开发者

Retrieve whole object in a join instead of just properties

开发者 https://www.devze.com 2023-02-16 19:41 出处:网络
Is there anyway I can get the whole object Platform instead of just the properties in this query, I am using Poco with EF4:

Is there anyway I can get the whole object Platform instead of just the properties in this query, I am using Poco with 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                                 

      });

Instead of using PlatformId and PlatformShort I just want to retrieve the whole Platform object (j). Like "Platform = j"

And is there any better way to return a typed collection with out iterating through games first ?

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);
            }

I tried this instead:

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

ANd now i got same value for all 100 rec开发者_C百科ords.

Here is the 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]


Yes there is a better way:

var collection = context.Games.Include("Platform").ToList();
0

精彩评论

暂无评论...
验证码 换一张
取 消