How to Update customer in magento 2.2 programmatically?

Question

I want to update customer information programmatically. so I have used below code.

public function execute()
{
    $resultRedirect = $this->resultRedirectFactory->create();
try{
    $path = $this->filesystem->getDirectoryRead(DirectoryList::MEDIA)->getAbsolutePath('catalog/import/epicore/UPB-customers.csv');
    $dataExcel = fopen($path, "r");
    while (!feof($dataExcel) ) {
        $line_of_text[] = fgetcsv($dataExcel, 1024);
    }
    array_shift($line_of_text); 
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    foreach($line_of_text as $customerNewData){
        $websiteId  = $this->storeManager->getWebsite()->getWebsiteId();
        $customer = $objectManager->create('Magento\Customer\Api\CustomerRepositoryInterface')->getById($customerNewData[0]);
        //echo "<pre>"; print_r($customer->getData()); exit;            
        if(count($customer)){
            $data = array(); 
            $email = $customer->getEmail();             
            $customer->setWebsiteId($websiteId);
            $customer->setData("custid", $customerNewData[1]);
            $customer->setData("custnum", $customerNewData[2]);
            $customer->setData("salesforceid", $customerNewData[3]);
            $customer->setEmail($email);                
            $customer->save();
        }else{

        }   
    }           
} catch(\Exception $e) {
        echo $e->getMessage(); exit;
}
$this->_redirect('*/*/');
    return;
}

But Its returns "Please enter email address" error.

Answer 1

You should use service contracts instead of Model Class (and strictly don't use object manager)

protected $customerRepository;

public function __construct(
    ------------------
    \Magento\Customer\Api\CustomerRepositoryInterface $customerRepository,
    -----------------
)
{
    ------------
    $this->customerRepository = $customerRepository;
    -----------
}

public function {myFunction}(){

    $customer = $this->customerRepository->getById($customerNewData[0]);

    if($customer->getId())
    {
    $customer->setWebsiteId($websiteId);
            $customer->setCustid($customerNewData[1]);
            $customer->setCustnum($customerNewData[2]);
            $customer->setSalesforceid($customerNewData[3]);
            $customer->setEmail($email);
    }
    $this->customerRepository->save($customer)  ;
}