How to create invoice programmatically in magento 2?

We just need to pass order id in generateInvoice($orderId) function from template. Below code snippet is used for generating Invoice in Magento 2, After generating an invoice automatically send the invoice mail to a customer who has placed the order.

<?php
namespace Rbj\Invoice\Block;

class Invoice extends \Magento\Framework\View\Element\Template
{
public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Sales\Api\OrderRepositoryInterface $orderRepository,
        \Magento\Sales\Model\Service\InvoiceService $invoiceService,
        \Magento\Framework\DB\TransactionFactory $transactionFactory,
        \Magento\Framework\Message\ManagerInterface $messageManager,
        \Magento\Sales\Model\Order\Email\Sender\InvoiceSender $invoiceSender,
        array $data = []
    ) {
        $this->orderRepository = $orderRepository;
        $this->invoiceService = $invoiceService;
        $this->transactionFactory = $transactionFactory;
        $this->messageManager = $messageManager;
        $this->invoiceSender = $invoiceSender;
        parent::__construct($context, $data);
    }
/**
 * Create Invoice Based on Order Object
 * @param \Magento\Sales\Model\Order $order
 * @return $this
 */
public function generateInvoice($orderId){
    try {
        $order = $this->orderRepository->get($orderId);
        if (!$order->getId()) {
            throw new \Magento\Framework\Exception\LocalizedException(__('The order no longer exists.'));
        }
        if(!$order->canInvoice()) {
            throw new \Magento\Framework\Exception\LocalizedException(
                    __('The order does not allow an invoice to be created.')
                );
        }

        $invoice = $this->invoiceService->prepareInvoice($order);
        if (!$invoice) {
            throw new \Magento\Framework\Exception\LocalizedException(__('We can\'t save the invoice right now.'));
        }
        if (!$invoice->getTotalQty()) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('You can\'t create an invoice without products.')
            );
        }
        $invoice->setRequestedCaptureCase(\Magento\Sales\Model\Order\Invoice::CAPTURE_OFFLINE);
        $invoice->register();
        $invoice->getOrder()->setCustomerNoteNotify(false);
        $invoice->getOrder()->setIsInProcess(true);
        $order->addStatusHistoryComment('Automatically INVOICED', false);
        $transactionSave = $this->transactionFactory->create()->addObject($invoice)->addObject($invoice->getOrder());
        $transactionSave->save();

        // send invoice emails, If you want to stop mail disable below try/catch code
        try {
            $this->invoiceSender->send($invoice);
        } catch (\Exception $e) {
            $this->messageManager->addError(__('We can\'t send the invoice email right now.'));
        }
    } catch (\Exception $e) {
        
        $this->messageManager->addError($e->getMessage());
    }

    return $invoice;
}

<?php

namespace Rbj\Invoice\Block;

class Invoice extends \Magento\Framework\View\Element\Template

{

public function __construct(

\Magento\Framework\View\Element\Template\Context $context,

\Magento\Sales\Api\OrderRepositoryInterface $orderRepository,

\Magento\Sales\Model\Service\InvoiceService $invoiceService,

\Magento\Framework\DB\TransactionFactory $transactionFactory,

\Magento\Framework\Message\ManagerInterface $messageManager,

\Magento\Sales\Model\Order\Email\Sender\InvoiceSender $invoiceSender,

array $data = []

) {

$this->orderRepository = $orderRepository;

$this->invoiceService = $invoiceService;

$this->transactionFactory = $transactionFactory;

$this->messageManager = $messageManager;

$this->invoiceSender = $invoiceSender;

parent::__construct($context, $data);

}

/**

* Create Invoice Based on Order Object

* @param \Magento\Sales\Model\Order $order

* @return $this

public function generateInvoice($orderId){

try {

$order = $this->orderRepository->get($orderId);

if (!$order->getId()) {

throw new \Magento\Framework\Exception\LocalizedException(__('The order no longer exists.'));

}

if(!$order->canInvoice()) {

throw new \Magento\Framework\Exception\LocalizedException(

__('The order does not allow an invoice to be created.')

);

}

$invoice = $this->invoiceService->prepareInvoice($order);

if (!$invoice) {

throw new \Magento\Framework\Exception\LocalizedException(__('We can\'t save the invoice right now.'));

}

if (!$invoice->getTotalQty()) {

throw new \Magento\Framework\Exception\LocalizedException(

__('You can\'t create an invoice without products.')

);

}

$invoice->setRequestedCaptureCase(\Magento\Sales\Model\Order\Invoice::CAPTURE_OFFLINE);

$invoice->register();

$invoice->getOrder()->setCustomerNoteNotify(false);

$invoice->getOrder()->setIsInProcess(true);

$order->addStatusHistoryComment('Automatically INVOICED', false);

$transactionSave = $this->transactionFactory->create()->addObject($invoice)->addObject($invoice->getOrder());

$transactionSave->save();

// send invoice emails, If you want to stop mail disable below try/catch code

try {

$this->invoiceSender->send($invoice);

} catch (\Exception $e) {

$this->messageManager->addError(__('We can\'t send the invoice email right now.'));

}

} catch (\Exception $e) {

$this->messageManager->addError($e->getMessage());

}

return $invoice;

}

Call function from a template,

$orderId = 1;
$block->generateInvoice($orderId);

1 2	$orderId = 1; $block->generateInvoice($orderId);

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