依赖注入ActionFilterAttribute替代

Question

Is there an elegant way to implement the following in a ActionFilterAttribute .

_provider = new DetailsProvider(new DetailsService(new CachingService()))

As you can see this does not look good. What I want to get away from, is 'newing' up these concrete classes.

Is there a nice alternative?

Answer 1

I solved this using

public HandlerAttribute() :
        this(DependencyResolver.Current.GetService<IDetailsProvider>()) { }

public HandlerAttribute(IDetailsProvider detailsProvider)
{
    _detailsProvider = detailsProvider;
}

I am using SimpleInjector but this is interchangeable as I am using a Resolver.

You can just use whatever containers, get instance of concrete class using interface method.