;using System.Text;using System.Xml;using System.Xml.XPath;using System.Xml.Xsl; namespace extensionobject{    class Program    {        private static string inputfile = @"E:\c#\c#_windows程序设计\extensionobject\extensionobject\circles.xml";        private static string stylefile = @"E:\c#\c#_windows程序设计\extensionobject\extensionobject\circles.xslt";        private static string resultfile = @"E:\c#\c#_windows程序设计\extensionobject\extensionobject\result.xml";         static void Main(string[] args)        {            calculate mycalculate = new calculate();                        XsltArgumentList arglist = new XsltArgumentList();            arglist.AddExtensionObject("urn:myobject", mycalculate); //前一参数指定命名空间             XslCompiledTransform transformer = new XslCompiledTransform();            transformer.Load(stylefile);            XPathDocument inputdoc = new XPathDocument(inputfile);             XmlTextWriter xtw = new XmlTextWriter(resultfile, null);            transformer.Transform(inputdoc, arglist, xtw);            xtw.Close();         }    }     public class calculate    {        public double getcircumference(double radius)        {            return Math.PI * 2 * radius;        }    }}

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