# 方法注入

在应用程序一些地方Laravel不仅读取了构造签名，它还读取了方法签名并执行了注入依赖。

使用方法注入最常见的地方是控制器方法，如果你有一个依赖想要为控制器方法使用，你可以如示例11-13一样注入到方法中。

{% code title="Example 11-13. Injecting dependencies into a controller method" %}

```php
class MyController extends Controller{
    // Method dependencies can come after or before route parameters.
    public function show(Logger $logger, $id) {
        // Do something
        $logger->error('Something happened');
    }
}
```

{% endcode %}

> 使用makeWith()传递不可解析的构造参数
>
> 所有用于解析类实例的工具-app(),$container->make()等等。假设可以解析类的所有依赖项，而无需传入任何内容，但是，如果您的类在其构造函数中接受一个值，而不是容器可以为您解决的依赖项，该怎么办？请使用makeWith()方法。

```php
class Foo {
    public function __construct($bar) {
        // ...
    } 
}
$foo = $this->app->makeWith(
    Foo::class,
    ['bar' => 'value']
);
```

> 这是一个不常见案例。 您将从容器中解析出来的大多数类应将依赖项注入其构造函数中。

服务提供者者的boot()方法也可以做同样的事，你也可以在容器上调动任意类的任意方法，用于进行方法注入，如示例11-14。

{% code title="Example 11-14. Manually calling a class method using the container’s call() method" %}

```php
class Foo {
    public function bar($parameter1) {} 
}
// Calls the 'bar' method on 'Foo' with a first parameter of 'value'
app()->call('Foo@bar', ['parameter1' => 'value']);
```

{% endcode %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://liseen315.gitbook.io/laravel/rong-qi/fang-fa-zhu-ru.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.