Container.cs

public class Container
{
    Dictionary<Type, Func<Container, object>> factory;
    public Container()
    {
        factory = new Dictionary<Type, Func<Container, object>>();
    }
    
    public void Register<TReferenceType, TObjectType>(Func<Container, TObjectType> creator = null)
        where TObjectType : TReferenceType
    {
        if (creator == null) creator = c => (TObjectType)Activator.CreateInstance(typeof(TObjectType));
        factory.Add(typeof(TReferenceType), c => creator.Invoke(c));
    }

    public object Create(Type type) => factory[type]?.Invoke(this);
    public TReferenceType Create<TReferenceType>() => (TReferenceType)Create(typeof(TReferenceType));

    static Lazy<Container> instance = new Lazy<Container>();
    public static Container Instance => instance.Value;
}