Form.php

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<?php
namespace Magento\Customer\Block\Adminhtml\Edit;

use Magento\Customer\Controller\RegistryConstants;

class Form extends \Magento\Backend\Block\Widget\Form\Generic
{
    protected $_customerRepository;

    protected $_extensibleDataObjectConverter;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Data\FormFactory $formFactory,
        \Magento\Customer\Api\CustomerRepositoryInterface $customerRepository,
        \Magento\Framework\Api\ExtensibleDataObjectConverter $extensibleDataObjectConverter,
        array $data = []
    ) {
        $this->_customerRepository = $customerRepository;
        $this->_extensibleDataObjectConverter = $extensibleDataObjectConverter;
        parent::__construct($context, $registry, $formFactory, $data);
    }

    protected function _prepareForm()
    {
        $form = $this->_formFactory->create(
            [
                'data' => [
                    'id' => 'edit_form',
                    'action' => $this->getUrl('customer/*/save'),
                    'method' => 'post',
                    'enctype' => 'multipart/form-data',
                ],
            ]
        );

        $customerId = $this->_coreRegistry->registry(RegistryConstants::CURRENT_CUSTOMER_ID);

        if ($customerId) {
            $form->addField('id', 'hidden', ['name' => 'customer_id']);
            $customer = $this->_customerRepository->getById($customerId);
            $form->setValues(
                $this->_extensibleDataObjectConverter->toFlatArray(
                    $customer,
                    [],
                    \Magento\Customer\Api\Data\CustomerInterface::class
                )
            )->addValues(
                ['customer_id' => $customerId]
            );
        }

        $form->setUseContainer(true);
        $this->setForm($form);
        return parent::_prepareForm();
    }
}