在autofac容器解析之前必须注册每个类吗? [英] Have to register every class before the autofac container can resolve?

问题描述

让我们说这种情况:

public class B {};

public class C
{
     public C(B b){}
}

要从Autofac容器解析C，我必须将B和C都注册到容器. 但是，今天我使用了 Unity ，看来我只需要在容器中注册B，然后C就可以解决.

To resolve C from Autofac container, I have to register both B and C to container. But, today I used Unity, it seems I just need to register B to container, then C can be resolved.

那么Autofac不能像Unity一样吗?

So Autofac can't do as Unity do?

推荐答案

使用现成的Autofac，可以直接在Register...方法中将要使用的每种类型都注册到容器中或使用RegisterAssemblyTypes批量下载.但是也有其他选择，请参阅尼古拉斯有关解决所有问题的文章.所以是的，Autofac可以完成Unity的工作，但是您必须启用它.

With out-of-the-box Autofac it is expected that every type you want to use is registered with the container, either directly using the Register... methods or in bulk using RegisterAssemblyTypes. But there are other options too, take a look at Nicholas article about resolving everything. So yes, Autofac can do what Unity does, but you'll have to enable it.

更新:实际上，解决任何问题"功能现已内置，您可以执行以下操作:

Update: actually, the "resolve anything" feature is built-in now, and you can do the following:

        var cb = new ContainerBuilder();
        cb.RegisterSource(new AnyConcreteTypeNotAlreadyRegisteredSource());
        return cb.Build();

使用AnyConcreteTypeNotAlreadyRegisteredSource，您实际上可以解析C和B，而无需注册它们中的任何一个.

With the AnyConcreteTypeNotAlreadyRegisteredSource you can actually resolve both C and B without registering any of them.

请注意，由AnyConcreteTypeNotAlreadyRegisteredSource解析的服务的生命周期将为每个依赖关系范围" .

Note that the lifetime of services resolved by AnyConcreteTypeNotAlreadyRegisteredSource will be "per dependency scope".

注意:本主题 Autofac讨论组中的结束与此相关.

Note: this topic over at the Autofac discussion group is related.

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