C#编程

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DOMSample2.cs：源码内容
							using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Xml;
namespace Wrox.ProCSharp.Xml.DOMSample2
{
  
	/// <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;
    private XmlDocument doc=new XmlDocument();
    
		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.listBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
        | System.Windows.Forms.AnchorStyles.Right);
      this.listBox1.Size = new System.Drawing.Size(336, 238);
      this.listBox1.TabIndex = 0;
      this.listBox1.SelectedIndexChanged += new System.EventHandler(this.listBox1_SelectedIndexChanged);
      this.button1.Anchor = System.Windows.Forms.AnchorStyles.Bottom;
      this.button1.Location = new System.Drawing.Point(136, 264);
      this.button1.TabIndex = 1;
      this.button1.Text = "Load XML";
      this.button1.Click += new System.EventHandler(this.button1_Click);
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(339, 320);
      this.Controls.AddRange(new System.Windows.Forms.Control[] {this.button1,
                                                                  this.listBox1});
      this.Text = "Form1";
    }
		#endregion
		/// <summary>
		/// 	The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
    // DOMSample2/form1.cs
    private void button1_Click(object sender, System.EventArgs e) {
      //doc is declared at the module level
      //change path to math your path structure
      doc.Load("..\..\..\books.xml");
      //get onley the nodes that we want.
      XmlNodeList nodeLst=doc.SelectNodes("/bookstore/book/title");
      //iterate through the XmlNodeList
      foreach(XmlNode node in nodeLst)
        listBox1.Items.Add(node.InnerText);
    }
    private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
    {
      //create XPath search string
      string srch="bookstore/book[title='" + listBox1.SelectedItem.ToString() + "']";
      //look for the extra data
      XmlNode foundNode=doc.SelectSingleNode(srch);
      if(foundNode!=null)
        MessageBox.Show(foundNode.InnerText);
      else
        MessageBox.Show("Not found");
      
    }
	}
}

						