如何將「SELECT col，COUNT（*）」轉換爲Linq表達式？

Question

我有這個疑問

SELECT Reaction, COUNT(*) as 'Votes' FROM Member_Reaction mr 
    WHERE mr.[Entitiy ID] = '259F16A0-9635-4F58-B645-0AEBAAC09D46' 
    GROUP BY Reaction 

我怎樣才能將它轉換爲LINQ的？

Answer 1

喜歡的東西：

var query = from item in db.MemberReactions 
      where item.ID == id 
      group item by item.Reaction into g 
      select new { Reaction = g.Key, Count = g.Count() }; 

（其中id就是你要找的ID - 作爲一個GUID，或字符串，或任何合適的類型。）