對LINQ表達式的SQL查詢

如何將此SQL查詢轉換爲LINQ表達式？對LINQ表達式的SQL查詢

select NoteDate, SUM(DurationInHours) from Note 
where IDUser = '2933FB9C-CC61-46DA-916D-57B0D5EF4803' and 
     NoteDate > '2013-07-01' 
group by NoteDate

我嘗試過，但沒有奏效

var lastMonth = DateTime.Today.AddMonths(-1); 
var userNotes = GetNotesByUser(idUser); 
var b = from note in userNotes 
     group note by new {note.IDUser, note.NoteDate, note.DurationInHours} into g 
     where g.Key.NoteDate > lastMonth 
     select new {g.Key.NoteDate, TotalHours = g.Sum(a => a.DurationInHours)}

來源

2013-07-31 gog

那你試試？ – algreat

這是學習LINQ查詢的好地方。 http://code.msdn.microsoft.com/101-LINQ-Samples-3fb9811b –

var lastMonth = DateTime.Today.AddMonths（-1）; var userNotes = GetNotesByUser（idUser）; VAR B =從音符在userNotes 組通過新的{note.IDUser，note.NoteDate，note.DurationInHours} 注入克其中g.Key.NoteDate> lastMonth 選擇新的{g.Key.NoteDate，TotalHours = g.Sum（a => a.DurationInHours）} 我試過了，但沒有工作。我看到這個例子@CamBruce，但我有一些緊迫感。我用更多的時間研究它！謝謝。 – gog

var id = new Guid("2933FB9C-CC61-46DA-916D-57B0D5EF4803"); 
var date = new DateTime(2013, 7, 1); 

var query = from n in db.Notes 
      where n.IDUser == id && n.NoteDate > date 
      group n by n.NoteDate into g 
      select new { 
       NoteDate = g.Key, 
       Sum = g.Sum(x => x.DurationInHours) 
      };

來源

2013-07-31 20:25:34

對LINQ表達式的SQL查詢

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