什么是" ForwardedTypes"在温莎城堡组件注册的情况下？ [英] What are "ForwardedTypes" in the context of Castle Windsor component registration?

问题描述

为题说，真的！他们会怎么做？

As the subject says, really! What do they do?

推荐答案

转发类型让你有一个单一的实现来实现多个服务，对于一个具体的例子说我们有两个接口，用于与某种树节点工作：

Forwarded types allow you to have more than one service implemented by a single implementation, for a concrete example say we have two interfaces for working with tree nodes of some sort:

public interface INodeAlterationProvider { ... }
public interface IChildNodeListProvider { ... }

和各种组件需要在一个或两个这些接口的依赖。然而，在实施每一个这些接口的你会发现，他们是一个很大的共享功能，并希望将实现合并成一个单一类的一些其他功能一起​​说这样的：

And various components take a dependency on one or both of those interfaces. However in implementing each of those interfaces you discover that their is a lot of shared functionality and want to merge the implementations into a single class along with some other features say like:

public class NodeFactory : INodeAlterationProvider, IChildNodeListProvider { ... }

你可以注册NodeFactory，一两个实例，因为他们实现每个服务：

You could register two instances of NodeFactory, one for each service they implement:

container.Register(Component.For<INodeAlterationProvider>().ImplementedBy<NodeFactory>());
container.Register(Component.For<IChildNodeListProvider>().ImplementedBy<NodeFactory>());

但是，这可能意味着NodeFactory两个单实例存在 - 不理想，尤其是如果它是昂贵的构建 - 并且可以使调试等更难理解，尤其是如果有正在实施两个以上的接口

But this could potentially mean two singleton instances of NodeFactory exist - not ideal, especially if it's costly to construct - and can make debugging etc. harder to understand, especially if there was more than two interfaces being implemented.

这就是转发类型的一步，让您在多个转发相同的实施服务，这里就是这样做的例子：

This is where forwarded types step in, allowing you to forward multiple services to the same implementation, here's an example of doing that:

container.Register(Component.For<INodeAlterationProvider>().Forward<IChildNodeListProvider>().ImplementedBy<NodeFactory>());

请注意：这里显示的组件注册代码只能在主干可用

Note: the component registration code shown here is only available on trunk.

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