从对象列表中获取对象

Question

我有一个Team对象列表，Team的一个属性是Player对象列表。

我想从具有特定ID的团队中获取具有特定ID的玩家，例如：

Get the player with ID (player.id) 123 from the Team with ID 987 (team.id)

如何使用LINQ执行此操作？

非常感谢，鲍勃

Answer 1

var team = teams.FirstOrDefault(teams => teams.ID == 987);
if(team != null) {
    var result = team.Players.FirstOrDefault(player => player.ID == 123);
}

Answer 2

相当简单，但

var list = new List<Team>();
var playerInTeam = list.FirstOrDefault(t=>t.Id==987).Players.FirstOrDefault(p=>p.Id==123);

或者，更一般的解决方案：

public Player GetPlayerInTeam(int playerId, int teamId, IEnumerable<Team> teams)
{
    return teams.First(t=>t.Id==teamId).Players.First(p=>p.Id==playerId);
}

Answer 3

var teams = new List<team>();
var player_team=teams.First(a=>a.id==987).players.First(b=>b.id==123);