C＃Linq Group By在多个列上[重复]

简单：

var consolidatedChildren =    from c in children    group c by new    {        c.School,        c.Friend,        c.FavoriteColor,    } into gcs    select new ConsolidatedChild()    {        School = gcs.Key.School,        Friend = gcs.Key.Friend,        FavoriteColor = gcs.Key.FavoriteColor,        Children = gcs.ToList(),    };

var consolidatedChildren =    children        .GroupBy(c => new        { c.School, c.Friend, c.FavoriteColor,        })        .Select(gcs => new ConsolidatedChild()        { School = gcs.Key.School, Friend = gcs.Key.Friend, FavoriteColor = gcs.Key.FavoriteColor, Children = gcs.ToList(),        });