C# Autofac：解析类型的所有实例
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Autofac: Resolve all instances of a Type
提问by crowleym
Given the following registrations
鉴于以下注册
builder.Register<A>().As<I>();
builder.Register<B>().As<I>();
builder.Register<C>().As<I>();
var container = builder.Build();
I am looking to resolve all instances of type I as a IEnumerable(Array or Collection it doesn't matter).
我希望将 I 类型的所有实例解析为IEnumerable（数组或集合无关紧要）。
In Windsor I would have written the following.
在温莎，我会写以下内容。
foreach(I i in container.ResolveAll<I>())
{
...
}
I am migrating from Windsor to Autofac 1.4.4.561 but can't see the equivalent syntax.
我正在从 Windsor 迁移到 Autofac 1.4.4.561，但看不到等效的语法。
采纳答案by Philip Rieck
For current versons of Autofac: ( 2.0+, so anything you should be using today)
对于当前版本的 Autofac：（2.0+，所以你今天应该使用的任何东西）
You register multiple ILoggers(for example):
您注册多个ILoggers（例如）：
var builder = new ContainerBuilder();
builder.Register<ConsoleLogger>()
.As<ILogger>();
builder.Register<EmailLogger>()
.As<ILogger>()
.PreserveExistingDefaults(); //keeps console logger as the default
Then get all ILoggers:
然后得到所有ILogger的：
var loggers = container.Resolve<IEnumerable<ILogger>>();
You don't need to do anything special, just ask for an IEnumerable<T>of the desired type. Autofac has collection support out of the box, along with other adaptersthat can wrap your components with additional functionality.
你不需要做任何特别的事情，只需要求一个IEnumerable<T>所需的类型。Autofac 具有开箱即用的集合支持，以及其他可以为您的组件包装附加功能的适配器。
This is the same usage as the pre-2.x ImplicitCollectionSupportModule, but baked right in.
这与 2.x 之前的 ImplicitCollectionSupportModule 的用法相同，但刚好融入其中。
For old versions (0.X - 1.4)
对于旧版本 (0.X - 1.4)
Two ways:
两种方式：
1) Use the collection registration
1）使用收藏注册
var builder = new ContainerBuilder();
builder.RegisterCollection<ILogger>()
.As<IEnumerable<ILogger>>();
builder.Register<ConsoleLogger>()
.As<ILogger>()
.MemberOf<IEnumerable<ILogger>>();
builder.Register<EmailLogger>()
.As<ILogger>()
.MemberOf<IEnumerable<ILogger>>();
Then:
然后：
var loggers = container.Resolve<IEnumerable<ILogger>>();
which gives you an IEnumerable.
它为您提供了一个 IEnumerable。
or 2) You can use the ImplicitCollectionSupport module, which will make the code work like newer versions of Autofac:
或 2) 您可以使用 ImplicitCollectionSupport 模块，这将使代码像较新版本的 Autofac 一样工作：
builder.RegisterModule(new ImplicitCollectionSupportModule());
builder.Register(component1).As<ILogger>;
builder.Register(component2).As<ILogger>;
Then resolve a collection of ILogger rather than looking for resolving all.
然后解析 ILogger 的一个集合，而不是寻找所有的解析。
var loggers = container.Resolve<IEnumerable<ILogger>>();
which gives you an IEnumerable, again.
这再次为您提供了一个 IEnumerable。
回答by Nicholas Blumhardt
An update for the sake of the new (2.x) version. All you need now is:
为了新的 (2.x) 版本而进行的更新。你现在需要的是：
container.Resolve<IEnumerable<I>>();
There's no longer a need for RegisterCollection()or ImplicitCollectionSupportModule- this functionality comes out of the box.
不再需要RegisterCollection()或ImplicitCollectionSupportModule- 此功能是开箱即用的。
