AutoFixture：冻结运行时类型不会引发公共构造函数错误

Question

My brain is fried at this point so apologies if this is a silly one:

I'm attempting to gather all types implementing an interface type at runtime using reflection and have AutoFixture create instances of them. Some of them have no parameterless ctor.

As a result, I'm doing a

public static IEnumerable<T> GetTypesWithInterface<T>() where T : class
{
    var iType = typeof(T);
    return iType.Assembly.GetLoadableTypes() //another method which does as it's namesake implies
    .Where(type => iType.IsAssignableFrom(type) && !type.IsInterface)
    .Select(t => FormatterServices.GetUninitializedObject(t) as T)
    .ToList();
}

And elsewhere calling the code with a:

protected List<T> AutoCreateSpecimenWithFixture<T>() where T : class
{
        return TypeLoaderExtensions.GetTypesWithInterface<T>()
        .Select(t => new SpecimenContext(Fixture).Resolve(t))
        // .Select(t => Fixture.Create(t, specimen))
        .Cast<T>()
        .ToList();
}

Before this is called, my Fixture is a:

 protected UnitTest()
{
    Fixture = new Fixture();
    Fixture.Customize(new AutoMoqCustomization());
    CustomRegistrations();
}

private void CustomRegistrations()
{
    _settingsServiceMock ??= Fixture.Freeze<Mock<ISettingsService>>();

    Fixture.Register(() =>
        new OverrideRule(_settingsServiceMock.Object));
}

I've toyed with Freeze/Inject/Register above, with no joy. In my actual integration tests, doing:

var kek = Fixture.Create<OverrideRule>(); //works
_rules = AutoCreateSpecimenWithFixture<IRule>(); //throws no public ctor error :/

I've also looked at these but haven't gotten them to work yet as per the AutoCreateSpecimenWithFixture method:

AutoFixture: how to CreateAnonymous from a System.Type

AutoFixture: Unable to create an instance, probably no public constructor

Any help would be appreciated please and thank you.

Answer 1

I googled around some blogs and it looked like my seeds were being ignored, hence having to re-write my block to new up a seed as:

return TypeLoaderExtensions.GetTypesWithInterface<T>()
    .Select(t => new SpecimenContext(Fixture)
        .Resolve(new SeededRequest(t, null)) as T)
    .ToList();