I am trying to disable the focus assist light and I cannot find a valid method or property in MediaCapture.VideoDeviceController.FocusControl
Windows Phone's camera app allows configuring the focus assist light:
Have a look at the CameraManualControls SDK sample on the Microsoft Windows Universal Samples GitHub repo.
You'll find the necessary property for setting it under the FlashControl
:
private void FocusLightCheckBox_CheckedChanged(object sender, RoutedEventArgs e)
{
var flashControl = _mediaCapture.VideoDeviceController.FlashControl;
flashControl.AssistantLightEnabled = (FocusLightCheckBox.IsChecked == true);
}