結果與總和時間跨度，羣組以及加入

Question

我下面的EF模型：

我想在下面的視圖數據：

數據實體時間是毫秒的時間跨度。結果，PlaceInStep由StepId之間的成員之間。

如何使這個硬查詢？

編輯1：

我的一些代碼：首先

var query = from data in ctx.Data 
          join member in ctx.Members 
          on data.MemberId equals member.MemberId 
          join team in ctx.Teams 
          on member.TeamId equals team.TeamId 
          group member by member.TeamId into g 
          select new {TeamId = g.Key, TeamName = g.Select(t=>t.Teams.TeamName), TotalTime = ???}; 

Answer 1

建議。你不應該在你的查詢中使用連接。您的模型具有導航屬性，請改用它們。你可以閱讀Craig Stuntz的blogpost。

您可以在內部列表中選擇所有團隊和有關成員的信息。嘗試了這一點：

var query = ctx.data.ToList().OrderBy(d => d.Time). 
      GroupBy(d => d.Members.StepId). 
      SelectMany(g => g.Select((d, place) => new { Time = d.Time, Members = d.Members, PlaceInStep = place + 1 })). 
      GroupBy(d => d.Members.TeamId). 
      Select(g => new 
      { 
       TeamId = g.Key, 
       Name = g.Select(d => d.Members.Teams.TeamName).First(), 
       Members = g.Select(d => new {Time = d.Time, PlaceInStep = d.PlaceInStep, MemberName = d.Members.MemberName}),      
       TotalTime = g.Aggregate(new TimeSpan(), (sum, nextData) => sum.Add(nextData.Time)) 
      }); 

Answer 2

試試這個：

var query = ctx.Data.Join(ctx.Members, d => d.MemberId, m => m.MemberId, (d,m)=>new {data=d, member = m}) 
       .Join(ctx.Teams, dm=>dm.member.TeamId, t=>t.TeamId, (dm, t)=>new{data=dm.data, member=dm.member, team = t}) 
       .GroupBy(dmt=>new {dmt.team.TeamId, dmt.team.TeamName}) 
       .Select(g=>new 
          { 
           TeamId = g.Key.TeamId, 
           TeamName = g.Key.TeamName, 
           TotalTime = g.Aggregate(0, (sum, gr)=>sum.Add(gr.data.Time)) 
          });