从ASP.NET Core的容器迁移到Autofac [英] Migration from ASP.NET Core's container to Autofac

问题描述

我正在使用ASP.NET Core及其内置容器.我想将我的注册迁移到Autofac.

I'm using ASP.NET Core and its builtin container. I want to migrate my registrations to Autofac.

Autifac文档没有迁移指南"，所以我想确保自己做的正确.

The Autifac docs don't have a "migration guide", so I want to be sure I'm doing things correctly.

ASP.NET Core container             -> Autofac
----------------------                -------

// the 3 big ones
services.AddSingleton<IFoo, Foo>() -> builder.RegisterType<Foo>().As<IFoo>().SingleInstance()
services.AddScoped<IFoo, Foo>()    -> builder.RegisterType<Foo>().As<IFoo>().InstancePerLifetimeScope()
services.AddTransient<IFoo, Foo>() -> builder.RegisterType<Foo>().As<IFoo>().InstancePerDependency()

// default
services.AddTransient<IFoo, Foo>() -> builder.RegisterType<Foo>().As<IFoo>()

// multiple
services.AddX<IFoo1, Foo>();
services.AddX<IFoo2, Foo>();       -> builder.RegisterType<Foo>().As<IFoo1>().As<IFoo2>().X()

// without interface
services.AddX<Foo>()               -> builder.RegisterType<Foo>().AsSelf().X()

还有更多的变化形式(例如，代表，IEnumerable<>)，但这是主要的变化形式.

There are more variations (e.g. delegates, IEnumerable<>), but these are the main ones.

这是正确的吗?我是否在某个地方缺少细微差别，因为Autofac非常复杂.

Is this correct? Am I missing some nuance somewhere, because Autofac is quite complex.

更新
到目前为止，评论都是但是为什么"的变化，但这并不重要(尽管我已经在其中一些评论中解释了我们的推理).这是一个合理的问题. 如果您对这两个容器都有经验，我将非常感谢您的投入.

UPDATE
Comments so far are of the "but why" variety, but that doesn't matter (though I've explained our reasoning in some of those comments). This is a legitimate question. If you have experience with both containers, I'd really appreciate your input.

(作为这些解释的简短摘要-在我们多年的经验中，我们已经学会了很难的方法，即提供两种方法来做同一件事绝不是一个好主意，因为这样做会使失败的几率增加100 ％，所以选择一种方法并坚持下去.一年后的今天，一些初级开发人员会因为某种替代方案而感到困惑，从而炸毁了某些东西.)

(As a short summary of those explanations - in our many years of experience, we've learned the hard way that providing two ways to do the same thing is never a good idea, because it increases your odds of failure by 100%. So choose one way and stick to it. A year from now some junior dev will blow something up because he gets confused by the alternatives.)

推荐答案

您应该使用Microsoft.Extensions.DependencyInjection中的.AddXxx方法进行注册，并将IServiceCollection传递给autofac.

You should use the .AddXxx methods from Microsoft.Extensions.DependencyInjection to register it and pass the IServiceCollection to autofac.

这使得在容器之间进行更改变得更加容易.

This makes it easier to change between containers.

当然，如果您需要Autofac/第三方IoC容器的某些功能(自动发现等)，则需要使用容器的本机方法.

Of course, if you need certain features of Autofac/3rd party IoC container (autodiscovery etc), then you need to use the containers native methods.

private readonly IContainer container;
public IServiceProvider ConfigureServices(IServiceCollection services) 
{
    // your normal registrations
    services.AddSingleton<IMySingleton,MySingleton>();

    var builder = new ContainerBuilder();
    builder.Populate(services);

    // build container 
    container = builder.Build();

    // and return it
    return new AutofacServiceProvider(container);
}

这篇关于从ASP.NET Core的容器迁移到Autofac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！