C# 比较两个IEnumerable

我有两个Ienumerables。首先是排球、篮球、足球项目。 第二，游戏的完整历史。它都是字符串，因为我解析它的

public class Events
    {
        public string Date { get; set; }
        public string FirstTeam { get; set; }
        public string SecondTeam { get; set; }
    }

public class History
    {
        public string Date { get; set; }
        public string FirstTeam { get; set; }
        public string FirstTeamGoals { get; set; }
        public string SecondTeam { get; set; }
        public string SecondteamGoals { get; set; }
    }

我需要展示参加比赛的球队的前几场比赛。球队可以是前几场比赛中的第一队或第二队

我试试这个：

foreach (var teamInEvent in ListEvents)
            {
                var firstor = from p in History
                where p.FirstTeam == teamInEvent.FirstTeam || p.SecondTeam == teamInEvent.FirstTeam
                where p.SecondTeam == teamInEvent.SecondTeam || p.FirstTeam == teamInEvent.SecondTeam 
                select p;    
            }

---

因此，我需要显示日期、FirstTeam、FirstTeam目标、SecondTeam目标。比较进球并展示：球队在过去3场比赛中获胜（例如）。

如果我理解这个问题，“一线队”和“二线队”在语义上没有区别。如果是这种情况，您需要包括第一个团队被列为“第二个”的记录，反之亦然

IQueriable<History> GetHistory(Events teamInEvent)
{
    // Normal Query
    var firstQuery = 
    from h1 in History
    select h1 
    where h1.FirstTeam == teamInEvent.FirstTeam || 
          h1.SecondTeam == teamInEvent.SecondTeam;

    // Query with the first and the second team fields swapped
    var secondQuery = 
    from h2 in History
    select new History { Date = h2.Date, 
                         FirstTeam = h2.SecondTeam, 
                         FirstTeamGoals = h2.SecondTeamGoals, 
                         SecondTeam = h2.FirstTeam,
                         SecondTeamGoals = h2.FirstTeamGoals 
                       }
    where h2.FirstTeam == teamInEvent.SecondTeam || 
          h2.SecondTeam == teamInEvent.FirstTeam;


   // Stitch two queries together
   return firstQuery.Concat(secondQuery);
}

您可以通过计算所需的统计数据来处理历史，而不仅仅是存储历史数据

foreach (var teamInEvent in ListEvents)
{
    var history = GetHistory(teamInEvent);
    var stats   = ComputeStats(teamInEvent, history); 
    list.Add(Tuple.Create(teamEvent, stats));
}

---

您的

Date

属性的类型应为

DateTime

，您的

FirstTeamGoals

和

SecondteamGoals

的类型应为

int

（您将无法使用

字符串进行任何比较）
foreach (var teamInEvent in ListEvents)
{
    var history = GetHistory(teamInEvent);
    var stats   = ComputeStats(teamInEvent, history); 
    list.Add(Tuple.Create(teamEvent, stats));
}