Question

我有一个包含玩家编号的课程......

public class Game {
    public int blackPlayer { get; set; }
    public int whitePlayer { get; set; }
}

和......

List<Game> games;

我想知道哪个玩家编号在列表中出现次数最多（无论他们是扮演黑人还是白人）。有谁知道一个好的LINQ表达式吗？

Answer 1

以下内容应该实现您的目标：

var q = (from g in games
        from p in new[] {g.blackPlayer, g.whitePlayer}
        group p by p into pgroup
        orderby pgroup.Count() descending
        select new { Player = pgroup.Key,  Count =  pgroup.Count() }).FirstOrDefault();


Console.WriteLine("Player # {0} played {1} times which is the most", q.Player,  q.Count);

Answer 2

如果你想要所有的关系。

List<int> mostFrequentPlayers = games.Select(g => g.blackPlayer)
  .Concat(games.Select(g => g.whitePlayer))
  .GroupBy(p => p) //into g
  .GroupBy(g => g.Count()) //into g2
  .OrderByDescending(g2 => g2.Key)
  .First()
  .SelectMany(g2 => g2, g => g.Key) //unpack g2 as g.Key
  .ToList();

确定玩过最多游戏的玩家

2 个答案: