public SourceUSBCam()
{
InitializeComponent();
var camList = FrameSource.GetAllConnectedCameras();
cameraList.ItemsSource = camList;
if (camList.Count > 0)
{
var lastOpen = Datastore.GeneralGetValue("usb_cam_last");
cameraList.SelectedItem = camList.FirstOrDefault(i => i.Name.Equals(lastOpen)) ?? camList[0];
}
}