获取洋红色 2 模块中的产品列表

我正在尝试将所有产品列表提取到magento2应用程序内的模块中，但无法弄清楚如何。

我的区块代码：

class Crud extends 'Magento'Framework'View'Element'Template
{
    protected $objectManager;
    public function __construct(Magento'Framework'View'Element'Template'Context $context,
        'Magento'Framework'View'Result'PageFactory $resultPageFactory,
        'Magento'Framework'ObjectManagerInterface $objectManager,
        'Magento'Framework'App'State $appState
    )
    {
        $this->objectManager = $objectManager;
      //  $appState->setAreaCode('frontend');
        parent::__construct($context);
    }
    function _prepareLayout(){}
    function getCrudName(){
        return "Products for holmes chat client";
    }
    function getProductList(){
     //   $objectMan= new 'Magento'Framework'App'ObjectManager;
        $objectMan= $this->$objectManager;
        $repo = $objectMan->get('Magento'Catalog'Model'ProductRepository');
        $search_criteria = $objectMan->create(
            'Magento'Framework'Api'SearchCriteriaInterface'
        );
        $result = $repo->getList($search_criteria);
      //  $list = $repo->getList();
      $products = $result->getItems();
        return $products;
        // return 'some';
    }
    function getProducts(){
        $objectMan = new Holmes'ChatClient'Api'ProductFetcher;
    }
}

我的模板代码：

<h2>This is a crud html</h2>
<h3>
    <?php
        echo $block->getCrudName();
    ?>
</h3>
<ul>
    <?php
       echo $block->getProductList();
    ?>
</ul>

我的浏览器抛出错误如下：

3 exception(s):
Exception #0 (Magento'Framework'Exception'LocalizedException): Invalid block type: Holmes'ChatClient'Block'Crud
Exception #1 (ReflectionException): Class Holmes'ChatClient'Block'Magento'Framework'View'Element'Template'Context does not exist
Exception #2 (ReflectionException): Class Holmes'ChatClient'Block'Magento'Framework'View'Element'Template'Context does not exist

我是 magento 的新手，如果我删除构造函数并从代码中删除方法getProductList()，块代码就可以工作。我可以在magento块中编写代码吗？