C#编程-141：读取注册表（遍历

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;
namespace RegistryTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            RegistryKey hklm = Registry.LocalMachine;
            RegistryKey software = hklm.OpenSubKey("Software");//不区分大小写
            RegistryKey microsoft = software.OpenSubKey("Microsoft");
            RegistryKey widows = microsoft.OpenSubKey("Windows");
            listBox1.Items.Clear();
            foreach (string site in widows.GetSubKeyNames())
            {
                if (site == "CurrentVersion")
                {
                    RegistryKey sitekey = widows.OpenSubKey(site);
                    foreach (string valName in sitekey.GetValueNames())
                    {
                        listBox1.Items.Add(valName + " : " + sitekey.GetValue(valName));
                    }
                    if(listBox1.Items.Count==0)
                        MessageBox.Show("未找到相关数据");
                    else
                        MessageBox.Show("读取完成！");
                }
            }
        }
    }
}