Linq to sql LinqToSql中的多组

我似乎无法通过在互联网上的LinqToSQl中获得支持来找到任何关于多个groupby的证据（我可能应该买本书：）

我希望能够做到这一点：

      var qry = from s in DBContext.Styles
               join artist in DBContext.Artists on s.ID equals artist.StyleID
               join track in DBContext.Tracks on s.ID equals track.StyleID
               group artist by new { s.ID, s.Name } into a
               group track by new { s.ID, s.Name } into t
               select new DTO.StyleSummary
               {
                   ID = a.Key.ID,
                   Name = a.Key.Name,
                   NumberOfArtists = a.Count(),
                   NumberOfTracks = t.Count()
               };

但是，第二组语句阻止编译。。既然这在本机sql中是可能的，我该怎么做

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想法？这可能吗？

这是因为在这个LINQ语句中您甚至不需要

groupby

。你可以这么做

var qry = from s in DBContext.Styles
          join artist in DBContext.Artists on s.ID equals artist.StyleID into a
          join track in DBContext.Tracks on s.ID equals track.StyleID into t
          select new DTO.StyleSummary
          {
               ID = s.ID,
               Name = s.Name,
               NumberOfArtists = a.Count(),
               NumberOfTracks = t.Count()
          };

将

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