如何实现文件和文件夹的监控功能

using System;
using System.IO;

namespace Test
{
    class UseFileSystemWatcher
    {
        //退出程序命令
        private const string Exit = "exit";
        //监视的文件夹
        private const string Folder = @"D:\Test";

        private FileSystemWatcher _fsw;

        public UseFileSystemWatcher()
        {
            _fsw = new FileSystemWatcher();
            //建立监测文件夹
            if (Directory.Exists(Folder))
            {
                Directory.Delete(Folder, true);
            }
            Directory.CreateDirectory(Folder);
            _fsw.Path = Folder;
            //这里选择最后访问文件时间、最后写文件时间、文件名、
            //文件夹名变化时，触发事件
            _fsw.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;
            //这里选择监测所有的zip文件
            _fsw.Filter = "*.rar";
            //为这些事件添加处理方法。
            _fsw.Changed+=new FileSystemEventHandler(OnChanged);
            _fsw.Created+=new FileSystemEventHandler(OnChanged);
            _fsw.Deleted+=new FileSystemEventHandler(OnChanged);
            _fsw.Renamed += new RenamedEventHandler(OnRenamed);
            //这里开始所有事件会被触发
            _fsw.EnableRaisingEvents = true;

        }
        //处理变化事件，变化可以包含创建、修改和删除
        private void OnChanged(object source, FileSystemEventArgs e)
        {
            Console.WriteLine("文件：{0}{1}", e.FullPath, e.ChangeType.ToString());
        }
        //处理重命名事件
        private static void OnRenamed(object source, RenamedEventArgs e)
        {
            Console.WriteLine("文件：{0}重命名为：{1}",e.OldFullPath,e.FullPath);
        }

        static void Main()
        {
            try
            {
                UseFileSystemWatcher ws = new UseFileSystemWatcher();
                while (Console.ReadLine()!=Exit)
                {

                }
            }
            finally
            { 
                //清理测试数据
                if (Directory.Exists(Folder))
                {
                    Directory.Delete(Folder, true);
                }
            }
        }
    }
}