private async void ButtonConnect_Click(object sender, RoutedEventArgs e)
{
var selection = ConnectDevices.SelectedItems;
if (selection.Count <= 0)
{
return;
}
var obj = selection[0];
var entry = (DeviceListEntry)obj;
if (entry == null)
{
return;
}
// Create an EventHandlerForDevice to watch for the device we are connecting to
EventHandlerForDevice.CreateNewEventHandlerForDevice();
// Get notified when the device was successfully connected to or about to be closed
EventHandlerForDevice.Current.OnDeviceConnected = OnDeviceConnected;
EventHandlerForDevice.Current.OnDeviceClose = OnDeviceClosing;
// It is important that the FromIdAsync call is made on the UI thread because the consent prompt, when present,
// can only be displayed on the UI thread. Since this method is invoked by the UI, we are already in the UI thread.
var openSuccess =
await EventHandlerForDevice.Current.OpenDeviceAsync(entry.DeviceInformation, entry.DeviceSelector);
// Disable connect button if we connected to the device
UpdateConnectDisconnectButtonsAndList(!openSuccess);
await MainPage.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
MainPage.Current.GoToPage(1);
});
}
/// <summary>
/// If all the devices have been enumerated, select the device in the list we connected to. Otherwise let the EnumerationComplete event
/// from the device watcher handle the device selection
/// </summary>
/// <param name="sender"></param>
/// <param name="deviceInformation"></param>
private void OnDeviceConnected(EventHandlerForDevice sender, DeviceInformation deviceInformation)
{
// Find and select our connected device
if (_isAllDevicesEnumerated)
{
SelectDeviceInList(EventHandlerForDevice.Current.DeviceInformation.Id);
ButtonDisconnect.IsEnabled = true;
}
if (EventHandlerForDevice.Current.Device.PortName != "")
{
MainPage.Current.NotifyUser("Connected to - " +
EventHandlerForDevice.Current.Device.PortName +
" - " +
EventHandlerForDevice.Current.DeviceInformation.Id, NotifyType.StatusMessage);
}
else
{
MainPage.Current.NotifyUser("Connected to - " +
EventHandlerForDevice.Current.DeviceInformation.Id, NotifyType.StatusMessage);
}
// ReSharper disable once UnusedVariable
var asyncAction = MainPage.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => MainPage.Current.GoToPage(1));
}
/// <summary>
/// The device was closed. If we will autoreconnect to the device, reflect that in the UI
/// </summary>
/// <param name="sender"></param>
/// <param name="deviceInformation"></param>
private async void OnDeviceClosing(EventHandlerForDevice sender, DeviceInformation deviceInformation)
{
await MainPage.Current.Dispatcher.RunAsync(
CoreDispatcherPriority.Normal,
() =>
{
// We were connected to the device that was unplugged, so change the "Disconnect from device" button
// to "Do not reconnect to device"
if (ButtonDisconnect.IsEnabled)
{
ButtonDisconnect.IsEnabled = false;
}
});
}
/// <summary>
/// Creates a new instance of EventHandlerForDevice, enables auto reconnect, and uses it as the Current instance.
/// </summary>
public static void CreateNewEventHandlerForDevice()
{
_eventHandlerForDevice = new EventHandlerForDevice();
}
