Caliburn.Micro.使用Autofac自动为IHandle实现者调用eventaggregator.Subscribe()

问题描述

在 Caliburn.Micro 文档中，作者提到了这种可能性:

In Caliburn.Micro documentation the authors mention such possibility:

文档链接

如何用Autofac做到这一点?

How is it possible to achieve this with Autofac?

我尝试利用装饰器的功能，但是对于这种情况当然是不合适的.而且，默认情况下，我的 IHandle<> 的实现者不会在容器中注册为 IHandle 的实例.

I tried to utilize the features of decorator, but of course it's kinda improper for this case. More over, by default my implementors of IHandle<> are not getting registered as instances of IHandle within the container.

PsS .提供此不当的实施方式是为了以防万一，尽管我对此表示怀疑.

P.S. Providing this improper implementation just in case it might be of any use, though I doubt.

builder.RegisterInstance<IEventAggregator>(new EventAggregator());
builder.RegisterDecorator<IHandle>((container, handler) =>
{
    var eventAggregator = container.Resolve<IEventAggregator>();
    eventAggregator.Subscribe(handler);
    return handler;
}, "unsubscribed", "subscribed");

推荐答案

对Caliburn的工作原理做一些假设，我认为您正在寻找的是:

Making a few assumptions about how Caliburn works, I think what you're looking for is:

builder.RegisterType<MyViewModel>();
builder.RegisterModule<AutoSubscribeHandlersModule>();

模块的实现方式如下:

class AutoSubscribeHandersModule : Module
{
    protected override AttachToComponentRegistration(
        IComponentRegistry registry,
        IComponentRegistration registration)
    {
        if (typeof(IHandle).IsAssignableFrom(registration.Activator.LimitType))
        {
            registration.Activated += (sender, e) => {
                var aggregator = e.Context.Resolve<IEventAggregator>();
                aggregator.Subscribe((IHandle)e.Instance);
            };
        }
    }
}

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