如何在 C# 中拥有多个派生类型的单个数据集合？

Question

I'm not sure if I phrased my question appropriately, but consider the following scenario:

I have an abstract class called Card . The Card class contains many members. I have two classes that derive from Card called BlueCard and RedCard . To visualize this:

public abstract class Card{
    //many members
}

public class BlueCard : Card{
    //many members
}

 public class RedCard : Card{
    //many members
}

Now, suppose I have a class Deck . Deck needs to contain a single array of both BlueCard and RedCard . Is there a way to go about this?

Answer 1

I'm using this approach in a similar situation myself, where an ElementGroup object contains a collection of objects that are either of type Element or of a type deriving from Element. I think something like this should suit your case:

public class Deck {
    public Deck() {
        _cardArray = new Card[52];
    }

    private Card[] _cardArray;

    public void DrawCard(int cardNumber) {
        var card = _cardArray[cardNumber];
        if (card.GetType() == typeof(Card)) {
            // Do something
        }
        else if (card.GetType() == typeof(BlueCard)) {
            // Do something
        }
        else if (card.GetType() == typeof(RedCard)) {
            // Do something
        }
    }
}