无法在Drupal 8中获得Class实例

Question

我的主控制器是：

namespace Drupal\facebook_sharer\Controller;
use Drupal\Core\Controller\ControllerBase;
use Facebook\Facebook; 
use Symfony\Component\DependencyInjection\ContainerInterface;
use Drupal\Core\Routing\TrustedRedirectResponse;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Drupal\facebook_sharer\FbConnectFbManager;
use Drupal\facebook_sharer\FbConnectPersistentDataHandler;
use Drupal\facebook_sharer\FbConnectFbFactory;

class Facebook_sharerController extends ControllerBase {
  protected $fbManager;
  protected $persistentDataHandler;
  protected $fbFactory;

  public function __construct(FbConnectFbManager $fb_manager, FbConnectPersistentDataHandler $persistent_data_handler, FbConnectFbFactory $fb_factory) {
    $this->fbManager = $fb_manager;
    $this->persistentDataHandler = $persistent_data_handler;
    $this->fbFactory = $fb_factory;
  } 

在Facebook_sharerController.php文件中

我想访问模块文件中的此类对象，我尝试这样做但失败了

$fb_share_manager = new Facebook_sharerController();

我也尝试使用服务

 $d = \Drupal::service("Drupal\facebook_sharer\Controller\Facebook_sharerController");
  var_dump(get_class($d));die;

但是它不起作用。 请帮助我。