EF Core 列名无效（外键）

Question

我使用的是 EF Core 2.2 错误代码

var ClientCase= _context.Client_Cases.Include(a=>a.Case_Sessions). FirstOrDefault(x => x.Id == id);

错误

System.Data.SqlClient.SqlException: '无效的列名 'Client_CaseId'。列名“Case_LevelId”无效。列无效 名称“Client_CaseId”。列名“Court_CircleId”无效。无效的 列名“Court_HallId”。

实体

1- 父客户案例

public class Client_Cases
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public long Id { get; set; }        
    public string Opponent { get; set; }
    public DateTime? StartDate { get; set; }
    public DateTime Recieve_Date { get; set; }
    [ForeignKey("Clients")]
    public long? ClientID { get;set;}
    public Clients Client { get; set; }
    [ForeignKey("Case_Levels")]
    public long? LevelID { get; set; }
    public virtual Case_Levels Case_Levels { get; set; }
    [ForeignKey("Case_Types")]
    public long? TypeID { get; set; }
    public virtual Case_Types Case_Types { get; set; }
    [ForeignKey("Court_Circles")]
    public long? CircleID { get; set; }
    public virtual Court_Circles Court_Circles { get; set; }
    [ForeignKey("Court_Halls")]
    public long? HallID { get; set; }
    public virtual Court_Halls Court_Halls { get; set; }
    [ForeignKey("Courts")]
    public long? CourtID { get; set; }
    public virtual Courts Court { get; set; }
    [ForeignKey("Case_Status")]
    public long? StatusID { get; set; }
    public Case_Status Case_Status { get; set; }
    [ForeignKey("Lawyers")]
    public long? LawyerID { get; set; }
    public virtual LawyersData Lawyers { get; set; }
    public string Description { get; set; }
    public string Code { get; set; }
    public string CaseNo { get; set; }
    public List<Case_Sessions> Case_Sessions { get; set; }
}

详细实体Case_Session

public class Case_Sessions
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public long Id { get; set; }        
    [ForeignKey("Client_Cases")]
    public long? CaseID { get;set;}
    public Client_Cases Client_Case { get; set; }
    [ForeignKey("Case_Levels")]
    public long? LevelID { get; set; }
    public Case_Levels Case_Level { get; set; }
    [ForeignKey("Court_Circles")]
    public long? CircleID { get; set; }
    public Court_Circles Court_Circle { get; set; }
    [ForeignKey("Court_Halls")]
    public long? HallID { get; set; }
    public Court_Halls Court_Hall { get; set; }
    [ForeignKey("Case_Status")]
    public long? StatusID { get; set; }
    public Case_Status Case_Status { get; set; }
    public DateTime Session_Date { get; set; }
    public string Judge_Name { get; set; }
    public string Session_Result { get; set; }
    public string Notes { get; set; }
}

如果我得到父母而不包括孩子，它会起作用。
如果我得到详细信息，它会起作用。

我知道 EF Core 为外键创建自己的命名约定的错误 但我认为标签外键覆盖了该命名约定

现在我哪里错了？

Answer 1

[ForeignKey("")] 是什么意思？将您在类中添加的属性命名为外键。例如：

public long? CaseID { get;set;}
[ForeignKey("CaseID")]
public Client_Cases Client_Case { get; set; }

public long? CircleID { get; set; }
[ForeignKey("CircleID")]
public Court_Circles Court_Circle { get; set; }

您可以使用上面的注释，在您的情况下，需要进行以下更正：

[ForeignKey("Client")] // it should be [ForeignKey("Client")] not an extra s if you using entities name in annotation.
    public long? ClientID { get;set;}
    public Clients Client { get; set; }

这应该是你与律师的关系：

[ForeignKey("Lawyers")]
    public long? LawyersID { get; set; }
    public virtual LawyersData Lawyers { get; set; }

我假设 LawyersData 表中的主键类型很长？