如何将导航属性配置为Entity Framework中的同一个表？ [英] How do I configure a navigation property to the same table in Entity Framework?

问题描述

如何使用流畅的配置来配置Entity Framework，使其与属性相同：

How do I configure Entity Framework using fluent configuration to behave the same way that I would do this with attributes:

public class Product
{
    public int? ParentId { get; set; }
    [ForeignKey("ParentId")]
    public virtual Product Parent { get; set; }
}

推荐答案

假设你想创建一个自引用实体，我假设你有一个这样的产品类：

Supposing that you want to create a self referencing entity, I assume that you have a Product class like this:

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

    public int? ParentId { get; set; }

    public virtual Product Parent { get; set; }
}

在上下文中，您需要实现 OnModelCreating 方法，以配置自引用。

In the context, you need to implement the OnModelCreating method in order to configure the self reference.

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
  modelBuilder.Entity<Product>().
       HasOptional(e => e.Parent).
       WithMany().
       HasForeignKey(m => m.ParentId);
}

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