Entity Framework 6如何使用两个外键保存实体

// 实体类A
public class EntityA
{
    public int Id { get; set; }
    public int EntityBId1 { get; set; }
    public int EntityBId2 { get; set; }

    public virtual EntityB EntityB1 { get; set; }
    public virtual EntityB EntityB2 { get; set; }
}

// 实体类B
public class EntityB
{
    public int Id { get; set; }
    // 其他属性
}

// 上下文类
public class MyContext : DbContext
{
    public DbSet<EntityA> EntityAs { get; set; }
    public DbSet<EntityB> EntityBs { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<EntityA>()
            .HasRequired(a => a.EntityB1)
            .WithMany()
            .HasForeignKey(a => a.EntityBId1);

        modelBuilder.Entity<EntityA>()
            .HasRequired(a => a.EntityB2)
            .WithMany()
            .HasForeignKey(a => a.EntityBId2);
    }
}

// 添加数据
using (var context = new MyContext())
{
    var entityB1 = new EntityB();
    var entityB2 = new EntityB();

    var entityA = new EntityA
    {
        EntityB1 = entityB1,
        EntityB2 = entityB2
    };

    context.EntityAs.Add(entityA);
    context.SaveChanges();
}