Ninject InRequestScope fallback to InThreadScope

Question

In my MVC3 project I've setup my kernel to Ninject the Entityframework context on a InRequestScope basis, this works perfect. But I have a background runner that does some workflow management.

It fires up a new thread each 5 minutes and I Ninject my dependencies into this thread, If I change the scope to InThreadScope the Dispose method is fired, but If I change it back to InRequestScope the Dispose method won't fire.

Is there a way of fallbacking to InThreadScope if InRequestScope isn't available?

Update: Just got an upvote for this question and why not update it with some additional info. I think that Ninjects way of handling life time is a bit outdated. Other IoC's have child containers were Transient registered objects live during the whole child container and are disposed when the child containers are. This is a much easier way of combining for example Web API with a custom worker like above scenario.

Answer 1

There's an InScope method, with which you can specify a custom scoping rule.

The implementation of InRequestScope is currently undergoing change from 2.2-2.4.

So go to the source of your version, look at the impl of InRequestScope and InThreadScope and create an amalgam (which you can then slot in as an extension method alongside the other InXXXScope methods.

It'll look (before you extract it into an extension method) something like:

Bind<X>.To<T>().InScope( ctx => ScopeContext.Request(ctx) ?? ScopeContext.Thread(ctx))

The other way is to create two Bindings, with an appropriate constraint such as WhenInjectedInto<T> to customize the scoping based on the contextual binding.