与同一张表一对一相关的两个属性

Question

我想创建具有两个属性的表，这些属性与同一个表具有一对一的关系。我的模型：

public class ImageFile : BaseEntity
{
    [Key]
    Guid Guid { get; set; }
    public string Name { get; set; }        
    public string Extension { get; set; }

    public long Size { get; set; }
    public byte[] FileContent { get; set; }                
    public ProjectImage ProjectImage { get; set; }
}

public class ProjectImage : BaseEntity
{    
    public string Description { get; set }            
    public ImageFile Thumbnail { get; set; }
    public ImageFile FullSizeImage { get; set; }
}

这是我的上下文的一部分：

modelBuilder.Entity<ProjectImage>()
    .HasRequired(f => f.FullSizeImage)
    .WithOptional(i => i.ProjectImage);
modelBuilder.Entity<ProjectImage>()
    .HasRequired(f => f.Thumbnail)
    .WithOptional(i => i.ProjectImage);

它以一对多的方式创建数据库。为什么？

编辑 V2：

public class ImageFile : BaseEntity
{
    [Key]
    Guid Guid { get; set; }
    public string Name { get; set; }        
    public string Extension { get; set; }

    public long Size { get; set; }
    public byte[] FileContent { get; set; }    
    public Guid? ProjectImageGuid { get; set; }

    [ForeignKey("ProjectImageGuid")]            
    public ProjectImage ProjectImage { get; set; }
}

public class ProjectImage : BaseEntity
{    
    public string Description { get; set }            
    public Guid? ThumbnailGuid { get; set; }        
    public Guid? FullSizeImageGuid { get; set; }

    [ForeignKey("ThumbnailGuid")]
    public ImageFile Thumbnail { get; set; }

    [ForeignKey("FullSizeImageGuid")]
    public ImageFile FullSizeImage { get; set; }
}

这是我的上下文的一部分：

modelBuilder.Entity<ProjectImage>()
    .HasRequired(f => f.FullSizeImage)
    .WithOptional(i => i.ProjectImage);
modelBuilder.Entity<ProjectImage>()
    .HasRequired(f => f.Thumbnail)
    .WithOptional(i => i.ProjectImage);

我有错误：

ProjectImage_Thumbnail_Source: : 多重性在角色中无效 关系中的“ProjectImage_Thumbnail_Source” 'ProjectImage_Thumbnail'。因为从属角色属性是 不是关键属性，多重性的上限 从属角色必须是“*”。

Answer 1

试试这个：

public class ImageFile : BaseEntity
{
    [Key]
    Guid Guid { get; set; }
    public string Name { get; set; }        
    public string Extension { get; set; }

    public long Size { get; set; }
    public byte[] FileContent { get; set; }    


    public Guid ProjectImageGuid { get; set; }

    [ForeignKey("ProjectImageGuid")]            
    public ProjectImage ProjectImage { get; set; }
}

public class ProjectImage : BaseEntity
{    
    public string Description { get; set }            
    public Guid ThumbnailGuid { get; set; }        
    public Guid FullSizeImageGuid { get; set; }

    [ForeignKey("ImageFileGuid")]
    public ImageFile Thumbnail { get; set; }

    [ForeignKey("ImageFileGuid")]
    public ImageFile FullSizeImage { get; set; }
}