Question

我想使用filesystemwatcher监视多个文件夹，如下所示。我的下面的代码只看一个文件夹：

public static void Run()
{
     string[] args = System.Environment.GetCommandLineArgs();

     if (args.Length < 2)
     {
          Console.WriteLine("Usage: Watcher.exe PATH [...] [PATH]");
          return;
     }
     List<string> list = new List<string>();
     for (int i = 1; i < args.Length; i++)
     {
          list.Add(args[i]);
     }

     foreach (string my_path in list)
     {
          WatchFile(my_path);
     }

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

private static void WatchFile(string watch_folder)
{
    watcher.Path = watch_folder;

    watcher.NotifyFilter = NotifyFilters.LastWrite;
    watcher.Filter = "*.xml";
    watcher.Changed += new FileSystemEventHandler(convert);
    watcher.EnableRaisingEvents = true;
}

但是上面的代码监视一个文件夹并且对另一个文件夹没有影响。这是什么原因？

Answer 1

单个FileSystemWatcher只能监控单个文件夹。您需要多个 FileSystemWatchers才能实现此目的。

private static void WatchFile(string watch_folder)
{
    // Create a new watcher for every folder you want to monitor.
    FileSystemWatcher fsw = new FileSystemWatcher(watch_folder, "*.xml");

    fsw.NotifyFilter = NotifyFilters.LastWrite;

    fsw.Changed += new FileSystemEventHandler(convert);
    fsw.EnableRaisingEvents = true;
}

请注意，如果您想稍后修改这些观察者，您可能希望通过将其添加到列表或其他内容来维护对每个已创建的FileSystemWatcher的引用。

Answer 2

EnableRaisingEvents是默认false，您可以尝试将其放在更改之前，并为每个文件夹创建一个新的观察程序：

FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Path = watch_folder;
watcher.NotifyFilter = NotifyFilters.LastWrite;
watcher.Filter = "*.xml";
watcher.EnableRaisingEvents = true;
watcher.Changed += new FileSystemEventHandler(convert);

Filesystem Watcher - 多个文件夹

2 个答案: