小编ars*_*ogy的帖子

在Julie Lerman的Pluralsight"Entity Framework 5入门"课程的"Code First Modeling"部分之后,我创建了两个POCO类,其中包含一对一或零关系:父(User)和可选孩子(UserDetail).

User和UserDetail数据模型图(点击查看).

请注意,图中UserId属性是UserDetail的主键和外键.

相关代码:

public class User
{
    //...

    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int UserId { get; set; }

    /* Has a 1:0..1 relationship with UserDetail */
    public virtual UserDetail UserDetail { get; set; }

    //...
}

public class UserDetail
{
    //...

    /* Has a 0..1:1 relationship with User */
    public virtual User User { get; set; }

    [Key, ForeignKey("User")]
    public int UserId { get; set; …