c# - 在 Entity Framework 查询中使用带有标志的枚举

我有一个如下的枚举类型

  [Flags]
    public enum WeekDays
    {

        Monday = 1,
        Tuesday = 2,
        Wednesday = 4,
        Thursday = 8,
        Friday = 16,
        Saturday = 32,
        Sunday = 64,
    }


   WeekDays dw = WeekDays.Friday | WeekDays.Monday | WeekDays.Saturday;

   int dwInt = (int)dw;

   var list = query.Where(f => f.FromDateTime.DayOfWeek == dwInt "??????????? what can i do there????").ToList();

最佳答案

从Entity Framework 6.1开始，您可以在请求中使用HasFlag扩展方法。

例如:

query.Where(f => f.FromDateTime.DayOfWeek.HasFlag(WeekDays.Friday | WeekDays.Monday)).ToList();

有关功能请求和实现的详细信息，请参见https://entityframework.codeplex.com/workitem/1497。