[英]Where and join in LINQ is not working
我有以下功能:
public IList<Movie> GetMovieTimeTable(DateTime date)
{
var result = (from m in movierepo.Movies
join t in timetablerepo.TimeTables on m.MovieId equals t.MovieId
where t.StartTime.Date == date.Date
select m).Distinct().ToList();
return result;
}
它工作正常,但where條件不起作用。 仍會返回來自timetablerepo的所有具有相同MovieId的記錄。 是什么原因呢? 我做錯了什么? 正確的方法是什么?
編輯:示例:
我在MovieId = 34的電影中有一條記錄,在時間表中有3條記錄:
MovieId StartTime
34 08-06-2015 19:00
34 09-06-2015 21:00
34 10-06-2015 20:00
(Dutch DateTime Format)
給定“日期”中的日期,我想過濾到當天的記錄。 (此時此刻很重要)。 現在,我正在獲取這些記錄。
范例2:
DateTime日期= {8-6-2015 00:00:00}
Result.Count=6 (That's right)
[0]
MovieId = 2
(Etc..)
TimeTables
[0]
MovieId = 2
StartTime = {5-5-2015 20:00:00}
(Etc..)
[1]
MovieId =2
StartTime = {28-5-2015 20:00:00}
(Etc..)
[1]
MovieId = 13
TimeTables
[0]
MovieId = 13
StartTime = {28-5-2015 21:00:00}
(etc..)
[1]
MovieId = 13
StartTime = {28-5-2015 19:50:00}
(etc..)
(etc..)
編輯3:電影模型:
public partial class Movie
{
public Movie()
{
TimeTables = new HashSet<TimeTable>();
}
[Key]
public int MovieId { get; set; }
public string MovieName { get; set; }
public int MovieGenre { get; set; }
public string MoviePicture { get; set; }
public string MovieDescription { get; set; }
public string MovieShortText { get; set; }
public bool? MovieIs3d { get; set; }
public bool? MovieIsImax { get; set; }
public int MovieLanguage { get; set; }
public bool? MovieSubtitled { get; set; }
public int? MovieMinimalAge { get; set; }
public bool? MovieHasDrugs { get; set; }
public bool? MovieHasViolence { get; set; }
public bool? MovieHasSex { get; set; }
public bool? MovieHasSwearing { get; set; }
public bool? MovieIsScary { get; set; }
public bool? MovieHasDiscrimination { get; set; }
public string MovieTrailer { get; set; }
public int MovieLength { get; set; }
public int? Genre_GenreId { get; set; }
public int? Language_LanguageId { get; set; }
public virtual Genre Genre { get; set; }
public virtual Language Language { get; set; }
public virtual ICollection<TimeTable> TimeTables { get; set; }
}
時間表:
public partial class TimeTable
{
public TimeTable()
{
Reservations = new HashSet<Reservation>();
}
public int TimeTableId { get; set; }
public int MovieId { get; set; }
public int RoomId { get; set; }
public int SeatsAvaible { get; set; }
public DateTime StartTime { get; set; }
public DateTime EndTime { get; set; }
public virtual Movie Movie { get; set; }
public virtual ICollection<Reservation> Reservations { get; set; }
public virtual Room Room { get; set; }
}
編輯4:也可以查詢時間表到電影的時間表,但是我會得到多個電影記錄,因為時間表中每個電影都有1條以上的記錄,而我的查詢條件不是很好,但是如果有解決方案,我會樂於聽到:)
最終,我相信問題是因為您試圖重用數據類來保存View數據。 僅創建一組新的類將是最簡單的,但這可能會幫助您:
public IList<Movie> GetMovieTimeTable(DateTime date)
{
var result = movierepo.Movies
.Join(timetablerepo.TimeTables,m=>m.MovieId,tt=>tt.MovieId,
(m,g)=>new Movie{
MovieId=m.MovieId,
... rest of properties here ...
TimeTables=g.Where(tt=>tt.StartDate.Date==date.Date).ToList()
})
.Where(m=>m.TimeTables.Any())
.ToList();
return result;
}
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