LINQ有两个列表谓词

Question

我有一个这样的代码:

string[] teamNames = teams.Select(x => x.Name).ToArray();
List<int> wins = new List<int>();
foreach(var _team in teamNames)
{
    wins.Add(matches.Count(x => 
        ((x.Team1 == _team && x.Maps.Count(map => map.Score1 > map.Score2) > x.Maps.Count(map => map.Score2 > map.Score1)) || 
        (x.Team2 == _team && x.Maps.Count(map => map.Score2 > map.Score1) > x.Maps.Count(map => map.Score1 > map.Score2))
        )));
}

我想知道你是否可以在没有foreach的情况下计算每个球队的胜利，因为foreach只是一个接一个地显示球队的名字。有什么想法吗/

Answer 1

您应该能够通过用Select替换foreach来做到这一点:

var wins = teamNames
    .Select(_team =>
        matches.Count(x => 
        ((x.Team1 == _team && x.Maps.Count(map => map.Score1 > map.Score2) > x.Maps.Count(map => map.Score2 > map.Score1)) || 
        (x.Team2 == _team && x.Maps.Count(map => map.Score2 > map.Score1) > x.Maps.Count(map => map.Score1 > map.Score2))
        ))
    )
.ToArray();

Answer 2

您也可以直接在比赛中使用groupby，而不需要创建teamNames。