Autofac: Link from SingleInstance'd type to HttpRequestScoped
I have an application where a shared object needs an object reference to request.
Shared: Engine
|
Per Req: IExtensions ()
|
Request
If I try to type IExtensions
directly into the constructor Engine
, even how Lazy(Of IExtension)
, I get "The [Query] scoped mismatch is visible from the scope where the instance was queried." an exception when it tries to instantiate each IExtension
.
How do I instantiate HttpRequestScoped and then inject it into a shared instance?
Would it be considered good practice to set it to a Request
factory (and therefore inject it Engine
into RequestFactory
)?
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Due to general life requirements, Engine
you cannot inject extended query extensions into it. What you may have is a method or property in Engine that will actively resolve a collection of extensions from the current request scope.
So, first Engine
let's take the constructor dependency:
public class Engine
{
public Engine(..., Func<IExtensions> extensionsPerRequest)
{
_extensionsPerRequest = extensionsPerRequest;
}
public IExtensions Extensions
{
get { return _extensionsPerRequest(); }
}
}
And then in your Autofac registration:
builder.Register<Func<IExtensions>>(c => RequestContainer.Resolve<IExtensions>());
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