gwin003 gwin003 -4 years ago 177
C# Question

FileSystemWatcher not firing events

For some reason, my

FileSystemWatcher
is not firing any events whatsoever. I want to know any time a new file is created, deleted or renamed in my directory.
_myFolderPath
is being set correctly, I have checked.

Here is my current code:

public void Setup() {
var fileSystemWatcher = new FileSystemWatcher(_myFolderPath);
fileSystemWatcher.NotifyFilter = NotifyFilters.LastAccess |
NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;

fileSystemWatcher.Changed += FileSystemWatcherChanged;
fileSystemWatcher.Created += FileSystemWatcherChanged;
fileSystemWatcher.Deleted += FileSystemWatcherChanged;
fileSystemWatcher.Renamed += FileSystemWatcherChanged;

fileSystemWatcher.Filter = "*.*";
fileSystemWatcher.EnableRaisingEvents = true;
}

private void FileSystemWatcherChanged(object sender, FileSystemEventArgs e)
{
MessageBox.Show("Queue changed");
listBoxQueuedForms.Items.Clear();
foreach (var fileInfo in Directory.GetFiles(_myFolderPath, "*.*", SearchOption.TopDirectoryOnly))
{
listBoxQueuedForms.Items.Add(fileInfo));
}
}

Answer Source

You seem to be creating the FileSystemWatcher as a local variable in the setup method. This will of course go out of scope at the end of the method and may well be getting tidied up at that point, thus removing the watches.

Try creating the FSW at a point where it will be persisted (eg a program level variable) and see if that sorts you out.

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