/// <summary>
/// Executes when a device is updated
/// </summary>
/// <param name="sender">The device watcher.</param>
/// <param name="deviceInfoUpdate">The update device information.</param>
private async void DeviceWatcher_Updated(DeviceWatcher sender, DeviceInformationUpdate deviceInfoUpdate)
{
ObservableBluetoothLEDevice device = null;
device = BluetoothLeDevices.FirstOrDefault(i => i.DeviceInfo.Id == deviceInfoUpdate.Id);
if (device != null)
{
await device.UpdateAsync(deviceInfoUpdate);
}
if (device == null)
{
if (_readerWriterLockSlim.TryEnterWriteLock(TimeSpan.FromSeconds(2)))
{
var unusedDevice = _unusedDevices.FirstOrDefault(i => i.Id == deviceInfoUpdate.Id);
if (unusedDevice != null)
{
_unusedDevices.Remove(unusedDevice);
unusedDevice.Update(deviceInfoUpdate);
}
_readerWriterLockSlim.ExitWriteLock();
// The update to the unknown device means we should move it to the Bluetooth LE Device collection.
await AddDeviceToList(unusedDevice);
}
}
}
/// <summary>
/// Adds the new or updated device to the displayed or unused list
/// </summary>
/// <param name="deviceInfo">The device to add</param>
/// <returns>The task being used to add a device to a list</returns>
private async Task AddDeviceToList(DeviceInformation deviceInfo)
{
// Make sure device name isn't blank or already present in the list.
if (!string.IsNullOrEmpty(deviceInfo?.Name))
{
var device = new ObservableBluetoothLEDevice(deviceInfo);
var connectable = true;
if (device.DeviceInfo.Properties.Keys.Contains("System.Devices.Aep.Bluetooth.Le.IsConnectable"))
{
connectable = (bool)device.DeviceInfo.Properties["System.Devices.Aep.Bluetooth.Le.IsConnectable"];
}
if (connectable)
{
await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(
CoreDispatcherPriority.Normal,
() =>
{
if (_readerWriterLockSlim.TryEnterWriteLock(TimeSpan.FromSeconds(1)))
{
if (!BluetoothLeDevices.Contains(device))
{
BluetoothLeDevices.Add(device);
}
_readerWriterLockSlim.ExitWriteLock();
}
});
return;
}
}
if (_readerWriterLockSlim.TryEnterWriteLock(TimeSpan.FromSeconds(1)))
{
_unusedDevices.Add(deviceInfo);
_readerWriterLockSlim.ExitWriteLock();
}
}