與同一張表一對一相關的兩個屬性

Question

我想創建兩個屬性與關係到同一個表的表，一對一。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; } 
} 

這裏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); 

它創建數據庫中的一個一對多。爲什麼？

編輯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; } 
} 

這裏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); 

我有錯誤：

ProjectImage_Thumbnail_Source: : Multiplicity is not valid in Role 'ProjectImage_Thumbnail_Source' in relationship 'ProjectImage_Thumbnail'. Because the Dependent Role properties are not the key properties, the upper bound of the multiplicity of the Dependent Role must be '*'.

Answer 1

試試這個：

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; } 
}