一般的想法是通过请求参数传递选择的范围。
我认为您应该在产品编辑操作中使用类似的代码:
/** @var \Magento\Store\Model\StoreManagerInterface $storeManager */
$storeManager = $this->_objectManager->get('Magento\Store\Model\StoreManagerInterface');
$storeId = (int) $this->getRequest()->getParam('store', 0);
$store = $storeManager->getStore($storeId);
$storeManager->setCurrentStore($store->getCode());
在这种情况下,$store->getWebsiteId()应该是实际的(选定的)网站ID。但这只能在您使用存储块的情况下进行,该存储块的工作方式与标准magento块相同(选择存储范围):

这是我选择默认商店视图(id == 1)时的示例结果:

这是默认的全局范围(“ 所有商店视图 ”的网站ID为0):

更新:
您可以在助手中添加这样的方法,并在需要的地方使用它:
/**
 * @var \Magento\Framework\App\State
 */
protected $state;
/**
 * @var \Magento\Store\Model\StoreManagerInterface
 */
protected $storeManager;
/**
 * Data constructor.
 * @param Context $context
 * @param \Magento\Framework\App\State $state
 * @param \Magento\Store\Model\StoreManagerInterface $storeManager
 */
public function __construct(
    Context $context,
    \Magento\Framework\App\State $state,
    \Magento\Store\Model\StoreManagerInterface $storeManager
) {
    parent::__construct($context);
    $this->state = $state;
    $this->storeManager = $storeManager;
}
/**
 * @return int
 */
public function resolveCurrentWebsiteId()
{
    if ($this->state->getAreaCode() == \Magento\Framework\App\Area::AREA_ADMINHTML) {
        // in admin area
        /** @var \Magento\Framework\App\RequestInterface $request */
        $request = $this->_request;
        $storeId = (int) $request->getParam('store', 0);
    } else {
        // frontend area
        $storeId = true; // get current store from the store resolver
    }
    $store = $this->storeManager->getStore($storeId);
    $websiteId = $store->getWebsiteId();
    return $websiteId;
}
结果应该是这样的:
- 没有范围选择器的后端-0    
 
- 具有范围选择器支持- 选定的网站ID;如果未选择则为0(所有商店视图)    
 
- 前端- 当前网站ID    
 
如果您正在寻找前端的短途路线:
您可以Magento\Store\Model\StoreResolver为此目的使用该类:
/**
 * @var \Magento\Store\Model\StoreResolver
 */
private $storeResolver;
/**
 * @param \Magento\Store\Model\StoreResolver $storeResolver
 */
public function __construct(
    \Magento\Store\Model\StoreResolver $storeResolver
) {
    $this->storeResolver = $storeResolver;
}
/**
 * Returns the current store id, if it can be detected or default store id
 * 
 * @return int|string
 */
public function getCurrentStoreId()
{
    return $this->storeResolver->getCurrentStoreId();
}
它可以正确检测前端区域上当前选择的商店视图,但对于管理区域没有用。