Collections EF 5，一对多，多表

我在以下课程中遇到了一些问题：

public class TwoVariableDetails
{
    public TwoVariableDetails()
    {    
        MovementsPerBlocks = new HashSet<MovementsRow>();
        MovementsPerShiftTypes = new HashSet<MovementsRow>();
        MovementsPerMachines = new HashSet<MovementsRow>();
        MovementsPerShifts = new HashSet<MovementsRow>();
    }

    [Key]
    public Guid TwoVariableDetailsId { get; set; }

    [Required]
    [MaxLength(50)]
    public string Name { get; set; }

    [Required]
    [MaxLength(1000)]
    [DataType(DataType.MultilineText)]
    public string Description { get; set; }        

    public virtual ICollection<MovementsRow> MovementsPerBlocks { get; set; }
    public virtual ICollection<MovementsRow> MovementsPerShiftTypes { get; set; }
    public virtual ICollection<MovementsRow> MovementsPerMachines { get; set; }
    public virtual ICollection<MovementsRow> MovementsPerShifts { get; set; }      

}

[Table("Movement")]
public class MovementsRow
{
    public MovementsRow()
    {
        MovementsCells = new HashSet<MovementsCell>();
    }
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    [CsvField(Ignore = true)]
    public Guid MovementId { get; set; }

    [Required]
    public int RowNo { get; set; }

    [Required]
    [CsvField(Ignore = true)]
    public Guid ModelId { get; set; }

    [ForeignKey("ModelId")]
    [CsvField(Ignore = true)]
    public virtual TwoVariableDetails Model { get; set; }

    [TypeConverter(typeof(MovementsCellTypeConverter))]
    public virtual ICollection<MovementsCell> MovementsCells { get; set; }

}

[Table("MovementCell")]
public class MovementsCell
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    [CsvField(Ignore = true)]
    public Guid CellId { get; set; }

    [Required]
    public int ColumnNo { get; set; }

    [Required]
    public int Count { get; set; }

    [Required]
    [CsvField(Ignore = true)]
    public Guid MovementId { get; set; }

    [ForeignKey("MovementId")]
    [CsvField(Ignore = true)]
    public virtual MovementsRow Model { get; set; }
}

声明已终止

这是我用于保存的代码：

twoVariableDetails.TwoVariableDetailsId = Guid.NewGuid();
_context.TwoVariableDetailsModels.Add(twoVariableDetails);
_context.SaveChanges();

我的桌子看起来像这样：

Movement
    - Column    
        - MovementId
        - RowNo
        - ModelId(FK, uniqueidentifier, not null)
        - TwoVariableDetails_TwoVariableDetailsId(FK, uniqueidentifier, null)
        - TwoVariableDetails_TwoVariableDetailsId2(FK, uniqueidentifier, null)
        - TwoVariableDetails_TwoVariableDetailsId3(FK, uniqueidentifier, null)
        - TwoVariableDetails_TwoVariableDetailsId4(FK, uniqueidentifier, null)
    - Keys
        - FK_dbo.Movement_dbo.TwoVariableDetails_ModelId
        - FK_dbo.Movement_dbo.TwoVariableDetails_TwoVariableDetails_TwoVariableDetailsId
        - FK_dbo.Movement_dbo.TwoVariableDetails_TwoVariableDetails_TwoVariableDetailsId1
        - FK_dbo.Movement_dbo.TwoVariableDetails_TwoVariableDetails_TwoVariableDetailsId2
        - FK_dbo.Movement_dbo.TwoVariableDetails_TwoVariableDetails_TwoVariableDetailsId3

---

我不确定我的方法有什么问题。我是否应该将MovementsRow类更改为具有四个模型属性和四个modelid fk，然后使用InverseProperty属性？

MovementsRow.Model

属于另一个关系，而不是

TwoVariableDetails

中的四个集合。这就是为什么数据库表中没有四个外键，只有五个外键的原因。当您将

twoVariableDetails

插入数据库，并且其中一个集合中包含一个

MovementRow

实例时，EF希望其

ModelId

设置为引用现有

twoVariableDetails

行的Guid，而它显然不这样做。因此有例外

我是否应该将MovementsRow类更改为具有四个模型属性 和四个modelid fk，然后使用InverseProperty属性

---

我会同意的。这可能是最好的解决办法。另一种选择是在

MovementRow

中根本没有

Model

属性。它正在工作，但您将无法从

MovementRow

导航到

TwoVariableDetails

。

您的

FK\u dbo.Movement\u dbo.TwoVariableDetails\u ModelId

被违反，简单地说，

Movement

记录使用的

ModelId

在

twovabledetails

中还不存在

如果您希望保持它的简单性和事务性，那么您可以与数据库上下文一起使用，首先在事务中保存

TwoVariableDetails

，然后保存与之相关的记录：

using (var context = new MyDbContext())
using (var tranScope = new TransactionScope(TransactionScopeOption.Required) {
  // don't save the Movement records yet
  twoVariableDetails.TwoVariableDetailsId = Guid.NewGuid();
  _context.TwoVariableDetailsModels.Add(twoVariableDetails);
  _context.SaveChanges();

 // now create the movement records, add them to twoVariableDetails
  ...
  _context.SaveChanges();

 // commit the transaction
 scope.Complete();
}

using (var context = new MyDbContext())
using (var tranScope = new TransactionScope(TransactionScopeOption.Required) {
  // don't save the Movement records yet
  twoVariableDetails.TwoVariableDetailsId = Guid.NewGuid();
  _context.TwoVariableDetailsModels.Add(twoVariableDetails);
  _context.SaveChanges();

 // now create the movement records, add them to twoVariableDetails
  ...
  _context.SaveChanges();

 // commit the transaction
 scope.Complete();
}