有没有人有很好的类比依赖注入？ [英] Does anyone have a good analogy for dependency injection?

问题描述

我已经阅读了很多有关依赖注入的文章，并且观看了很多视频，但是我仍然无法自拔。有人有很好的比喻来解释吗？

I have read a lot of articles on Dependency Injection as well as watched a lot of videos, but I still can't get my head around it. Does anyone have a good analogy to explain it?

我看过了敏捷秋季的截图的第一部分，仍然有点困惑。

I watched the first part of the Autumn of Agile screencast and still was a little confused.

推荐答案

类比 ？我会给它一个打击...你的CD播放器立体声是无用的，没有CD上的音乐...（它依赖于CD）。如果他们使用CD内置CD播放器，那么它会很快无聊...

Analogy? I'll give it a whack... Your CD Player stereo is useless without a CD with music on it... (It's dependent on the CD). If they built CD Players with the CD already in it, it would get boring very quickly...

所以他们构建它们，以便您可以注入CD它依赖于它）进入播放器。这样，您可以每次注入不同的，并获得不同的行为（音乐），取决于您注入哪一个。

So they build them so you can "inject" the CD, (on which it is dependent) into the player. That way you can inject a different one each time, and get "different" behavior (music) dependent on which one you inject.

唯一的要求是CD必须是兼容 与 界面 。 （您不能在1992年CD播放机中播放蓝光光盘。）

The only requirement is that the CD must be compatible with the interface defined by the player. (You can't play a blue-ray disk in a 1992 CD player.)

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