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MEF registered types with dependencies on non MEF registered types doesn't work
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Shandem  
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 More options Nov 25 2010, 1:51 am
From: Shandem <sdemin...@gmail.com>
Date: Wed, 24 Nov 2010 22:51:01 -0800 (PST)
Local: Thurs, Nov 25 2010 1:51 am
Subject: MEF registered types with dependencies on non MEF registered types doesn't work
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Hi,

Say i have an object in my main DLL:

TestData

then i register this type in my container:
builder.RegisterType<TestData>()

Say i have an object in my plugins DLL:

[Export]
public class MyObject {
   public MyObject(TestData testData) {...}

}

then i register my plugins DLL:
var catalog = new DirectoryCatalog(m_HttpServer.MapPath("~/Plugins/
Stuff"));
builder.RegisterComposablePartCatalog(catalog);

when i resolve MyObject, it tells me that:

The request service 'ContractName=TestData' has not been registered.

I've looked in the source of Autofac and it appears as though
ComponentsForContract it checks if components are registered using the
RegistrationsFor method. Inside of that method, it ONLY looks for
services that are of type:
ContractBasedService

Unfortunately, the TestData service isn't registered as a
ContractBased service and only as a TypedService because it wasn't
registered using the MEF extensions.

A 'workaround' which does work is to register my test service 2 times
and mark it with an Export attribute:

builder.RegisterType<TestData>()
builder.RegisterComposablePartType(typeof(TestData));

This DOES work but is not really ideal.

Is there any reason why Autofac forces the search for dependencies on
MEF components to be ContractBasedService ?


 
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Nicholas Blumhardt  
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 More options Nov 25 2010, 4:33 pm
From: Nicholas Blumhardt <nicholas.blumha...@gmail.com>
Date: Fri, 26 Nov 2010 07:33:57 +1000
Local: Thurs, Nov 25 2010 4:33 pm
Subject: Re: MEF registered types with dependencies on non MEF registered types doesn't work
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Hi Shandem,

You need to mark the TestData type:

builder.RegisterType<TestData>()
    .Exported(x => x.As<TestData>());

There are differences between the way MEF and Autofac handle service
contracts that make this necessary for a correct integration. Given that the
exported types form the "public" extensibility API of your application, it
is probably not a bad idea to select them explicitly anyway.

Cheers,
Nick

On 25 November 2010 16:51, Shandem <sdemin...@gmail.com> wrote:


 
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Shandem  
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 More options Nov 25 2010, 8:38 pm
From: Shandem <sdemin...@gmail.com>
Date: Thu, 25 Nov 2010 17:38:42 -0800 (PST)
Local: Thurs, Nov 25 2010 8:38 pm
Subject: Re: MEF registered types with dependencies on non MEF registered types doesn't work
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Ok great, but if i register TestData like the above, will it be able
to be injected into non-MEF dependencies as well?

Thanks,
Shannon

On Nov 26, 8:33 am, Nicholas Blumhardt <nicholas.blumha...@gmail.com>
wrote:


 
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Nicholas Blumhardt  
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 More options Nov 25 2010, 10:03 pm
From: Nicholas Blumhardt <nicholas.blumha...@gmail.com>
Date: Fri, 26 Nov 2010 13:03:41 +1000
Local: Thurs, Nov 25 2010 10:03 pm
Subject: Re: MEF registered types with dependencies on non MEF registered types doesn't work
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Yes.

Cheers,
Nick

On 26 November 2010 11:38, Shandem <sdemin...@gmail.com> wrote:


 
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Shandem  
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 More options Nov 25 2010, 11:41 pm
From: Shandem <sdemin...@gmail.com>
Date: Thu, 25 Nov 2010 20:41:20 -0800 (PST)
Local: Thurs, Nov 25 2010 11:41 pm
Subject: Re: MEF registered types with dependencies on non MEF registered types doesn't work
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Amazing. thanks for the tip, works perfectly!

On Nov 26, 2:03 pm, Nicholas Blumhardt <nicholas.blumha...@gmail.com>
wrote:


 
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