做了一个FileSystemWatcher的实验，发现没有起到作用，求教！

Question

你可以检查一下缺少什么属性，特别是fw开始监视，需要开启相应的RaiseXXXX开关。

Answer 1

fw.EnableRaisingEvents = true;

Answer 2

fw.EnableRaisingEvents = true;

Answer 3

        [PermissionSet(SecurityAction.LinkDemand, Name = "FullTrust")]
        static void Main(string[] args)
        {
            FileSystemWatcher watcher = new FileSystemWatcher();
            watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
               | NotifyFilters.FileName | NotifyFilters.DirectoryName;
            watcher.Filter = "*.*";
            watcher.Path = "D:\\test";
            watcher.Changed += new FileSystemEventHandler(OnChanged);
            watcher.Created += new FileSystemEventHandler(OnChanged);
            watcher.Deleted += new FileSystemEventHandler(OnChanged);
            watcher.Renamed += new RenamedEventHandler(OnRenamed);            watcher.EnableRaisingEvents = true;
            Console.WriteLine("Press \'q\' to quit the sample.");
            while (Console.Read() != 'q') ;
        }
        private static void OnChanged(object source, FileSystemEventArgs e)
        {
            Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
        }
        private static void OnRenamed(object source, RenamedEventArgs e)
        {
            Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);
        }