Drupal 8 Routing - Parameters to _controller - drupal

Question

my_module.content:
path: '/admin/my_module/{method}'
defaults:
_controller: '\Drupal\my_module\Controller\MyModuleController::%{method}' // Not working
How can I send a a parameter to the _controller? to switch between the methods of the controller
Thank you!

Answer 1

In the routing you have something like this
example.content:
path: '/example'
defaults:
_controller: '\Drupal\example\Controller\ExampleController::content'
requirements:
_permission: 'access content'
To give params from the URL:
Add a variable you want to receive in the controller later.
NOTICE: path: '/example/{id_param}'
example.content:
path: '/example/{id_param}'
defaults:
_controller: '\Drupal\example\Controller\ExampleController::content'
requirements:
_permission: 'access content'
Now, in the controller:
You'll have something like this
function content($id_param) {
echo($id_param);
}
That prints whatever you pass to the URL. For example yourdrupalsite.com/example/1920
Prints
1920

Answer 2

Passing parameter to form :
MODULE_NAME.contactform_results:
path: '/contactform/results/{PARAMETER}'
defaults:
_title: 'Contact Form Submissions'
_form: '\Drupal\MODULE_NAME\Form\TicketSendingForm'
requirements:
_permission: 'access control'
Then in form builder function
public function buildForm(array $form, FormStateInterface $form_state, $PARAMETER = null) {
echo ($PARAMETER);
}

Answer 3

In case you want to cast the parameter to an entity (fx. an ID), be aware that the parameter can't have underscores - alternatively use camelcase.
example.entity:
path: '/entity/{entityName}'
defaults:
_controller: '\Drupal\example\Controller\ExampleController::content'
requirements:
_permission: 'access content'
options:
parameters:
entityName:
type: entity:entity_name