group by分组带where的问题
数据如下：
var stationIDs = new List<int> { 1, 2, 3, 4 };

var stations = new List<Station>
{
new Station{ StationID=1, Type=0},
new Station{ StationID=2, Type=1},
new Station{ StationID=3, Type=1},
new Station{ StationID=4, Type=1},
new Station{ StationID=2, Type=0},
new Station{ StationID=1, Type=0}
};

查询stations当中type=0，stationID包含stationIDs，按stationID分组，求出结果集：

StationID,Count
1 ,2
2 ,1

谁帮忙写个比较简洁又高效的语句，谢谢！


[解决办法]

C# code

static void Main(string[] args)        {            var stationIDs = new List<int> { 1, 2, 3, 4 };            var stations = new List<Station>{                new Station{ StationID=1, Type=0},                new Station{ StationID=2, Type=1},                new Station{ StationID=3, Type=1},                new Station{ StationID=4, Type=1},                new Station{ StationID=2, Type=0},                new Station{ StationID=1, Type=0}            };            var result = from c in stationIDs                          join o in                              from c in stations                              where c.Type == 0                              select c on c equals o.StationID into ords                          select new                          {                              c,                              count = ords.Count()                          };                                     foreach (var item in result)            {                Console.WriteLine("{0}", item);            }            Console.Read();        }