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PeerWatcher.Removed イベント

定義

ピア アプリがワイヤレス範囲内でなくなったときに発生します。

// 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) 

イベントの種類

Windows の要件

アプリの機能
proximity

注釈

Removed イベントは、ピア アプリが列挙ピア アプリのコレクションから削除されるときに発生します。 これは、ユーザーがアプリを切り替えた場合、またはデバイスが範囲外になった場合に発生する可能性があります。

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);
                }
            }
        }
    });
}

適用対象

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