檢索整個對象的加入而不僅僅是性能

Question

反正是有，我可以在此查詢得到整個對象平臺而不只是性質的，我使用波科與EF4：

var games = (from g in ctx.Games 
join p in ctx.Platforms on g.Platform.Id equals p.Id into joinTable 
from j in joinTable.DefaultIfEmpty()        
    select new 
    { 
     GameId = g.Id, 
     Title = g.Title, 
     PlatformId = j.Id, 
     PlatformShort = j.Platform_short         

     }); 

而不是使用PlatformId的和PlatformShort我只想檢索整個Platform對象（j）。像「平臺= j」

有沒有更好的方式來返回類型集合與迭代通過遊戲第一？

foreach (var g in games) 
      { 
       Game game = new Game(); 
       game.Platform = new Platform(); 
       game.Id = g.GameId; 
       game.Title = g.Title; 
       game.Platform.Id = g.PlatformId; 
       game.Platform.Platform_short = g.PlatformShort;      

       col.Add(game); 
      } 

我嘗試這樣做，而不是：

return ctx.Games.Include("Platform").Take(50).ToList();

，現在我得到了所有100次記錄相同的值。

這裏是SQL：

FROM [dbo].[Games] AS [Extent1] 
LEFT OUTER JOIN (SELECT [Extent2].[Id] AS [Id1], [Extent2].[Platform_short] AS [Platform_short], [Extent2].[Platform_long] AS [Platform_long], [Extent2].[Description] AS [Description], [Extent2].[Image] AS [Image], [Extent2].[CreatedDate] AS [CreatedDate1], [Extent2].[ModifiedDate] AS [ModifiedDate1] 
    FROM [dbo].[Platforms] AS [Extent2] 
    LEFT OUTER JOIN [dbo].[Games] AS [Extent3] ON [Extent2].[Id] = [Extent3].[PlatformId]) AS [Join1] ON [Extent1].[PlatformId] = [Join1].[Id1] LEFT OUTER JOIN (SELECT [Extent4].[Id] AS [Id3], [Extent5].[Id] AS [Id2] 
    FROM [dbo].[Platforms] AS [Extent4] 
    LEFT OUTER JOIN [dbo].[Games] AS [Extent5] ON [Extent4].[Id] = [Extent5].[PlatformId]) AS [Join3] ON [Extent1].[PlatformId] = [Join3].[Id3] 

Answer 1

是的，有一個更好的辦法：

var collection = context.Games.Include("Platform").ToList();