how to inject dependencies based on conditions in custom form?

I am creating one custom form and in this form I need to use one service which are there in another module. I need to use that dependency injection based on condition which are there in configuration.

Conditions in Config Form:

  1. Use Custom1 Form
  2. Use Custom2 Form

If “Use Custom1 Form” enabled, then I need to use dependency injection.

<?php namespace DrupaltestForm;  use DrupalCoreFormConfigFormBase; use DrupalCoreFormFormStateInterface; use SymphonyComponentDependencyInjectionContainerInterface; use Drupalcustom_form1ServicesTestService;  /**  * Test forms.  */ class TestForm extends ConfigFormBase {  /**  * PinCodeRegistration Object.  *  * @var Drupalcustom_form1ServicesTestService;  */ protected $TestService;  /**  * Constructs a new pin code multistep form.  *  * @param Drupalcustom_form1ServicesTestService $test_service  *   The service handler.  */ public function __construct(TestService $test_service) {   $this->TestService = $test_service; }  /**  * {@inheritdoc}  */ public static function create(ContainerInterface $container) {   return new static(     $container->get('custom_form1.form1_services')   ); } } 

How we will add "use Drupalcustom_form1ServicesTestService;" based on conditions.

If "custom_form1" module is uninstalled, then we are getting error. Any Idea how we need to avoid error and added dependency based on conditions?

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