C# 实体树模型答案

【问题标题】：C# Entities Tree Model [closed]C# 实体树模型
【发布时间】：2020-05-25 17:54:03
【问题描述】：

在博客页面上， 子类别将链接到主类别，并且将是子类别的文章。你觉得模型结构正确吗？

我将使用 Asp.net Core 和 EntityFrameworkCore 架构进行开发。

public class Category
{
    public int Id { get; set; }

    public string CategoryName { get; set; }


    public bool IsActive { get; set; }

    public ICollection<SubCategory> SubCategories { get; set; }
}
--------------------------------------
public class SubCategory
{
    public int Id { get; set; }

    public string SubCategoryName { get; set; }


    public bool IsActive { get; set; }

    public int CategoryId { get; set; }

    public virtual Category Category { get; set; }

    public virtual ICollection<Article> Articles { get; set; }
}
----------------------------------------------
public class Article
{
    public int Id { get; set;}

    public string ArticleTitle { get; set; }

    public string ArticleContent { get; set; }

    public DateTime PublishDate { get; set; }

    public int AuthorId { get; set; }
    public virtual Author Author { get; set; }

    public int SubCategoryId { get; set; }
    public virtual SubCategory SubCategory { get; set; }
}

【问题讨论】：

标签： c# entity-framework asp.net-core model tree

【解决方案1】：

另一种方法是将类别模型更改为Self-referencing relationship

这些链接对Self-referencing 很有帮助 1 , 2

public class Category
{
    public int Id { get; set; }

    public string CategoryName { get; set; }
    public int? ParentId { get; set; }

    public bool IsActive { get; set; }
    public Category Parent { get; set; }
    public ICollection<Category> SubCategories { get; set; }
    public ICollection<ArticleCategories> ArticleCategories { get; set; }
}

然后在Article和Category类之间创建Many-to-Many关系

public class ArticleCategories
{
    public int ArticleId { get; set; }
    public int CategoryId { get; set; }
    public Category Category { get; set; }
    public Article Article { get; set; }
}

文章型号

public class Article
{
    public int Id { get; set;}

    public string ArticleTitle { get; set; }

    public string ArticleContent { get; set; }

    public DateTime PublishDate { get; set; }

    public int AuthorId { get; set; }
    public virtual Author Author { get; set; }

    public ICollection<ArticleCategories> ArticleCategories { get; set; }
}

在这种情况下，任何Article 可以有多个Category，任何Category 可以用于多个Articles

【讨论】：

谢谢我试试