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MEF Error message

Answer 1

+1 A:

It's looking for something like this:

[Export]
public class ApplicationServicesManager
{
}

or like this:

public class SomeClass
{
    [Export]
    public ApplicationServicesManager AppServices { get; private set; }
}

But it can't find one in the scope of your provided exports. If you're Exporting it from a property or field, make sure the object exporting it has been composed with the container. If it's a class export and the class is present in another assembly, make sure the assembly is in the container's catalog.

Dan Bryant 2010-05-14 22:28:16

I'm using Silverlight 4.0 so I'm not dealing with catalog's, rather I am using the suggested method:CompositionInitializer.SatisfyImports(this);

cmaduro 2010-05-14 22:31:04

BTW That still does not solve my problem, as I have exported the ApplicationServicesManager. It's a class in another assembly, but is it included in the xap file, so it should resolve.

cmaduro 2010-05-14 22:46:40

SatisfyImports will use an implicitly created global container with a standard catalog, but it should hopefully be set up to use every assembly in the XAP to look for exports; I haven't used MEF with Silverlight, so I'm not entirely sure. In any case, the error is definitely a failure to resolve the Export. I've seen this problem when my class exporting a service as a property wasn't properly composed in the container I was using.

Dan Bryant 2010-05-14 23:02:10

Answer 2

A:

While the ApplicationServicesManager class may be available and marked with an [Export] attribute, this part may still have been rejected because it has itself imports which cannot be satisfied.

Take a look at the section Diagnosing Composition problems in the MEF documentation.

Wim Coenen 2010-05-21 00:25:53

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