LinQ Group By

• 普通

var list = from s in db.mm_ShopMas
                       where s.IsStop == false
                       group s by s.SpaceId;

　　　Sql執行時會取全部數據。

 

• into

var list = from s in db.mm_ShopMas
                       where s.IsStop == false
                       group s by s.SpaceId into g
                       select g;

　　Sql執行時會取全部數據。

　　Select
　　

var list = from s in db.mm_ShopMas
                       where s.IsStop == false
                       group s by s.SpaceId into g
                       select new { g.Key,Total = g.Count()};

 

　　Sql執行的結果為匯總數據。

• 多列Group

var list = from s in db.mm_ShopMas
                       where s.IsStop == false
                       group s by new { s.SpaceId ,s.TradeId} into g
                       select new { g.Key, Total = g.Count() };

　　Sql執行結果為匯總數據。

　select new {g.Key.TradeId,g.Key.SpaceId,Tocal=g.Count()}

　

select new {g.Key,Tocal=g.Count()}

• 表達式

 

var list = from s in db.mm_ShopMas
                       where s.IsStop == false
                       group s by new { IdFirst = s.ShopId / 1000 } into g
                       select new { g.Key, Total = g.Count() };

Sql執行結果為匯總數據：