1
当摆弄这个时我无法获得语法权限。删除后,我只需要UserIds列表。获取某个字段的列表返回
List<int> unselectedHockeyPlayers = allHockeyPlayers.Where(u => hockeyPlayers.Contains(u.UserId)).ToList());
当摆弄这个时我无法获得语法权限。删除后,我只需要UserIds列表。获取某个字段的列表返回
List<int> unselectedHockeyPlayers = allHockeyPlayers.Where(u => hockeyPlayers.Contains(u.UserId)).ToList());
您错过了对UserId
s的预测。
List<int> unselectedHockeyPlayers = allHockeyPlayers
.Where(u => !hockeyPlayers.Contains(u.UserId))
.Select(u => u.UserId)
.ToList()
或者更简洁地说,
List<int> unselectedHockeyPlayers = allHockeyPlayers
.Select(u => u.UserId)
.Except(hockeyPlayers)
.ToList();
的ToList()必须是在末端。
List<int> unselectedHockeyPlayers = allHockeyPlayers.Where(u => hockeyPlayers.Contains(u.UserId))).Select(u => u.UserId).ToList();
编辑:你也必须具体选择你想使用.Select()子句的字段。否则,你会得到一个列表