DataTable/Array Linq查询,groupby

DataTable Linq查询

1.查询DataRow

 IEnumerable<DataRow> q1 = from r in dt.AsEnumerable()
                                       where r.Field<int>("ID") %  ==
                                       select r;

2.查询某个字段

 var query2 =
         from pl in dt.AsEnumerable( )
         select pl.Field<string>("Name");

3.group by

             var query = from r in dt.AsEnumerable()
                        group r by new { r1 = r.Field<int>("lcm_tap_id") } into m
                        select new { tap_id = m.Key.r1 };
             if (query.ToList().Count > )
             {
                 query.ToList().ForEach(q =>
                     {
                         sbSdId.Append(q.tap_id + ",");
                     });
             }

Array Linq查询

 int[] values = { ,,,,,,,,,};
             var filtered =
                 from value in values
                 where value >
                 select value;