Is it possible to parameterize a MEF import?
- by Josh Einstein
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.
