问如何在C#中编写文件系统监视器？

EN

FileSystemWatcher watcher = new FileSystemWatcher();

watcher.Path = @"Z:\";
watcher.EnableRaisingEvents = true;
watcher.NotifyFilter = NotifyFilters.LastAccess;

watcher.Filter = "*.wsx";
watcher.Changed += new FileSystemEventHandler(OnChanged);

Console.WriteLine("Press \'q\' to quit the sample.");
while (Console.Read() != 'q') ;

public static string CrL = "\r\n";

private static void OnChanged(object source, FileSystemEventArgs e)
{
    string FileName;
    FileName = e.FullPath;

    Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
    Console.WriteLine("FILE is changed 1");
    SerialPort port = new SerialPort("COM1");

    port.Encoding = Encoding.ASCII;
    port.Open();

    using (System.IO.TextReader reader = System.IO.File.OpenText(e.FullPath))
    {
        string line;
        while ((line = reader.ReadLine()) != null)
        {
            port.Write(line);
            port.Write(CrL);
        }
    }

    port.Close();

    Console.WriteLine("FILE is sent to com port");
}