Question

我有三个模型：Document，Section和Paragraph。每个人都是这样的。

// Document
public class Document
{
    public int Id { get; set; }
    public string Name { get; set; }
    public virtual ICollection<Section> Sections { get; set; }
}

// Section
public class Section
{
    public int Id { get; set; }
    public int DocumentId { get; set; }
    public virtual Document Document { get; set; }
    public virtual ICollection<Paragraph> Paragraphs { get; set; }
}

// Paragraph
public class Paragraph
{
    public int Id { get; set; }
    public int SectionId { get; set; }
    public virtual Section Section { get; set; }
}

实体会自动填充Section.Paragraphs所有段落SectionId == Id。 Document.Sections虽然没有发生这种情况。 Document.Sections的所有部分都填充DocumentId == id，而Document.Sections为空，而不是{{1}}。哎呀！

Answer 1

添加以下注释：

// Document
public class Document
{
    [Key]
    public int Id { get; set; }
    public string Name { get; set; }

    [InverseProperty("Document")]
    public virtual ICollection<Section> Sections { get; set; }
}

// Section
public class Section
{
    [Key]
    public int Id { get; set; }
    [ForeignKey("Document")]
    public int DocumentId { get; set; }

    public virtual Document Document { get; set; }

    [InverseProperty("Section")]
    public virtual ICollection<Paragraph> Paragraphs { get; set; }
}

// Paragraph
public class Paragraph
{
    [Key]
    public int Id { get; set; }

    [ForeignKey("Section")]
    public int SectionId { get; set; }


    public virtual Section Section { get; set; }
}

我也会考虑这个：

public class YourContext : DbContext
{
    public DbSet<Document> Documents {get;set;}
    public DbSet<Paragraph> Paragraphs {get;set;}
    public DbSet<Section> Sections {get;set;}
}

告诉我它是否以任何方式帮助了你。如何加载实体可能存在问题（您使用Include）吗？

为什么实体不会自动完成关系？

1 个答案: