session not getting value from phtml to block class magento 2

[jhon_doe2]

Please someone review my code and help me with suitable code or answer.
I need serious help from community.

Here's the link of code:
https://magento.stackexchange.com/questions/245457/session-not-getting-value-from-phtml-to-block-cla...

[gelanivishal]

Hello @jhon_doe2,

I found the equivalent way for this in Magento2:

Mage::getSingleton('core/session')->setMyValue('test');
Mage::getSingleton('core/session')->unsMyValue();

Set/Get/Unset Value in Core Session:

protected $_coreSession;

public function __construct(
    -----
    \Magento\Framework\Session\SessionManagerInterface $coreSession
    ){
    $this->_coreSession = $coreSession;
    ----
}

public function setValue(){
    $this->_coreSession->start();
    $this->_coreSession->setMessage('The Core session');
}

public function getValue(){
    $this->_coreSession->start();
    return $this->_coreSession->getMessage();
}

public function unSetValue(){
    $this->_coreSession->start();
    return $this->_coreSession->unsMessage();
}

By this way we can set custom values if our session value is not related to below sessions:

• \Magento\Backend\Model\Session
• \Magento\Catalog\Model\Session
• \Magento\Checkout\Model\Session
• \Magento\Customer\Model\Session
• \Magento\Newsletter\Model\Session

--
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[jhon_doe2]

Mage::getSingleton

This function is not working in my case.

[Rakesh Jesadiya]

Kindly use \Magento\Framework\Session\Generic class for default session,

    public function __construct(
            \Magento\Quote\Model\QuoteValidator $quoteValidator,
            \Magento\Framework\Session\Generic $session
        )  {
            $this->quoteValidator = $quoteValidator;
            $this->_coreSession = $coreSession;
        }
    
        public function getValue()
        {
            return $this->_coreSession->getMyValue(); //Get value from customer session
        }
    
        public function setValue($total_cost)
        {
            return $this->_coreSession->setMyValue($total_cost);
        }

[gelanivishal]

Hello @jhon_doe2,

Please use getModel function on it.

--
If my answer is useful, please Accept as Solution & give Kudos