Timer用法（监控目录结构变动）

using System;
using System.IO ;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Threading;
using log4net;

namespace DirectoryMonitor
{
    /// <summary>
    ///   监控文件目录变化
    ///   使用<see cref="FileSystemWatcher"/>进行文件监控，可能同时产生多个事件
    ///   采用一个定时器可以将多个事件提示转换成一个单一事件，定时器需要等待
    ///   <see cref="TimeoutMillis"/>后才会触发下一个事件提示
    /// </summary>
    public sealed class MonitorFS
    {
        #region "Private Method"
        private static readonly ILog Log = LogManager.GetLogger(typeof(MonitorFS));
        private Timer m_timer;
        private const int TimeoutMillis = 1000;
        private string strPath;
        private string strCmd;

        #endregion

        /// <summary>
        ///  启动监控
        /// </summary>
        /// <param name="path"></param>
        /// <param name="cmd"></param>
        internal static void StartWatching(string path, string cmd)
        {
            new MonitorFS(path, cmd);
        }

        /// <summary>
        ///  构造函数
        /// </summary>
        /// <param name="path">要监视的文件夹</param>
        /// <param name="cmd">要执行的命令</param>
        private MonitorFS(string path, string cmd)
        {
            strPath = path;
            strCmd = cmd;
            FileSystemWatcher watcher = new FileSystemWatcher(path);

            // 注册文件及文件夹创建、删除、重命名事件
            watcher.Created += new FileSystemEventHandler(watcher_Created);
            watcher.Deleted += new FileSystemEventHandler(watcher_Deleted);
            watcher.Renamed += new RenamedEventHandler(watcher_Renamed);

            watcher.Filter = "*.*";          
            watcher.IncludeSubdirectories = true;

            //开始监视
            watcher.EnableRaisingEvents = true;

            m_timer = new Timer(new TimerCallback(OnWatchedChange), null, Timeout.Infinite, Timeout.Infinite);

        }

       
        /// <summary>
        ///  文件或路径创建
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void watcher_Created(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine(DateTime .Now .ToString () + " File Created");

            m_timer.Change(TimeoutMillis, Timeout.Infinite);
        }

        /// <summary>
        ///  文件或文件路径删除时
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void watcher_Deleted(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine(DateTime.Now.ToString() +  " File Delete");
            m_timer.Change(TimeoutMillis, Timeout.Infinite);
        }

        /// <summary>
        ///  文件或文件路径改名时
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void watcher_Renamed(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine(DateTime.Now.ToString() +  " File Change");
            m_timer.Change(TimeoutMillis, Timeout.Infinite);
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="state"></param>
        private void OnWatchedChange(object state)
        {
            Execute();
        }

        /// <summary>
        ///
        /// </summary>
        private void Execute()
        {         
            
            if (string.IsNullOrEmpty (strCmd ))
                return ;
            try
            {               
                ProcessStartInfo startinfo = new ProcessStartInfo();
                startinfo.FileName = strCmd;
                startinfo.UseShellExecute = false;
                startinfo.CreateNoWindow = true;
                startinfo.RedirectStandardOutput = true;

                Process myProcess = new Process();
                myProcess.StartInfo = startinfo;

                myProcess.Start();
                StreamReader sr = myProcess.StandardOutput;
                string info = sr.ReadToEnd();
               
                Log.Info(info);
               
            }
            catch (Exception ex)
            {              
                Log.Error("Execute " + strCmd,ex );              
            }
            finally
            {
                 Log.Info("\r\n==========================================\r\n");
            }
        }

      
    }
}