Linq to sql 迭代器bug？

            DataClassesDataContext dcd = new DataClassesDataContext();
            var msgs = (from msg in dcd.SK_Messages where msg.MsgStatus == 0 select msg).Take(20);
            foreach (var msg1 in msgs)
            {
                ...               
            }

            msgs.GetEnumerator().Reset();

            foreach (var msg1 in msgs)
            {
   
            ...

            }

连续写两个foreach循环，第二个循环的执行次数为零