Question

我有一个简单的监听器示例 https://symfony.com/doc/current/event_dispatcher.html#content_wrapper

示例是1：1

services.yml是相同的

services:
    # default configuration for services in *this* file
    _defaults:
        # automatically injects dependencies in your services
        autowire: true
        # automatically registers your services as commands, event subscribers, etc.
        autoconfigure: true
        # this means you cannot fetch services directly from the container via $container->get()
        # if you need to do this, you can override this setting on individual services
        public: false

    # makes classes in src/AppBundle available to be used as services
    # this creates a service per class whose id is the fully-qualified class name
    # AppBundle\:
    #     resource: '../../src/AppBundle/*'
    #     # you can exclude directories or files
    #     # but if a service is unused, it's removed anyway
    #     exclude: '../../src/AppBundle/{Entity,Repository,Tests}'
    AppBundle\:
        resource: '../../src/AppBundle/*'
        # you can exclude directories or files
        # but if a service is unused, it's removed anyway
        exclude: '../../src/AppBundle/{Entity,Repository}'
    # controllers are imported separately to make sure they're public
    # and have a tag that allows actions to type-hint services
    # AppBundle\Controller\:
    #     resource: '../../src/AppBundle/Controller'
    #     public: true
    #     tags: ['controller.service_arguments']
    AppBundle\Controller\:
        resource: '../../src/AppBundle/Controller'
        public: true
        tags: ['controller.service_arguments']

但是，监听器被列为＆＃34;未被监听的听众＆＃34;

我做错了什么？

Answer 1

如果一个类实现了给定的接口，则可以自动标记它 - 这就是EventSubscriber示例的情况。如果侦听器没有提示容器构建器（接口或它扩展的类），那么就无法知道它应该被标记为侦听器，或者是哪些事件。

您可能希望在配置中显式标记侦听器，如示例所示。

# app/config/services.yml
services:
    AppBundle\EventListener\ExceptionListener:
        tags:
            - { name: kernel.event_listener, event: kernel.exception }

可以推断出订阅者，因为它在事件getSubscribedEvents()之间有明确的映射，如KernelEvents::EXCEPTION和要运行的类方法。

正如The Symfony 3.3 DI Container Changes Explained

所述

不适用于所有代码。许多标签都有必需的属性，例如事件监听器，您还需要在标记中指定事件名称和方法。自动配置仅适用于没有任何必需标记属性的标记

Symfony 3.3.9听众不能打电话

1 个答案: