entity-framework - EF 中的列名无效

Question

我有一种情况，EF 试图从表“VideoClip”中获取我没有要求它获取的字段值。

生成的完整查询如下所示：

SELECT 
[Project1].[Id] AS [Id], 
[Project1].[NewsItemId] AS [NewsItemId], 
[Project1].[VideoClipId] AS [VideoClipId], 
[Project1].[DisplayOrder] AS [DisplayOrder], 
[Project1].[Video_Id] AS [Video_Id]
FROM ( SELECT 
    [Extent1].[Id] AS [Id], 
    [Extent1].[NewsItemId] AS [NewsItemId], 
    [Extent1].[VideoClipId] AS [VideoClipId], 
    [Extent1].[DisplayOrder] AS [DisplayOrder], 
    [Extent1].[Video_Id] AS [Video_Id]
    FROM [dbo].[NewsItemVideoClip] AS [Extent1]
    WHERE [Extent1].[NewsItemId] = @p__linq__0
)  AS [Project1]
ORDER BY [Project1].[DisplayOrder] DESC

但是，我的NewsItemVideoClip实体类如下所示：

public class NewsItemVideoClip : Entity
{
    public virtual int NewsItemId { get; set; }
    public virtual int VideoClipId { get; set; }
    public virtual int DisplayOrder { get; set; }
    public virtual NewsItem NewsItem { get; set; }
    public virtual VideoClip VideoClip { get; set; }
}

映射：

public class NewsItemVideoClipEntityMapping
    : EntityTypeConfiguration<NewsItemVideoClip>
{
    public NewsItemVideoClipEntityMapping()
    {
        //configure key and properties
        HasKey(c => c.Id);

        this.HasRequired(x => x.NewsItem)
            .WithMany(x => x.NewsItemVideoClips)
            .HasForeignKey(x => x.NewsItemId);

        this.HasRequired(x => x.VideoClip)
            .WithMany(x => x.NewsItemVideos)
            .HasForeignKey(x => x.VideoClipId);

        //configure table map
        ToTable("NewsItemVideoClip");
    }
}

LINQ 查询：

public IList<NewsItemVideoClip> GetVideoClips(int newsItemId)
{
    var query = from nvc in _newsItemVideoClipRepository.GetAll()
                where nvc.NewsItemId == newsItemId
                orderby nvc.DisplayOrder descending
                select nvc;

    var newsItemVideoClips = query.ToList();
    return newsItemVideoClips;
}

EF怎么给我：Invalid column name 'Video_Id'？

Answer 1

根据您的图表，VideoClip 有一个 VideoId，我猜这是您对 Video 的预期外键。Video_Id 将是在没有映射的情况下外键的默认外键名称，否则会命名它。所以可能需要一个.HasForeignKey(x => x.VideoId);到你的VideoClip映射。