public static void Init()
        {//文件监控
            string filePath = "app.config";
            System.Configuration.Configuration applicationConfiguration = ConfigurationManager.OpenExeConfiguration("");
            filePath = Path.Combine(Path.GetDirectoryName(applicationConfiguration.FilePath), filePath);
            FileSystemWatcher watcher = new FileSystemWatcher();
            watcher.Path = filePath.Substring(0, filePath.LastIndexOf("\\"));
            watcher.Filter = "app.config";
            watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName;
            watcher.Changed += new FileSystemEventHandler(FileChanged);
                        watcher.EnableRaisingEvents = true;
        }
        private static void FileChanged(object Sender, FileSystemEventArgs e)
        {
            //do something
        }