// Constructors
public DefaultAudioSwitch(IDisplayManager displayManager,
IAudioDeviceManager audioDeviceManager,
IConfigurationReader configurationReader,
IConfigurationWriter configurationWriter)
{
_displayManager = displayManager;
_audioDeviceManager = audioDeviceManager;
_configurationReader = configurationReader;
_configurationWriter = configurationWriter;
_configuration = CreateDefaultConfigurationIfNecessary(displayManager);
_lastDisplayNode = _displayManager.GetCurrentDisplayMode();
_displayManager.DisplayModeChanged += DisplayModeChanged;
_displayManager.StartPolling(1000);
}