使用Simple Injector的等效Ninject代码

Question

Decided to switch from Ninject to Simple Injector and one problem i'm having here is trying to convert this code into Simple Injectors Equivalent:

var resolver = new SomeResolver(container); 

container.Rebind(typeof(IHubConnectionContext<dynamic>))
    .ToMethod(context =>
        resolver.Resolve<IConnectionManager>().GetHubContext<PlanHub>().Clients
    ).WhenInjectedInto<PlanHubService>();

Answer 1

• The use of Rebind in Ninject is equivalent to using Register with AllowOverridingRegistrations set to true in Simple Injector.
• WhenInjectedInto in Ninject is equivalent to the use of RegisterConditional in Simple Injector.
• The ToMethod in Ninject typically equals to using Register<T>(Func<T>) in Simple Injector, but in conjunction with RegisterConditional you will have to fall back to creating a Registration using Lifestyle.CreateRegistration<T>(Func<T>, Container) .

You can therefore rewrite your binding to the following Simple Injector code:

container.RegisterConditional(
    typeof(IHubConnectionContext<dynamic>),
    Lifestyle.Transient.CreateRegistration(
        () => container.GetInstance<IConnectionManager>().GetHubContext<PlanHub>().Clients,
        container),
    WhenInjectedInto<PlanHubService>);

Where WhenInjectedInto<T> is a custom helper method defined as follows:

private static bool WhenInjectedInto<T>(PredicateContext context) =>
    typeof(T).IsAssignableFrom(context.Consumer.ImplementationType);