Defines the interface for an action invoker, which is used to invoke an asynchronous action in response to an HTTP request.
定义操作调用程序的接口，该调用程序用于调用一个异步操作以响应HTTP请求。
Provides information about an asynchronous action method, such as its name, controller, parameters, attributes, and filters.
封装描述异步控制器的信息，如控制器的名称、类型和操作。
If you must take action relatively quickly after an event occurs or data changes, asynchronous messaging is by far the easier and more efficient way to accomplish this.
如果在事件发生或数据更改之后必须采取相对迅速的行动，那么异步消息传递是完成这一任务更容易和更有效的方法。
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