如何用XML编写？
# src/Acme/MainBundle/Resources/config/services.yml
services:
acme_main.menu_builder:
class: Acme'MainBundle'Menu'MenuBuilder
arguments: ["@knp_menu.factory"]
acme_main.menu.main:
class: Knp'Menu'MenuItem # the service definition requires setting the class
factory_service: acme_main.menu_builder
factory_method: createMainMenu
arguments: ["@request"]
scope: request # needed as we have the request as a dependency here
tags:
- { name: knp_menu.menu, alias: main } # The alias is what is used to retrieve the menu
我试过了，但出现了下一个错误：xml:
<!-- Knp Menu -->
<service id="acme.menu_builder" class="Acme'FrontendBundle'Menu'MenuBuilder">
<argument type="service" id="knp_menu.factory" />
<argument type="service" id="security.context" />
</service>
<service id="acme.menu.main" class="Acme'Menu'MenuItem" scope="request">
<argument type="service" id="acme_menu.menu_builder" />
<argument type="service" id="request" />
<tag name="knp_menu.menu" alias="main" method="createMainMenu" />
</service>
错误：ErrorException: Catchable Fatal Error: Argument 2 passed to Knp'Menu'MenuItem::__construct() must implement interface Knp'Menu'FactoryInterface, instance of Symfony'Component'HttpFoundation'Request given
XML格式是从哪里获得的？它看起来像是一些完全不同的设置(例如，acme.menu_builder在yaml中有Acme'MainBundle'Menu'MenuBuilder类，在xml中有Acme'FrontendBundle'Menu'MenuBuilder。而acme.menu_builder服务在yaml和xml中有1个参数？
要回答你的问题，它应该看起来像这样：
<services>
<service id="acme_main.menu_builder"
class="Acme'MainBundle'Menu'MenuBuilder"
>
<argument type="service" id="knp_menu.factory" />
</service>
<service id="acme_main.menu.main"
class="Knp'Menu'MenuItem"
factory-service="acme_main.menu_builder"
factory-method="createMainMenu"
scope="request"
>
<argument type="service" id="request" />
<tag name="knp_menu.menu" alias="main" />
</service>
</services>