实体框架 - 外键 - 数据注释

Question

我在EF中使用Data annotation,我有类:

[Table("Accounts")]
public class DbAccount
{
    public int Id { get; set; }
    public string Username { get; set; }

    public virtual DbLicense License { get; set; }
}

[Table("Licenses")]
public class DbLicense
{
    public int Id { get; set; }
    public int AccountId { get; set; }

    [ForeignKey("AccountId")]
    public virtual DbAccount Account { get; set; }
}

我必须如何装饰属性public virtual DbLicense License {get; 组; }？

EF投掷

无法确定类型'DbLicense'和'DbAccount'之间关联的主要结束.必须使用关系流畅API或数据注释显式配置此关联的主要结尾.

这项工作很好:

modelBuilder.Entity<DbAccount>()
            .HasRequired(x => x.License)
            .WithRequiredPrincipal();

但是如何用注释来编写呢？

Answer 1

配置一对一关系时,Entity Framework要求依赖关系的主键也是外键.

试试这个:

[Table("Accounts")]
public class DbAccount
{
    [Key]
    public int Id { get; set; }
    public string Username { get; set; }

    [InverseProperty("Account")]
    public virtual DbLicense License { get; set; }
}

[Table("Licenses")]
public class DbLicense
{
    [Key, ForeignKey("Account")]
    public int Id { get; set; }
    public int AccountId { get; set; }
    [InverseProperty("License")]
    public virtual DbAccount Account { get; set; }
}