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PeerWatcher.Removed Evento

  • Referencia

Definición

Espacio de nombres:
Windows.Networking.Proximity
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Se produce cuando una aplicación del mismo nivel ya no está dentro del intervalo inalámbrico.

// Register
event_token Removed(TypedEventHandler<PeerWatcher, PeerInformation const&> const& handler) const;

// Revoke with event_token
void Removed(event_token const* cookie) const;

// Revoke with event_revoker
PeerWatcher::Removed_revoker Removed(auto_revoke_t, TypedEventHandler<PeerWatcher, PeerInformation const&> const& handler) const;
public event TypedEventHandler<PeerWatcher,PeerInformation> Removed;
function onRemoved(eventArgs) { /* Your code */ }
peerWatcher.addEventListener("removed", onRemoved);
peerWatcher.removeEventListener("removed", onRemoved);
- or -
peerWatcher.onremoved = onRemoved;
Public Custom Event Removed As TypedEventHandler(Of PeerWatcher, PeerInformation)

Tipo de evento

TypedEventHandler<PeerWatcher,PeerInformation>

Requisitos de Windows

Características de aplicaciones
proximity

Comentarios

El evento Removed se genera cuando se quita una aplicación del mismo nivel de la colección de aplicaciones del mismo nivel enumeradas. Esto puede ocurrir si un usuario cambia las aplicaciones o si un dispositivo ya no está dentro del intervalo.

private PeerWatcher _peerWatcher;
private bool _peerWatcherIsRunning = false;
private bool _peerFinderStarted = false;

// The list of peers discovered by the PeerWatcher.
ObservableCollection<PeerInformation> _discoveredPeers = new ObservableCollection<PeerInformation>();
void PeerFinder_StartPeerWatcher(object sender, RoutedEventArgs e)
{
    if (!_peerFinderStarted)
    {
        // PeerFinder must be started first.
        return;
    }

    if (_peerWatcherIsRunning)
    {
        // PeerWatcher is already running.
        return;
    }

    try
    {
        if (_peerWatcher == null)
        {
            _peerWatcher = PeerFinder.CreateWatcher();

            // Add PeerWatcher event handlers. Only add handlers once.
            _peerWatcher.Added += PeerWatcher_Added;
            _peerWatcher.Removed += PeerWatcher_Removed;
            _peerWatcher.Updated += PeerWatcher_Updated;
            _peerWatcher.EnumerationCompleted += PeerWatcher_EnumerationCompleted;
            _peerWatcher.Stopped += PeerWatcher_Stopped;
        }

        // Empty the list of discovered peers.
        _discoveredPeers.Clear();

        // Start the PeerWatcher.
        _peerWatcher.Start();

        _peerWatcherIsRunning = true;
    }
    catch (Exception ex)
    {
        // Exceptions can occur if PeerWatcher.Start is called multiple times or
        // PeerWatcher.Start is called the PeerWatcher is stopping.
    }
}

protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
    if (_peerWatcher != null)
    {
        // Remove event handlers.
        _peerWatcher.Added -= PeerWatcher_Added;
        _peerWatcher.Removed -= PeerWatcher_Removed;
        _peerWatcher.Updated -= PeerWatcher_Updated;
        _peerWatcher.EnumerationCompleted -= PeerWatcher_EnumerationCompleted;
        _peerWatcher.Stopped -= PeerWatcher_Stopped;

        _peerWatcher = null;
    }
}

private void PeerWatcher_Removed(PeerWatcher sender, PeerInformation peerInfo)
{
    var result = Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
    {
        lock (this)
        {
            // Find and remove the peer form the list of discovered peers.
            for (int i = 0; i < _discoveredPeers.Count; i++)
            {
                if (_discoveredPeers[i].Id == peerInfo.Id)
                {
                    _discoveredPeers.RemoveAt(i);
                }
            }
        }
    });
}

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