public async void OnGeofenceStateChanged(GeofenceMonitor sender, object e)
{
var reports = sender.ReadReports();
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
foreach (GeofenceStateChangeReport report in reports)
{
GeofenceState state = report.NewState;
Geofence geofence = report.Geofence;
string eventDescription = GetTimeStampedMessage(geofence.Id);
eventDescription += " (" + state.ToString();
if (state == GeofenceState.Removed)
{
eventDescription += "/" + report.RemovalReason.ToString() + ")";
AddEventDescription(eventDescription);
// remove the geofence from the client side geofences collection
Remove(geofence);
// empty the registered geofence listbox and repopulate
geofenceCollection.Clear();
FillRegisteredGeofenceListBoxWithExistingGeofences();
}
else if (state == GeofenceState.Entered || state == GeofenceState.Exited)
{
// NOTE: You might want to write your app to take particular
// action based on whether the app has internet connectivity.
eventDescription += ")";
AddEventDescription(eventDescription);
}
}
});
}
//设置geofence listbox的数据源
private void FillRegisteredGeofenceListBoxWithhExistingGeofences()
{
//获取当前所有Geofence
IList <Geofence> geofences = GeofenceManager.Instance.GetGeofences();
//清空并重新填充geoItemCollection
geoItemCollection.Clear();
foreach (var g in geofences)
{
geoItemCollection.Insert(0, new GeofenceItem(g));
}
//重新绑定
RegisteredGeofenceListBox.DataContext = geoItemCollection;
if (geoItemCollection.Count > 0)
{
noItemHintTextBlock.Visibility = Visibility.Collapsed;
}
else
{
noItemHintTextBlock.Visibility = Visibility.Visible;
}
}