Is there any way to make each class that implements interface Ae has a List of one of the concrete classes that implement Ba as property?

Question

• I have an interface (Ae) that has a list of objects (List) from another interface (Ba).
• I have a class that implements interface Ae.
• I have several classes that implement the Ba interface.

Is there any way to make each class that implements interface Ae has a List of one of the concrete classes that implement Ba as property?

public interface IQuestion
{
    IAnswerOption[] Answers { get; set; }
}

public interface IAnswerOption
{
    int Id { get; }
    bool IsCorrect { get; set; }
}

public class AnswerOptionText : IAnswerOption
{
    public int Id { get; }
    public bool isCorrect;
    public string ansText;
}

public class AnswerOptionImage : IAnswerOption
{
    public int Id { get; }
    public bool isCorrect;
    public string imgSlug;
}

public class AudioQuestion : IQuestion
{
    public AnswerOptionImage[] Answers;
    public string audioName;
}

public class TextQuestion : IQuestion
{
    public AnswerOptionText[] Answers { get; set; }
    public string questionText { get; set; }
}

When I try it, AudioQuestion and TextQuestion doesn't allow me to use AnswerOptionImage[] and AnswerOptionText[] respectively.

Visual Studio says that I need to implement interface member IQuestion.Answers, but this is not what I intend.

If someone can help me I would be very grateful. Thanks.

Answer 1

It seems that using generics for your IQuestion interface will be a good fit:

public interface IQuestion<T> where T: IAnswerOption
{
    T[] Answers { get; set; }
}

public class AudioQuestion : IQuestion<AnswerOptionImage>
{
    public AnswerOptionImage[] Answers{ get; set; }
    public string audioName;
}

public class TextQuestion : IQuestion<AnswerOptionText>
{
    public AnswerOptionText[] Answers { get; set; }
    public string questionText { get; set; }
}