與EF4.3同一張表的多對多關係代碼優先

Question

如何使用此模式進行配置？

CREATE TABLE Entity 
(
    Id int identity primary key, 
    Name nvarchar(30) 
) 

CREATE TABLE Member 
(
    ParentEntityId references Entity(Id), 
    ChildEntityId references Entity(Id) 
) 

Answer 1

像這樣：

模型類：

public class Entity 
{ 
    public int Id { get; set; } 
    public string Name { get; set; } 

    public ICollection<Entity> Parents { get; set; } 
    public ICollection<Entity> Children { get; set; } 
} 

映射：

modelBuilder.Entity<Entity>() 
    .HasMany(e => e.Parents) 
    .WithMany(e => e.Children) 
    .Map(m => 
    { 
     m.ToTable("Member"); 
     m.MapLeftKey("ParentEntityId"); 
     m.MapRightKey("ChildEntityId"); 
    });