I am relatively new to MEF so I don't fully understand the capabilities. I'm trying to achieve something similar to Unity's InjectionMember.

Let's say I have a class that imports MEF parts. For the sake of simplicity, let's take the following class as an example of the exported part.

[Export]
[PartCreationPolicy(CreationPolicy.NonShared)]
public class Logger {

    public string Category {
        get;
        set;
    }

    public void Write(string text) {
    }

}

public class MyViewModel {

    [Import]
    public Logger Log {
        get;
        set;
    }

}

Now what I'm trying to figure out is if it's possible to specify a value for the Category property at the import. Something like:

public class MyViewModel {

    [MyImportAttribute(Category="MyCategory")]
    public Logger Log {
        get;
        set;
    }

}

public class MyOtherViewModel {

    [MyImportAttribute(Category="MyOtherCategory")]
    public Logger Log {
        get;
        set;
    }

}

For the time being, what I'm doing is implementing IPartImportsSatisfiedNotification and setting the Category in code. But obviously I would rather keep everything neatly in one place.