c# - 实体类型上已存在同名的属性或导航 - 如何在 Entity Framework 的迁移场景中添加外键

Question

我有这个只有外键引用的类:

public class Device
{
    [Required]
    [DataMember(Name = "key")]
    [Key]
    public Guid Key { get; set; }

    [ForeignKey("DeviceType")]
    [IgnoreDataMember]
    public virtual DeviceType DeviceType { get; set; }

    [ForeignKey("Model")]
    [IgnoreDataMember]
    public virtual ModelType Model { get; set; }
}

运行命令时出现错误

 Add-Migration -Name "DeviceMigration"

错误是:

The property or navigation 'DeviceType' cannot be added to the entity type 'Device' because a property or navigation with the same name already exists on entity type 'Device'.

这是我的上下文类内容

 public class MyContext: DbContext
 {
     public MyContext(DbContextOptions<MyContext> options)
        : base(options)
     { }

     public DbSet<DeviceType> DeviceTypes { get; set; }
     public DbSet<Device> Devices { get; set; }
 }

Answer 1

对于我的情况，我误用了 ForeignKey 属性:

[IgnoreMap]
public long? PLCalculationMasterId { get; set; }
[ForeignKey("PLCalculationMaster"), IgnoreMap, IgnoreDataMember]
public PLCalculationMaster PLCalculationMaster{ get; set; }

而它应该是:

[IgnoreMap]
public long? PLCalculationMasterId { get; set; }
[ForeignKey("PLCalculationMasterId"), IgnoreMap, IgnoreDataMember]
public PLCalculationMaster PLCalculationMaster{ get; set; }