//全局變量 

public static FileSystemWatcher Watcher;

       /// <summary>
        /// 設置監聽配置
        /// </summary>
        /// <returns>ture/false</returns>
        public static Boolean SetMonitorFile()
        {
            try
            {
                Watcher = new FileSystemWatcher();
                Watcher.Filter = "*.txt";
                Watcher.Path = "d://"; //路徑
                Watcher.NotifyFilter = NotifyFilters.Size; //文件大小改變
                //文件改變事件
                Watcher.Changed += new FileSystemEventHandler(Watcher_Changed); ;
                //文件創建事件       
                Watcher.Created += new FileSystemEventHandler(Watcher_Created);
                //文件刪除事件
                Watcher.Deleted += new FileSystemEventHandler(Watcher_Deleted);
                //文件重命名事件
                Watcher.Renamed += new RenamedEventHandler(Watcher_Renamed);
                //設置監聽子目錄
                Watcher.IncludeSubdirectories = false;
                //開始進行監聽（其實此處是標示是否進行事件監聽和拋出）
                Watcher.EnableRaisingEvents = true;
                //watcher.EndInit();
                return true;
            }
            catch (Exception ex)
            {
                return false;
            }

        }