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XPathXSLSample2.cs：源码内容
							using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.IO;
using System.Data;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Xsl;
namespace Wrox.ProCSharp.Xml.XPathXSLSample2
{
	/// <summary>
	///		Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.ListBox listBox1;
		private System.Windows.Forms.Button button1;
		/// <summary>
		///		Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components=null;
		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();
			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}
		/// <summary>
		///		Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
				{
					if( disposing )
					{
						if (components != null) 
						{
							components.Dispose();
						}
					}
					base.Dispose( disposing );
				}
		#region Windows Form Designer generated code
		/// <summary>
		///		Required method for Designer support - do not modify
		///		the contents of this method with the code editor.
		/// </summary>
    private void InitializeComponent()
    {
      this.listBox1 = new System.Windows.Forms.ListBox();
      this.button1 = new System.Windows.Forms.Button();
      this.SuspendLayout();
      // 
      // listBox1
      // 
      this.listBox1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
        | System.Windows.Forms.AnchorStyles.Right)));
      this.listBox1.Location = new System.Drawing.Point(24, 16);
      this.listBox1.Name = "listBox1";
      this.listBox1.Size = new System.Drawing.Size(232, 225);
      this.listBox1.TabIndex = 0;
      // 
      // button1
      // 
      this.button1.Anchor = System.Windows.Forms.AnchorStyles.Bottom;
      this.button1.Location = new System.Drawing.Point(40, 256);
      this.button1.Name = "button1";
      this.button1.Size = new System.Drawing.Size(200, 24);
      this.button1.TabIndex = 1;
      this.button1.Text = "Load XML";
      this.button1.Click += new System.EventHandler(this.button1_Click);
      // 
      // Form1
      // 
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(288, 293);
      this.Controls.Add(this.button1);
      this.Controls.Add(this.listBox1);
      this.Name = "Form1";
      this.Text = "Form1";
      this.ResumeLayout(false);
    }
		#endregion
		/// <summary>
		/// 	The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main()
		{
			Application.Run(new Form1());
		}
    // XPathXSLSample2/form1.cs
    private void button1_Click(object sender, System.EventArgs e) {
      //modify to match your path structure
      XPathDocument doc=new XPathDocument("..\..\..\booksxpath.xml");
      //create the XPath navigator
      XPathNavigator nav=((IXPathNavigable)doc).CreateNavigator();
      //create the XPathNodeIterator of book nodes
      // that have genre attribute value of novel
      XPathNodeIterator iter=nav.Select("/bookstore/book[@genre='novel']");
      
      while(iter.MoveNext()) {
        LoadBook(iter.Current.Clone());
      }
      //add a break line and calculate the sum
      listBox1.Items.Add("========================");
      listBox1.Items.Add("Total Cost = " + nav.Evaluate("sum(/bookstore/book[@genre='novel']/price)"));
    }
    
    private void LoadBook(XPathNavigator lstNav) {
      //We are passsed an XPathNavigator of a particular book node
      //we will select all of the direct descendents and
      //load the list box with the names and values
      XPathNodeIterator iterBook=lstNav.SelectDescendants(XPathNodeType.Element,false);
      while(iterBook.MoveNext())
        listBox1.Items.Add(iterBook.Current.Name + ": " + iterBook.Current.Value);
    }
 
	}
}

						