非規範化表6.1

Question

我得到了許多對許多relashionship表，但其中一人是不正常的，這我得到這個錯誤：The specified association foreign key columns 'FLS_FIL_ID' are invalid. The number of columns specified must match the number of primary key columns.

的relashionship，我試圖要做的是在File和FlowStep之間，你可以看到它們是ICollections，但我沒有成功。

[Table("Controller.TB_FlowStep")] 
    public partial class FlowStep : Entity<int> 
    { 
     [StringLength(8)] 
     public string FLS_FLO_ID { get; set; } 

     [Key] 
     [Column(Order = 0)] 
     [DatabaseGenerated(DatabaseGeneratedOption.None)] 
     public int FLS_FIL_ID { get; set; } 

     [Key] 
     [Column(Order = 1)] 
     [DatabaseGenerated(DatabaseGeneratedOption.None)] 
     public int FLS_STE_ID { get; set; } 

     public DateTime FLS_TimeStamp { get; set; } 

     [Key] 
     [Column(Order = 2)] 
     [DatabaseGenerated(DatabaseGeneratedOption.None)] 
     public int FLS_STS_ID { get; set; } 

     public virtual Flow Flow { get; set; } 

     public virtual Step Step { get; set; } 

     public virtual StepStatus StepStatus { get; set; } 

     public virtual ICollection<File> File { get; set; } 
    } 

[Table("Controller.TB_File")] 
public partial class File 
{ 
    [Key] 
    public int FIL_Id { get; set; } 

    public DateTime FIL_Date { get; set; } 

    [Required] 
    [StringLength(1)] 
    public string FIL_Type { get; set; } 

    [Column(TypeName = "ntext")] 
    [Required] 
    public string FIL_Body { get; set; } 

    [StringLength(20)] 
    public string FIL_SQC { get; set; } 

    [StringLength(10)] 
    public string FIL_ENV { get; set; } 

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

而且我確實到目前爲止映射：

 modelBuilder.Entity<FlowStep>() 
      .HasMany(e => e.File) 
      .WithMany(e => e.FlowStep) 
      .Map(e => 
      { 
       e.MapLeftKey("FLS_FIL_ID"); 
       e.MapRightKey("FIL_ID"); 
       e.ToTable("TB_FlowStep"); 
      }); 

Answer 1

MapLeftKey需要PARAMS字符串數組因爲所有的外鍵的名稱。 MapLeftKey方法的簽名如下。

public ManyToManyAssociationMappingConfiguration MapLeftKey(
    params string[] keyColumnNames 
) 

引用自this msdn文檔。

嘗試指定在MapLeftKey方法調用所有的按鍵如下：

modelBuilder.Entity<FlowStep>() 
     .HasMany(e => e.File) 
     .WithMany(e => e.FlowStep) 
     .Map(e => 
     { 
      e.MapLeftKey("FLS_FIL_ID","FLS_STE_ID","FLS_STS_ID"); 
      e.MapRightKey("FIL_ID"); 
      e.ToTable("TB_FlowStep"); 
     });