Code First与现有数据库

Question

我在数据库中有一个指向自身的表，即parent_id＆gt;＆gt;类别ID。这是ER图

我已将此表格建模如下，但它提供了 *错误：'类别'：成员名称不能与其封闭类型相同：

public class Category
{
    [Key]
    public int category_id { get; set; }
    public string category_name { get; set; }
    public int category_parent { get; set; }
    public string category_desc { get; set; }

    public virtual Category Category { get; set; }
}

我应该如何建模这样的表格？

Answer 1

您必须使category_parent为空，并将导航属性Category配置为标量属性category_parent。尝试使用正确的命名约定。

public class Category
{
    [Key]
    [Column("category_id")]
    public int Id { get; set; }

    [Column("category_name")]
    public string Name { get; set; }

    [Column("category_parent")]
    public int? ParentId { get; set; }

    [Column("category_desc")]
    public string Description { get; set; }

    [ForeignKey("ParentId")]
    public virtual Category ParentCategory { get; set; }
}

Answer 2

我认为您只需将Category属性名称更改为其他名称，因此它与类名称不同...

public virtual Category SubCategory { get; set; }

Answer 3

public class Category
{
    [Key]
    public int category_id { get; set; }
    public string category_name { get; set; }
    public int category_parent { get; set; }
    public string category_desc { get; set; }

    public int parent_category_id { get; set; } <-- ADD & setup as foreign key
    public virtual Category ParentCategory { get; set; } <-- Change name

    public virtual ICollection<Category> Categories { get; set; }
}

---

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);

    modelBuilder.Entity<Category>.HasMany(cat => cat.Categories)
            .WithRequired()
            .HasForeignKey(cat => cat.parent_category_id);        
}