將SQL轉換爲LINQ

Question

如何將以下SQL語句轉換爲C＃中的LINQ語句？

select BLDG_CODE, count(ROOM) "Number of Rooms" 
from LOCATION 
group by BLDG_CODE; 

非常感謝您

Answer 1

var query = from l in Locations 
      group l by l.BLDG_CODE into g 
      select new { 
       BLGD_CODE = g.Key, 
       NumberOfRooms = g.Count() 
      }; 

Answer 2

或者，如果你願意方法語法...

var query = Locations.GroupBy(location => location.BLDG_CODE) 
        .Select(group => new { 
              BuildingCode = group.Key, 
              NumberOfRooms = group.Count() 
              });