一对多关系，一个 PK 但多个外键，添加新迁移时出现异常

如何解决一对多关系，一个 PK 但多个外键，添加新迁移时出现异常

我有一对多关系的问题，EF 6 与数据注释。当我查看类似问题时，主模型有很多主键，但在我的情况下，我只有一个 PK，但在添加新迁移时仍然发生异常，我不知道为什么。

Data1_SomeEntity_Target_Data1_SomeEntity_Source: : The number of properties in the Dependentand Principal Roles in a relationship constraint must be identical.

public class SomeEntity
{
    [Key]
    public long Id { get; set; }

    public ICollection<Data1> Data1 { get; set; }

    public ICollection<Data2> Data2 { get; set; }

    public ICollection<Data3> Data3 { get; set; }

    public ICollection<Data4> Data4 { get; set; }

    [ForeignKey("Request100")]
    public long? Request100Id { get; set; }

    public virtual Request100 Request100 { get; set; }

    [ForeignKey("Request200")]
    public long? Request200Id { get; set; }

    public virtual Request200 Request200 { get; set; }
}

public class Data1
{
    [Key]
    public long Id { get; set; }

    [MinLength(1),MaxLength(1000)]
    public string SomeProperty { get; set; }

    [MaxLength(1000)]
    public string Value { get; set; }

    [ForeignKey("SomeClass")]
    public long? SomeClassId { get; set; }

    [ForeignKey("Data2")]
    public long? Data2Id { get; set; }

    [ForeignKey("Data3")]
    public long? Data3Id { get; set; }

    [ForeignKey("SomeEntity")]
    public long? SomeEntityId { get; set; }

    [JsonIgnore]
    public virtual SomeClass SomeClass { get; set; }

    [JsonIgnore]
    public virtual Data2 Data2 { get; set; }

    [JsonIgnore]
    public virtual Data3 Data3 { get; set; }

    [JsonIgnore]
    public virtual SomeEntity SomeEntity { get; set; }
}

解决方法

你的 SomeEntity 类应该只有一个 Data - Data1 集合，你也可以添加一些导航

public class SomeEntity
{
    [Key]
    public long Id { get; set; }

    [InverseProperty(nameof(Data1.SomeEntity))]
    public ICollection<Data1> Data1s { get; set; }

    
    [ForeignKey("Request100")]
    public long? Request100Id { get; set; }

    public virtual Request100 Request100 { get; set; }

    [ForeignKey("Request200")]
    public long? Request200Id { get; set; }

    public virtual Request200 Request200 { get; set; }
}

SomeClass,Data2,Data3 应该以同样的方式配置