我正在尝试使用FileSystemWatcher监视已移动的文件,并在此处获得了一些帮助:
Using FileSystemWatcher with multiple files
但是,我发现我必须能够同时使用Deleted和Created事件来获取文件移动的路径以及移动文件的路径。但是当我为Delete事件添加类似的代码时,我只能触发一个或另一个事件。它似乎是我连接事件的顺序,决定了哪个事件将运行。因此,如果我将Created事件放在接线代码的最后,那将会运行,反之亦然,如果我将删除布线放在最后,那将运行,但不会创建。
以下是代码:
public class FileListEventArgs : EventArgs
{
public List<string> FileList { get; set; }
}
public class Monitor
{
private List<string> filePaths;
private List<string> deletedFilePaths;
private ReaderWriterLockSlim rwlock;
private Timer processTimer;
private Timer deletionTimer;
public event EventHandler FileListCreated;
public event EventHandler FileListDeleted;
public void OnFileListCreated(FileListEventArgs e)
{
if (FileListCreated != null)
FileListCreated(this, e);
}
public void OnFileListDeleted(FileListEventArgs e)
{
if (FileListDeleted != null)
FileListDeleted(this, e);
}
public Monitor(string path)
{
filePaths = new List<string>();
deletedFilePaths = new List<string>();
rwlock = new ReaderWriterLockSlim();
FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Filter = "*.*";
watcher.Deleted += new FileSystemEventHandler(watcher_Deleted);
watcher.Created += watcher_FileCreated;
watcher.Path = path;
watcher.IncludeSubdirectories = true;
watcher.EnableRaisingEvents = true;
}
private void ProcessQueue()
{
try
{
Console.WriteLine("Processing queue, " + filePaths.Count + " files created:");
rwlock.EnterReadLock();
}
finally
{
if (processTimer != null)
{
processTimer.Stop();
processTimer.Dispose();
processTimer = null;
OnFileListCreated(new FileListEventArgs { FileList = filePaths });
filePaths.Clear();
}
rwlock.ExitReadLock();
}
}
private void ProcessDeletionQueue()
{
try
{
Console.WriteLine("Processing queue, " + deletedFilePaths.Count + " files created:");
rwlock.EnterReadLock();
}
finally
{
if (processTimer != null)
{
processTimer.Stop();
processTimer.Dispose();
processTimer = null;
OnFileListDeleted(new FileListEventArgs { FileList = deletedFilePaths });
deletedFilePaths.Clear();
}
rwlock.ExitReadLock();
}
}
void watcher_FileCreated(object sender, FileSystemEventArgs e)
{
try
{
rwlock.EnterWriteLock();
filePaths.Add(e.FullPath);
if (processTimer == null)
{
// First file, start timer.
processTimer = new Timer(2000);
processTimer.Elapsed += (o, ee) => ProcessQueue();
processTimer.Start();
}
else
{
// Subsequent file, reset timer.
processTimer.Stop();
processTimer.Start();
}
}
finally
{
rwlock.ExitWriteLock();
}
}
void watcher_Deleted(object sender, FileSystemEventArgs e)
{
try
{
rwlock.EnterWriteLock();
deletedFilePaths.Add(e.FullPath);
if (deletionTimer == null)
{
// First file, start timer.
deletionTimer = new Timer(2000);
deletionTimer.Elapsed += (o, ee) => ProcessDeletionQueue();
deletionTimer.Start();
}
else
{
// Subsequent file, reset timer.
deletionTimer.Stop();
deletionTimer.Start();
}
}
finally
{
rwlock.ExitWriteLock();
}
}
那么我该怎么做才能获得文件所在的原始路径,以及它们被移动到的新路径? (请参阅第一个问题,了解为什么定时器代码存在,以便在多文件移动中移动所有文件之前推迟处理事件。)
答案 0 :(得分:1)
您声明了两个计时器,但您只使用其中一个(在进程删除队列方法中使用相同的计时器)。所以看起来像是一个简单的复制/粘贴错误。
答案 1 :(得分:0)
我发现FileSystemWatcher事件没有排队(警告:这是大约8年前)。
如果您正在处理文件,并且在处理过程中创建了3个新文件,则不会获得3个事件。
处理完文件后,您可能需要手动检查目录是否有其他更改。