是否可以在没有依赖项注入（DDD）的情况下在聚合（域层）中实现MediatR？ [英] Is it possible to implement MediatR in the Aggregates (Domain Layer) without dependency injection (DDD)?

问题描述

为防止重新发明轮子，我想在聚合中使用MediatR发布域事件。 （Un）Fortunately（？）MediatR用作注入到类中的依赖项，而不是我可以静态调用的依赖项。因此，我最终将通过构造函数创建对库的直接依赖关系。

To prevent reinventing the wheel, I'd like to use MediatR in the Aggregates to publish domain events. (Un)Fortunately(?) MediatR works as a dependency that is injected into the classes, and not something that I can call statically. Therefore I'd end up creating a direct dependency on the library via the constructor.

我不记得在哪里读（如果我没看错的话），我应该避免在聚合的构造函数中使用非业务依赖项。

I don't remember where I read it (and if I read it right), that I should avoid non-business dependencies in the constructors of the Aggregates.

因此，我不应该这样做：

Therefore, I shouldn't do something like this:

public class MyAggregate
{
    private readonly IMediator _mediator;
    public MyAggregate(IMediator mediator)
    {
        _mediator = mediator;
    }
}

这让我深入思考是否有可能或建议（或不建议使用）在汇总中使用MediatR ...

That made me think deeply whether it was possible or recommended (Or not recommended) to use MediatR in the Aggregates...

我是否可以静态使用MediatR，还是应该实现自己的Event Dispatcher？

Is there a way for me to use MediatR statically or should I implement my own Event Dispatcher?

P.S：另外，如果我对聚合依赖项的理解不正确，请随时纠正我。

P.S: Also, feel free to correct me if my understanding of the Aggregates dependencies are wrong.

P.S x2：
我已经搜索过Google和SO，因此找不到答案。
https://stackoverflow.com/search?q=mediatr+domain+events
如何将MediatR与我的业务层分离
DDD：从域项目中引用MediatR接口

P.S x2: I've searched Google and SO and can't find an answer to this. https://stackoverflow.com/search?q=mediatr+domain+events How to decouple MediatR from my business layer DDD: Referencing MediatR interface from the domain project

推荐答案

我应该避免$ b的构造函数中的非业务依赖性$ b聚合。

I should avoid non-business dependencies in the constructors of the Aggregates.

不仅在构造函数中；您的业​​务层不应以任何形式依赖于非业务；甚至是静态的。

Not only in constructors; your business layer should not have dependencies to non-business in any form; even static.

我要做的只是将域事件从聚合返回到应用程序层，然后发布域事件。

What I do is just return the domain event from the aggregate to the application layer and then publish the domain event.

请阅读以下几篇文章，以更好地理解我的意思：

Please read these couple of post to better understand what I mean:

不要发布域事件，请返回它们！
DDD-Application-Services-Explained

这篇关于是否可以在没有依赖项注入（DDD）的情况下在聚合（域层）中实现MediatR？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！