Wpf application fails to close when to close

Question

I have a WPF application that uses the FileSystemWatcher. The watcher is created in a viewmodel, the viewmodel is set to the DataContext of my mainwindow.

I have the following method to start watching in the ViewModel :

        public void StartWatching()
        {
            _watcher = new FileSystemWatcher(Folder) {Filter = "", NotifyFilter = NotifyFilters.LastAccess | 
                         NotifyFilters.LastWrite | 
                         NotifyFilters.FileName | 
                         NotifyFilters.DirectoryName};
            
            _watcherSubscription = Observable.FromEventPattern<FileSystemEventHandler, FileSystemEventArgs>(
                h => _watcher.Created += h,
                h => _watcher.Created -= h)
                .ObserveOnDispatcher()
                .Select(e=>e.EventArgs)
                .Where(e=>e.ChangeType==WatcherChangeTypes.Created)
                .Subscribe(FolderChanged2);

            _watcher.EnableRaisingEvents = true;    
            
        }

When I close the application I call a method on my viewmodel : StopWatching

       public void StopWatching()
        {
            _watcherSubscription.Dispose();
            _watcher.EnableRaisingEvents = false;
            _watcher.Dispose();
        }

But when I close the application, it seems to hang. When  I remove the part that creates the subscription, the application terminates normally. What am I doing wrong ?

Answer 1

Is StopWatching successfully running when called or is it hanging in the Dispose of the _watcher?

Answer 2

Sorry, the problem is solved, the cause was not the subscription, but a notify window that is shown when the event is triggered was not closed on closing the application.