Linq To Sql select命令

Question

你能幫我把這個select命令改成linq to sql select命令嗎？

string value = ddl.SelectedValue; 

SELECT * 
FROM Song 
WHERE SongID IN (
      SELECT SongID 
      FROM AlbumSong 
      WHERE AlbumID = @value) 

Answer 1

下面是用更簡潔dot notation

var dataContext = new YouDataContext(); 
int value = 10; 
dataContext.Song.Where(a => 
    dataContext.AlbumSong.Where(alSong => alSong.AlbumId == value) 
          .Select(alSong => alSong.SongId).Contains(a.SongId)); 

Answer 2

您有：

"SELECT * FROM Song WHERE SongID in (SELECT SongID FROM AlbumSong WHERE AlbumID = " + value + ")"

有你爲什麼不使用這裏加入的原因，而不是嵌套查詢？像：

"SELECT * FROM Song INNER JOIN AlbumSong ON Song.SongId = AlbumSong.SongId WHERE AlbumID = " + value

還是我誤解你需要在這裏和加入是不是合適？