Multiple constructors - how to specify which one to use?

Hello and thank you for you efforts in developing and maintaining Grace! We’ve selected it as a candidate for replacing Ninject in our team project and I stumbled upon the following scenario which surprised me:

I have a setup in which there is a generic type with multiple constructors. I decorated the parameterless constructor with the [Import] attribute and expected that Grace would select that one which did not happen. You can see the test I wrote for the scenario:

public class Dependency { }

public class Service<T>
{
    [Import]
    public Service()
    {
        ParameterlessConstructorCalled = true;
    }

    public Service(T value)
    {
        Value = value;
    }

    public bool ParameterlessConstructorCalled { get; }
    public T Value { get; }
}

[Fact]
public void MultipleConstructors_DecorateSpecificConstructorWithImport_DecoratedConstructorUsed()
{
    var container = new DependencyInjectionContainer();

    var service = container.Locate<Service<Dependency>>();

    Assert.True(service.ParameterlessConstructorCalled);
}

Is that not how the Import attribute is supposed to work? Or how would you suggest to achieve that explicit constructor selection?

I tried adding the following configuration to the container as well but that didn’t work either:

container.Configure(c => c
    .Export(typeof(Service<>))
    .ImportConstructor(typeof(Service<>).GetConstructor(Type.EmptyTypes)));

I guess I could make this work by excluding the Dependency type from auto registration but I wouldn’t go that way due to the multiple types that are potentially passed to the generic.

[ipjohnson]

I’ll do a release in the next couple days and comment here when I do it

[bangiev]

Thank you!