如何避免依赖注入的构造函数的疯狂？ [英] How to avoid Dependency Injection constructor madness?

问题描述

我发现我的构造函数开始看起来是这样的：

I find that my constructors are starting to look like this:

public MyClass(Container con, SomeClass1 obj1, SomeClass2, obj2.... )

不断增加的参数列表。由于集装箱是我的依赖注入容器，为什么我不能只是这样做：

with ever increasing parameter list. Since "Container" is my dependency injection container, why can't I just do this:

public MyClass(Container con)

每类？哪些缺点？如果我这样做，感觉就像我使用的是静态的荣耀。请分享你的IoC和依赖注入疯狂的想法。

for every class? What are the downsides? If I do this, it feels like I'm using a glorified static. Please share your thoughts on IoC and Dependency Injection madness.

推荐答案

您是对的，如果你使用的容器作为服务定位器，它更多或更少的荣耀静态工厂。对于很多原因我认为这是一个反模式。

You are right that if you use the container as a Service Locator, it's more or less a glorified static factory. For lots of reasons I consider this an anti-pattern.

一个构造器注入的美妙的好处是，它使违反单一职责原则昭然若揭。

One of the wonderful benefits of Constructor Injection is that it makes violations of the Single Responsibility Principle glaringly obvious.

当发生这种情况，它的时间来重构到门面服务。总之，建立一个新的，更加粗粒度界面，隐藏的部分或全部，你目前需要细粒度的依赖之间的互动。

When that happens, it's time to refactor to Facade Services. In short, create a new, more coarse-grained interface that hides the interaction between some or all of the fine-grained dependencies you currently require.

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