关系约束中的 Dependent 和 Principal Roles 中的属性数量必须相同

Question

尝试在 EF 中添加迁移时遇到问题。错误是

RegisterCountLog_Register_Target_RegisterCountLog_Register_Source: : 关系约束中的从属角色和主体角色中的属性数量必须相同。

类如下：

public class RegisterCountLog
{
    [ForeignKey("CountLog")]
    public long DeviceSerial { get; set; }

    [Key, Column(Order = 2)]
    [ForeignKey("CountLog")]
    public long LogEntryID { get; set; }

    [Key, Column(Order = 3)]
    [ForeignKey("Register")]
    public long RegisterId { get; set; }

    public long Value { get; set; }

    public virtual CountLog CountLog { get; set; }

    public virtual Register Register { get; set; }
}

public class Register
{
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    [Key, Column(Order = 1)]
    public long RegisterId { get; set; }

    [Key, ForeignKey("Device"), Column(Order = 2)]
    public long DeviceSerial { get; set; }

    [StringLength(50)]
    public string RegisterName { get; set; }

    public ContributionType Contribution { get; set; }    

    public virtual Device Device { get; set; }

    public virtual ICollection<RegisterCountLog> CountLogs { get; set; }
}

谁能帮忙？

Answer 1

因此注册模型有一个组合键RegisterId 和DeviceSerial，您必须在RegisterCountLog 模型中指定这两个键。

[ForeignKey("RegisterId,DeviceSerial")]
public virtual Register Register { get; set; }