Question

我有一个自定义Deck类，它继承了一个带有自定义Card类的List。

Deck的代码：

public class Deck : List<Card>
        {
            public void DrawCard(Deck d)
            {
                d.Add(this[0]);
                this.RemoveAt(0);
            }
            public Deck(bool deckHasCards)
            {
                if (deckHasCards)
                {
                    for (int i = 1; i <= 13; i++)
                    {
                        this.Add(new Card(i, Card.Suit.CLUBS));
                        this.Add(new Card(i, Card.Suit.DIAMONDS));
                        this.Add(new Card(i, Card.Suit.HEARTS));
                        this.Add(new Card(i, Card.Suit.SPADES));
                    }
                }
            }
            public void Shuffle()
            {
                Random rng = new Random();
                int n = this.Count;
                while (n > 1)
                {
                    n--;
                    int k = rng.Next(n + 1);
                    Card value = this[k];
                    this[k] = this[n];
                    this[n] = value;
                }
            }
        }

和Card：

public class Card
    {
        public Suit s { get; set; }
        public int num { get; set; }
        public enum Suit
        {
            HEARTS,
            DIAMONDS,
            CLUBS,
            SPADES
        }
        public Card(int number, Suit suit)
        {
            num = number;
            s = suit;
        }

        public override String ToString()
        {
            return num + " of " + s.ToString().ToLower();
        }
    }

一切都很好，但如果我想对Deck对象执行任何LINQ操作，我无法将其转换回Deck。有没有（正确的）方法去做这件事？

Answer 1

您可以向Deck添加新的构造函数：

public Deck(bool deckHasCards, IEnumerable<Card> cards)
{
    foreach (Card c in cards)
        this.Add(c);
}

并使用这样的一行：

var deck = new Deck(deckHasCards: true, cards: deck.Where(card => card.num == 2));

将继承的类转换为自定义类

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