c# - 尽管采取了措施，FileSystemWatcher 事件仍会引发两次

Question

我在这里和其他网站上浏览了很多主题以寻找解决此问题的方法。

这是我的 FileMonitor 类:

class FileMonitor
{
    public FileMonitor(String path)
    {
        try
        {
            var watcher = new FileSystemWatcher()
            {
                Path = path,
                IncludeSubdirectories = true,
                InternalBufferSize = 65536,
                EnableRaisingEvents = true
            };

            watcher.Changed += new FileSystemEventHandler(OnFileChanged);
            watcher.Created += new FileSystemEventHandler(OnFileCreated);
            watcher.Deleted += new FileSystemEventHandler(OnFileDeleted);
            watcher.Renamed += new RenamedEventHandler(OnFileRenamed);
            watcher.Error += new ErrorEventHandler(OnWatcherError);
        }
        catch (Exception)
        {

            throw;
        }
    }

    private void OnWatcherError(object sender, ErrorEventArgs e)
    {

    }

    private void OnFileChanged(object sender, FileSystemEventArgs e)
    {
        try
        {
            ((FileSystemWatcher)sender).EnableRaisingEvents = false;

            LogFileSystemChanges(e);
        }

        finally
        {
            ((FileSystemWatcher)sender).EnableRaisingEvents = true;
        }
    }

    private void OnFileCreated(object sender, FileSystemEventArgs e)
    {
        try
        {
            ((FileSystemWatcher)sender).EnableRaisingEvents = false;

            LogFileSystemChanges(e);
        }

        finally
        {
            ((FileSystemWatcher)sender).EnableRaisingEvents = true;
        }
    }

    private void OnFileDeleted(object sender, FileSystemEventArgs e)
    {
        try
        {
            ((FileSystemWatcher)sender).EnableRaisingEvents = false;

            LogFileSystemChanges(e);
        }

        finally
        {
            ((FileSystemWatcher)sender).EnableRaisingEvents = true;
        }
    }

    private void OnFileRenamed(object sender, RenamedEventArgs e)
    {
        try
        {
            ((FileSystemWatcher)sender).EnableRaisingEvents = false;

            LogFileSystemRenaming(e);
        }

        finally
        {
            ((FileSystemWatcher)sender).EnableRaisingEvents = true;
        }
    }

    private void LogFileSystemChanges(FileSystemEventArgs e)
    {
        string log = string.Format("{0:G}: {1} | {2}", DateTime.Now, e.FullPath, e.ChangeType);
        Console.WriteLine(log);
    }

    private void LogFileSystemRenaming(RenamedEventArgs e)
    {
        string log = string.Format("{0:G}: {1} | Old name: {2}", DateTime.Now, e.FullPath, e.OldName);
        Console.WriteLine(log);
    }
}

如您所知，我已经尝试了 ((FileSystemWatcher)sender).EnableRaisingEvents = false; 的“锁定”，但我可以从控制台输出中得知我的事件触发了两次。

对此有什么想法吗？我真的不确定从这里到哪里去。

Answer 1

我遇到了同样的问题，经过一番折腾后得出的结论是，记事本 将一个文件连续写入了三次 (!)。如果一个应用程序真的经常保存那么多(也许是三角备份等)，那么您无能为力。

我还注意到您已附加到所有事件，您应该将其缩小到您需要的最低限度，并使用 NotifyFilters 过滤掉您不感兴趣的那些.