API 返回许多完全相同的行

Question

我有两个应用程序：

1. API

2. Web 表单应用程序

我在 API 中使用 Entity Framework 5。

Web 表单应用程序进行 API 调用并检索一些数据。

无论出于何种原因，当我取回数据时，它给了我几行完全相同的数据。

这里的问题是，当我使用 SQL Server Profiler 并查看查询时，查询是正确的，如果我采用此查询并在 SQL 中运行它，结果是正确的。但是，在 Web Forms App 中，很多数据都以相同的方式返回。

看看这两张截图——

运行应用程序：

获取实体框架生成的SQL查询并运行到SQL中：

如你所见，这让我很困惑......

有人知道这里有什么问题吗？

这是我的 EF 模型：

实体框架生成的查询：

{SELECT 
[Extent1].[dataSource] AS [dataSource], 
[Extent1].[ShowId] AS [ShowId], 
[Extent1].[Title] AS [Title], 
[Extent1].[EpisodeId] AS [EpisodeId], 
[Extent1].[EpisodeTitle] AS [EpisodeTitle], 
[Extent1].[Genre] AS [Genre], 
[Extent1].[ShowTypeDescription] AS [ShowTypeDescription], 
[Extent1].[DirectorName] AS [DirectorName], 
[Extent1].[ReleaseYear] AS [ReleaseYear], 
[Extent1].[SeasonEpisode] AS [SeasonEpisode]
FROM (SELECT 
      [TVData_VW_ShowList].[dataSource] AS [dataSource], 
      [TVData_VW_ShowList].[ShowId] AS [ShowId], 
      [TVData_VW_ShowList].[Title] AS [Title], 
      [TVData_VW_ShowList].[EpisodeId] AS [EpisodeId], 
      [TVData_VW_ShowList].[EpisodeTitle] AS [EpisodeTitle], 
      [TVData_VW_ShowList].[Genre] AS [Genre], 
      [TVData_VW_ShowList].[ShowTypeDescription] AS [ShowTypeDescription], 
      [TVData_VW_ShowList].[DirectorName] AS [DirectorName], 
      [TVData_VW_ShowList].[ReleaseYear] AS [ReleaseYear], 
      [TVData_VW_ShowList].[SeasonEpisode] AS [SeasonEpisode]
      FROM [dbo].[TVData_VW_ShowList] AS [TVData_VW_ShowList]) AS [Extent1]
WHERE [Extent1].[Title] LIKE @p__linq__0 ESCAPE '~'}

我通过进入调试模式得到了这个查询。如果我在实际数据库中运行它，它会返回正确的结果。

控制器代码：

公共类 ShowsController : ApiController { 私有只读 TVDataEntities 数据库；

public ShowsController()
{
    db = new TVDataEntities();
    db.Configuration.ProxyCreationEnabled = false;
}

public IEnumerable<TVData_VW_ShowList> GetTVData_VW_ShowList(string dataSource = null, string title = null,
                                                             string episodeTitle = null, string genre = null,
                                                             string showTypeDescription = null,
                                                             string directorName = null,
                                                             string releaseYear = null,
                                                             string seasonEpisode = null)
{
    var query = from s in db.TVData_VW_ShowList select s;

    if (dataSource != null)
    {
        if (dataSource != "all")
        {
            query = query.Where(s => s.dataSource.Contains(dataSource));
        }
    }

    if (title != null)
    {
        query = query.Where(s => s.Title.Contains(title));
    }

    if (episodeTitle != null)
    {
        query = query.Where(s => s.EpisodeTitle.Contains(episodeTitle));
    }

    if (genre != null)
    {
        query = query.Where(s => s.Genre.Contains(genre));
    }

    if (showTypeDescription != null)
    {
        query = query.Where(s => s.ShowTypeDescription.Contains(showTypeDescription));
    }

    if (directorName != null)
    {
        query = query.Where(s => s.DirectorName.Contains(directorName));
    }

    if (releaseYear != null)
    {
        query = query.Where(s => s.ReleaseYear.ToString().Contains(releaseYear));
    }

    if (seasonEpisode != null)
    {
        query = query.Where(s => s.SeasonEpisode.Contains(seasonEpisode));
    }

    return query.ToList();
}

}

Answer 1

问题已解决。这是 Linq 查询。

这是正确的：

IQueryable<ETSShows> query = from shows in db.ETS_Shows
                                         from episodes in
                                             db.ETS_Episodes.Where(v => v.ShowId == shows.ShowId).DefaultIfEmpty()
                                         from genres in
                                             db.ETS_LKP_Genres.Where(s => s.GenreCode == shows.GenreCode).DefaultIfEmpty()
                                         from showTypes in
                                             db.ETS_LKP_ShowTypes.Where(z => z.ShowTypeCode == shows.ShowTypeCode).DefaultIfEmpty()
                                         from directors in
                                             db.ETS_Directors.Where(p => p.ShowId == shows.ShowId).DefaultIfEmpty()
                                         select new ETSShows
                                             {
                                                 DataSource = "ETS",
                                                 Title = shows.Title,
                                                 EpisodeTitle = episodes.EpisodeTitle,
                                                 Genre = genres.GenreDescription,
                                                 ShowTypeDescription = showTypes.ShowTypeDescription,
                                                 DirectorName = directors.Name,
                                                 ReleaseYear = (int)shows.ReleaseYear,
                                                 SeasonEpisode = episodes.SeasonEpisode,
                                                 ShowId = shows.ShowId,
                                                 EpisodeId = episodes.EpisodeId
                                             };