实体框架数据库映射

Question

public class Requisitions
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int JobID { get; set; }
        [Required]
        public string JobNumber { get; set; }
        [Required]
        public string Username { get; set; }
        [Required]
        public string Department { get; set; }
        [Required]
        public string Details { get; set; }
        [Required]
        public DateTime DateOfComplaint { get; set; }
        [Required]
        public string Period { get; set; }
        [Required]
        public DateTime EndDate { get; set; }
    }

public class Requisitions_Sections
    {
        public Requisitions Requisitions { get; set; }
        [ForeignKey("Requisitions")]
        public int JobIDFK { get; set; }
        [Required]
        public string Section { get; set; }
    }

我正在尝试 map 这个外键到 requisition_sections class 但我收到此错误The entity type 'Requisitions_Sections' requires a primary key to be defined. If you intended to use a keyless entity type, call 'HasNoKey' in 'OnModelCreating'. For more information on keyless entity types, The entity type 'Requisitions_Sections' requires a primary key to be defined. If you intended to use a keyless entity type, call 'HasNoKey' in 'OnModelCreating'. For more information on keyless entity types,

我为此创建了单独的类。

在 mysql JobIDFK 和部分都应该是主键我不知道如何在 SQL 服务器中执行此操作，这有一对多的关系，一个 jobID 有很多部分。

任何帮助表示赞赏。

Answer 1

public class Requisitions
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int JobID { get; set; }
        [Required]
        public string JobNumber { get; set; }
        [Required]
        public string Username { get; set; }
        [Required]
        public string Department { get; set; }
        [Required]
        public string Details { get; set; }
        [Required]
        public DateTime DateOfComplaint { get; set; }
        [Required]
        public string Period { get; set; }
        [Required]
        public DateTime EndDate { get; set; }
    }

public class Requisitions_Sections
    {
        public Requisitions Requisitions { get; set; }
        [ForeignKey("Requisitions")]
        public int JobIDFK { get; set; }
        [Required]
        public string Section { get; set; }
    }

我正在尝试 map 这个外键到 requisition_sections class 但我收到此错误The entity type 'Requisitions_Sections' requires a primary key to be defined. If you intended to use a keyless entity type, call 'HasNoKey' in 'OnModelCreating'. For more information on keyless entity types, The entity type 'Requisitions_Sections' requires a primary key to be defined. If you intended to use a keyless entity type, call 'HasNoKey' in 'OnModelCreating'. For more information on keyless entity types,

我为此创建了单独的类。

在 mysql JobIDFK 和部分都应该是主键我不知道如何在 SQL 服务器中执行此操作，这有一对多的关系，一个 jobID 有很多部分。

任何帮助表示赞赏。