Question

所以我有CardBase抽象类和我想提取一些随机卡元素排除一些特定的卡列表。所以我确实喜欢这个。

public List<CardBase> GetRandExclude(List<CardBase> list, int elementsCount, List<CardBase> excludeList)
{        
    var returnCards = from card in list
                               where !excludeList.Contains(card)
                               select card;
    foreach (CardBase cd in returnCards.Take(elementsCount))
    {
        Debug.Log("Selected random card is "+cd.name);
    }
    return (List<CardBase>) returnCards.Take(elementsCount);
}

我做对了吗？还有更好的方法吗？提前致谢。

所以我改变了一点。这似乎有效。

public List<CardBase> GetRandExclude(List<CardBase> list, int elementsCount, List<CardBase> excludeList)
{        
    var returnCards = from card in list
                               where !excludeList.Contains(card)
                               select card;
    foreach (CardBase cd in returnCards.OrderBy(arg => Guid.NewGuid()).Take(elementsCount).ToList())
    {
        Debug.Log("Selected random card is "+cd.name);
    }
    return returnCards.OrderBy(arg => Guid.NewGuid()).Take(elementsCount).ToList();
}

Answer 1

您可以使用Linq路线并使用Except提供CardBase进行某种形式的相等比较。另外，您可以使用重载并提供IEqualityComparer<CardBase> comparer

从那里你想从剩余的可用卡中随机选择卡片。

static Random randomizer = new Random();
public List<CardBase> GetRandExclude(List<CardBase> list, int elementsCount, List<CardBase> excludeList) {
    var availableCards = list.Except(excludeList).ToList();
    int count = Math.Min(elementsCount, availableCards.Count);
    var selectedCards = new HashSet<CardBase>();
    do{
        var index = randomizer.Next(0, availableCards.Count);
        var card = availableCards[index];
        selectedCards.Add(card);
    } while (selectedCards.Count < count);
    foreach (CardBase cd in selectedCards) {
        Debug.Log("Selected random card is " + cd.name);
    }
    return selectedCards.ToList();
}

Answer 2

您的代码会出现转换异常。

首先获取cardBase的IEnumerable。

然后使用ToList()

返回列表

 public List<CardBase> GetRandExclude(List<CardBase> list, int elementsCount, List<CardBase> excludeList)
        {
            var returnCards = from card in list
                              where !excludeList.Contains(card)
                              select card;
            foreach (CardBase cd in returnCards.Take(elementsCount))
            {
                //Debug.Log("Selected random card is " + cd.name);
            }
            IEnumerable<CardBase> newList = returnCards.Take(elementsCount);
            return newList.ToList();
        }

如何从列表中选择随机元素排除一些列表？

2 个答案: