How can I get Magento 2x admin path url in custom extension controller

Question

Is this possible to get admin path url in custom module controller? How can I get for Magento 2x? there I don't have default admin in path.

<?php
/**
 * Copyright © 2015 Technologymindz. All rights reserved.
 */

namespace Technologymindz\Instagramfeed\Controller\Adminhtml\Insta;
use Magento\Framework\Controller\ResultFactory;

class Auth extends \Technologymindz\Instagramfeed\Controller\Adminhtml\Insta
{
   public function __construct(
        //other stuff you need here
        \Magento\Framework\App\DeploymentConfig\Reader $configReader
    ) {
        $this->configReader = $configReader;
        //other stuff you need here, like parent::__construct($context, $data);
    }
    /**
     * Items list.
     *
     * @return \Magento\Backend\Model\View\Result\Page
     */
    public function execute()
    {

                $config = $this->configReader->load();
                $adminSuffix = $config['backend']['frontName'];
        echo   $adminUrl = $this->_storeManager->getStore()->getBaseUrl() . $adminSuffix;
        die;


    }
}

Answer 1

Use below code:

public function __construct(
        //other stuff you need here
        \Magento\Framework\App\DeploymentConfig\Reader $configReader
    ) {
        $this->configReader = $configReader;
        //other stuff you need here, like parent::__construct($context, $data);
    }

Use below line to get admin url:

$config = $this->configReader->load();
$adminSuffix = $config['backend']['frontName'];
$adminUrl = $this->_storeManager->getStore()->getBaseUrl() . $adminSuffix;

Answer 2

You can get the admin URL by making use of the helper class, \Magento\Backend\Helper\Data

Change your controller file like the following,

<?php 
namespace Technologymindz\Instagramfeed\Controller\Adminhtml\Insta;

use Magento\Framework\Controller\ResultFactory;

class Auth extends \Technologymindz\Instagramfeed\Controller\Adminhtml\Insta
{

public function __construct(
\Magento\Framework\App\DeploymentConfig\Reader $configReader,
\Magento\Backend\Helper\Data $HelperBackend )
{
    $this->configReader = $configReader;
    $this->HelperBackend = $HelperBackend;
    //other stuff you need here, like parent::__construct($context, $data);
}

 public function execute()
 {
    echo $this->HelperBackend->getHomePageUrl();
    die;
 }
}

Run the setup upgrade command and check the result.