How to access an application parameters from a service?

Question

From my controllers, I access the application parameters (those in /app/config) with

$this->container->getParameter(\'my_param\')
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Answer 1

In symfony 4, we can access the parameters by means of dependency injection:

Services:

   use Symfony\Component\DependencyInjection\ContainerInterface as Container;

   MyServices {

         protected $container;
         protected $path;

         public function __construct(Container $container)
         {
             $this->container = $container;
             $this->path = $this->container->getParameter('upload_directory');
         }
    }

parameters.yml:

parameters:
     upload_directory: '%kernel.project_dir%/public/uploads'