Func injecting with Windsor container

问题:

Here is a code excerpt from AspComet project that works with Autofac.

public MessageBus(IClientRepository clientRepository, Func<IMessagesProcessor> messagesProcessorFactoryMethod)
{
    this.clientRepository = clientRepository;
    this.messagesProcessorFactoryMethod = messagesProcessorFactoryMethod;
}

How can I inject "Func<IMessagesProcessor> messagesProcessorFactoryMethod" with Windsor, is it possible?

Thanks.

回答1:

container.Register(Component.For<Func<Foo>>().Instance(f));

Here's a passing unit test that demonstrates the concept:

[TestMethod]
public void Test2()
{
    Func<string> f = () => "Hello world";

    var container = new WindsorContainer();
    container.Register(Component.For<Func<string>>().Instance(f));

    var resolvedFunc = container.Resolve<Func<string>>();

    Assert.AreEqual("Hello world", f());
}

回答2:

Container.Register(
  Component.For<IMessagesProcessor>()
           .ImplementedBy<MessagesProcessor>()
           .Lifetime.Transient,
  Component.For<Func<IMessagesProcessor>>()
           .Instance(() => Container.Resolve<IMessagesProcessor>())
)

That should do the trick

回答3:

Castle.Windsor 2.5+ comes with delegate-based factories support which allows it to resolve a delegate for you without any explicit registration.