Rendering contact_form

Question

I have call my current contactform with this function in mytheme.theme.

$form = Drupal::routeMatch()->getParameter('contact_form');

I have this

object(Drupal\contact\Entity\ContactForm)#412 (23) {
  ["id":protected]=>
  string(8) "feedback"
  ["label":protected]=>
  string(14) "Nous contacter"
  ["recipients":protected]=>
  array(1) {
    [0]=>
    string(21) "mymail@gmail.com"
  }
  ["reply":protected]=>
  string(0) ""
  ["weight":protected]=>
  int(0)
  ["originalId":protected]=>
  string(8) "feedback"
  ["pluginConfigKey":protected]=>
  NULL
  ["status":protected]=>
  bool(true)
  ["uuid":protected]=>
  string(36) "6e997e8b-9d85-4e59-9e43-67004270fe13"
  ["isSyncing":"Drupal\Core\Config\Entity\ConfigEntityBase":private]=>
  bool(false)
  ["isUninstalling":"Drupal\Core\Config\Entity\ConfigEntityBase":private]=>
  bool(false)
  ["langcode":protected]=>
  string(2) "fr"
  ["third_party_settings":protected]=>
  array(0) {
  }
  ["_core":protected]=>
  array(0) {
  }
  ["trustedData":protected]=>
  bool(false)
  ["entityTypeId":protected]=>
  string(12) "contact_form"
  ["enforceIsNew":protected]=>
  NULL
  ["typedData":protected]=>
  NULL
  ["cacheContexts":protected]=>
  array(1) {
    [0]=>
    string(28) "languages:language_interface"
  }
  ["cacheTags":protected]=>
  array(0) {
  }
  ["cacheMaxAge":protected]=>
  int(-1)
  ["_serviceIds":protected]=>
  array(0) {
  }
  ["dependencies":protected]=>
  array(0) {
  }
}

But how can I rendering this ? My goal is to render the current contact form.

Edit1: I have tried this How to programmatically render a contact form in a theme in D8

But when I try this

    $form = Drupal::routeMatch()->getParameter('contact_form');//get the current form called
    $message = \Drupal::entityManager()
      ->getStorage('contact_message')
      ->create(array(
        'contact_form' => $form->id(),
      ));
//$form->id() = 'feedback'
        $form = Drupal::service('entity.form_builder')->getForm($message);

I have a very big array (Firefox and Chrome crash when in print them )

When I try this

$form = Drupal::routeMatch()->getParameter('contact_form');//get the current form called
ContactController::contactSitePage($form);

I have this error

PHP Fatal error: Call to a member function getStorage() on null in /var/www/drupal8/core/modules/contact/src/Controller/ContactController.php on line 83

Why I would like to do this in my .theme file ?

Because I have begin to migrate a website in drupal 6 to drupal 8 .(I have try Drupal Upgrate and they works very good ) The page of this website has been built with a little home framework. It call many others not Drupal script. With this, not Drupal Script (Ex:tagada.com/horoscope.php ) and drupal page ( tagada.com/drupalpart/node/10) works with same css and html structure file in a external folder. In Drupal6 the theme worked correctly with a global variable object with node content $node

Answer 1

Finnaly I have find the answer to my problem's .

It was a drupal permission problem's .

User Anonymous users do not have permission to use the general contact form. I gave permission and everything worked .

Thank you alot for the advice .