Symfony 2 服务容器为空 [英] Symfony 2 service container is null

问题描述

我是 Symfony 2 的新手，正在尝试创建一些简单的应用程序来学习.我创建了一个包 GoogleApiBundle.在捆绑包内，我有一个控制器 YouTubeController，这是一项服务:

I am new to Symfony 2 and trying to create some simple application to learn. I created a bundle GoogleApiBundle. Inside the bundle, I have a controller YouTubeController, which is a service:

//services.yml
service:
    myname_googleapi_youtube:
        class: Myname\GoogleApiBundle\Controller\YouTubeController

在另一个包中，我尝试调用 YouTubeController

In another bundle, I try to call a function in YouTubeController

//anotherController.php
$service = $this->get('myname_googleapi_youtube');
$result = $service->getResultFunction();

//YouTubeController.php
public function getResultFunction()
{
    $parameter = $this->container->getParameter('a');
    //...
}

然后我得到一个异常 FatalErrorException: Error: Call to a member function getParameter() on a non-object ...，因为 $this->container是 NULL.

Then I get an exception FatalErrorException: Error: Call to a member function getParameter() on a non-object ..., because $this->container is NULL.

我搜索了但没有得到答案.我做错了吗?

I searched but didn't get an answer. Am I doing wrong?

推荐答案

//services.yml
service:
    myname_googleapi_youtube:
        class: Myname\GoogleApiBundle\Controller\YouTubeController
        arguments: [@service_container]

你会:

<?php

namespace Myname\GoogleApiBundle\Controller

use Symfony\Component\DependencyInjection\ContainerInterface;

class YouTubeController
{
    /**
    * @param ContainerInterface $container
    */
    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;
    }

    /**
    * Obtain some results
    */
    public function getResultFunction()
    {
        $parameter = $this->container->getParameter('a');
        //...
    }

    /**
    * Get a service from the container
    *
    * @param string The service to get
    */
    protected function get($service)
    {
        return $this->container->get($service);
    }
}

<小时>

这种做法很有争议，因此我建议您快速阅读以下内容:

---

This practice is very controversial, so I'd recommend that you have a quick read at these:

• Symfony2 中的控制器即服务
• 您想要 DIC 与该控制器吗?
• Symfony2:制作我的控制器服务?

这篇关于Symfony 2 服务容器为空的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！