c# - LINQ 中的 For 循环等价物

Question

我是 LINQ 的新手。

playerData是一个list<DataAccess.Team>，我想playerViewModelList用来自 的数据初始化另一个列表playerData。

我试过了foreach。

 foreach (DataAccess.Team dataTeam in playerData)
 {
     playerViewModelList.Add(new PlayersViewModel
     {
         PicPath = dataTeam.Tied.ToString(),
         PlayerID = (int)dataTeam.ID,
         PlayerName = dataTeam.TeamName
     });
  }

是否可以使用 LINQ 实现相同的目标？

Answer 1

Select在这种情况下是等价的：

playerViewModelList = playerData.Select(dataTeam => new PlayersViewModel
                                        {
                                            PicPath = dataTeam.Tied.ToString(),
                                            PlayerID = (int)dataTeam.ID,
                                            PlayerName = dataTeam.TeamName
                                        }).ToList();

当然，这假设playerViewModelList是一个List<PlayersViewModel>或类似的东西。如果你不能覆盖playerViewModelList，就坚持foreach循环。

Answer 2

playerData.ForEach(d => playerViewModelList.Add(new PlayersViewModel {
    PicPath = d.Tied.ToString(),
    PlayerID = (int)d.ID,
    PlayerName = d.TeamName
}));

或者

playerViewModelList.AddRange(playerData.Select(d => new PlayersViewModel {
    PicPath = d.Tied.ToString(),
    PlayerID = (int)d.ID,
    PlayerName = d.TeamName
}));

Answer 3

或者，正如您List<>在双方所拥有的那样：

  playerViewModelList = playerData.ConvertAll(dataTeam => new PlayersViewModel
  {
    PicPath = dataTeam.Tied.ToString(),
    PlayerID = (int)dataTeam.ID,
    PlayerName = dataTeam.TeamName
  });