PeerWatcher.Added 事件

定义

命名空间:

Windows.Networking.Proximity

在无线范围内找到对等应用时发生。

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

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

// Revoke with event_revoker
PeerWatcher::Added_revoker Added(auto_revoke_t, TypedEventHandler<PeerWatcher, PeerInformation const&> const& handler) const;

public event TypedEventHandler<PeerWatcher,PeerInformation> Added;

function onAdded(eventArgs) { /* Your code */ }
peerWatcher.addEventListener("added", onAdded);
peerWatcher.removeEventListener("added", onAdded);
- or -
peerWatcher.onadded = onAdded;

Public Custom Event Added As TypedEventHandler(Of PeerWatcher, PeerInformation) 

事件类型

TypedEventHandler<PeerWatcher,PeerInformation>

Windows 要求

应用功能

proximity

注解

重要

对于Windows Phone 8.x 应用，从添加的事件处理程序中调用 PeerFinder.ConnectAsync 将失败。 相反，请在此事件处理程序外部调用它，例如，当用户显式选择连接到对等方时。

通过调用 Start方法启动 PeerWatcher后，将针对在无线范围内找到的每个对等应用引发 Addedevent。 PeerWatcher会继续扫描范围内的对等应用，直到调用 Stop方法。 使用 Addedevent，可以在找到用户时向用户显示对等应用。

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_Added(PeerWatcher sender, PeerInformation peerInfo)
{
    var result = Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
    {
        lock (this)
        {
            _discoveredPeers.Add(peerInfo);
        }
    });
}

另请参阅

• 邻近感应和点击 (C#/VB/C++)
• 邻近感应示例