c# 监听文件夹动作

static FileSystemWatcher watcher = new FileSystemWatcher();
        /// <summary>       
        /// 初始化监听       
        /// </summary>       
        /// <param name="StrWarcherPath">需要监听的目录</param>       
        /// <param name="FilterType">需要监听的文件类型(筛选器字符串)</param>       
        /// <param name="IsEnableRaising">是否启用监听</param>       
        /// <param name="IsInclude">是否监听子目录</param>        
        private static void WatcherStrat(string StrWarcherPath, string FilterType, bool IsEnableRaising, bool IsInclude)
        {
            //初始化监听           
            watcher.BeginInit();
            //设置监听文件类型           
            watcher.Filter = FilterType;
            //设置是否监听子目录           
            watcher.IncludeSubdirectories = IsInclude;
            //设置是否启用监听?           
            watcher.EnableRaisingEvents = IsEnableRaising;
            //设置需要监听的更改类型(如:文件或者文件夹的属性,文件或者文件夹的创建时间;NotifyFilters枚举的内容)          
            watcher.NotifyFilter = NotifyFilters.Attributes | NotifyFilters.CreationTime | NotifyFilters.DirectoryName | NotifyFilters.FileName | NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.Security | NotifyFilters.Size;
            //设置监听的路径           
            watcher.Path = StrWarcherPath;
            //注册创建文件或目录时的监听事件           
            watcher.Created += new FileSystemEventHandler(watch_created);
            //注册当指定目录的文件或者目录发生改变的时候的监听事件  
            watcher.Changed += new FileSystemEventHandler(watch_changed);
            //注册当删除目录的文件或者目录的时候的监听事件           
            watcher.Deleted += new FileSystemEventHandler(watch_deleted);
            //当指定目录的文件或者目录发生重命名的时候的监听事件           
            watcher.Renamed += new RenamedEventHandler(watch_renamed);
            //结束初始化           
            watcher.EndInit();
        }

        /// <summary>       
        /// 创建文件或者目录时的监听事件      
        /// </summary>      
        /// <param name="sender"></param>       
        /// <param name="e"></param>       
        private static void watch_created(object sender, FileSystemEventArgs e)
        {
            //事件内容
            string fileName = e.FullPath;
            if (!System.IO.Path.GetExtension(fileName).Equals(".mp3", StringComparison.CurrentCultureIgnoreCase))
            {
                string targetFileName = e.FullPath.Substring(0, e.FullPath.LastIndexOf(".")) + ".mp3";
                WavConvertAmr.ConvertToMP3 toamr = new WavConvertAmr.ConvertToMP3();
                toamr.ConvertToAmr(System.Windows.Forms.Application.StartupPath, fileName, targetFileName);
            }
        }
        /// <summary>       
        /// 当指定目录的文件或者目录发生改变的时候的监听事件      
        /// </summary>       
        /// <param name="sender"></param>       
        /// <param name="e"></param>       
        private static void watch_changed(object sender, FileSystemEventArgs e)
        {
            //事件内容    
            //MessageBox.Show("发生改变");
        }
        /// <summary>       
        /// 当删除目录的文件或者目录的时候的监听事件       
        /// </summary>       
        /// <param name="sender"></param>             
        /// <param name="e"></param>      
        private static void watch_deleted(object sender, FileSystemEventArgs e)
        {
            //事件内容
        }
        /// <summary>       
        /// 当指定目录的文件或者目录发生重命名的时候的事件      
        /// </summary>      
        /// <param name="sender"></param>       
        /// <param name="e"></param>       
        private static void watch_renamed(object sender, RenamedEventArgs e)
        {
            //事件内容      
        }