同一类的映射子项与实体框架代码优先 [英] Mapping child items of same class with Entity Framework Code First

问题描述

我试图用映射代码EF首先

I'm trying to map a fairly "standard" category model using EF Code First

public class Category
{
    public int ID { get; set; }
    public int ParentID { get; set; }

    public string Name { get; set; }

    public Category ParentCategory { get; set; }
    public List<Category> ChildCategories { get; set; }
}

我沿着线得到的东西：

I've got something along the lines of:

modelBuilder.Entity<Category>()
    .HasOptional(t => t.ParentCategory)
    .WithMany()
    .HasForeignKey(t => t.ParentCategoryID)
    .WillCascadeOnDelete();

但是，这似乎并没有采取ChildCategories照顾??

But this doesn't seem to take care of ChildCategories??

我缺少的东西。

要避免重复问题的说法，我也跟着以下，但并没有完全回答我的具体查询：

To avoid the duplicate question argument, I followed the following, however didn't quite answer my specific query:

代码首先映射实体框架层次

的实体框架CTP5代码优先映射 - 同一表的外键

推荐答案

你的实体改为

public class Category
{
    public int ID { get; set; }
    public int? ParentID { get; set; }

    public string Name { get; set; }

    public virtual Category ParentCategory { get; set; }
    public virtual IList<Category> ChildCategories { get; set; }
}

请 PARENTID 可空，并让 ChildCategories 偷懒装，使其虚拟化。

Make ParentID nullable and to allow ChildCategories to be lazy loaded, make it virtual.

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