如何在EF中分組數據兩次？

Question

這是我目前的LINQ查詢：

  var list_1 = from z in _uow.Events.FindAll() 
        group z by new 
            { 
             z.GroupOfEvents.Customer, 
             z.GroupOfEvents.GroupOfGroupOfEvents.Data.Year, 
             z.GroupOfEvents.GroupOfGroupOfEvents.Data.Month, 
             z.GroupOfEvents.GroupOfGroupOfEvents.Data.Day 
            } 
         into zz 
         select new 
            { 
             zz.Key.Customer.Id, 
             zz.Key.Year, 
             zz.Key.Month, 
             zz.Key.Day, 
             Amount = zz.Sum(a => a.Amount) 
            }; 

我想獲得的客戶ID分組數據，然後通過天（年 - 月 - 日）。所以我想每個客戶每天訪問特定的「金額」。任何想法如何做到這一點？

Answer 1

到目前爲止，我來了這個，但我不知道這是最好的方式嗎？

  var list_a = 
      from klient in _uow.Klient.FindAll() 
      select 
       new 
        { 
         Klient = klient, 
         Days = 
       from grupaZdarzen in klient.GrupaZdarzen 
       group grupaZdarzen by new 
              { 
               grupaZdarzen.ZestawGrupZdarzen.Data.Year, 
               grupaZdarzen.ZestawGrupZdarzen.Data.Month, 
               grupaZdarzen.ZestawGrupZdarzen.Data.Day 
              } 
       into grupyZdarzenByDay 
       select new 
          { 
           Data = grupyZdarzenByDay.Key, 
           Total = 
        (from grupaZdarzenByDay in grupyZdarzenByDay 
        from zdarzeniaByGrupa in grupaZdarzenByDay.Zdarzenie 
        select zdarzeniaByGrupa.Ilosc).Sum() 
          } 
        }; 

     var list_b = list_a.ToDictionary(a => a.Klient.Id, 
             a => 
             a.Days.ToDictionary(
              b => b.Data.Day + "/" + b.Data.Month + "/" + b.Data.Year, b => b.Total));