"关系约束中的从属角色和主要角色中的属性数量必须相同"实体框架中的问题

Question

我正在使用.NET Framework 4.0和Entity Framework v6代码优先.

我正在创建使用复合主键的3个表(" Indicadores "," Campos "和" Codigos "),但是在生成模型时收到错误:

在模型生成期间检测到一个或多个验证错误:

Codigos_Campos_Target_Codigos_Campos_Source ::关系约束中的从属角色和主要角色中的属性数必须相同.

代码在这里:

public class Indicadores
{
    [Key, Column(Order = 0)]
    public Int32 Nro_Serie { get; set; }

    [MaxLength(31)]
    public string Nombre { get; set; }

    public List<Campos> campo { get; set; }
}

public class Codigos
{
    [Key, Column(Order = 0), DataType("nvarchar"), MaxLength(31)]
    public string Codigo {get;set;}

    [MaxLength(31)]
    public string Descripcion1 {get;set;}

    [MaxLength(31)]
    public string Descripcion2 {get;set;}

    public Int32 CantidadPesadas {get;set;}

    public Int32 PesoTotal {get;set;}

    [Key, Column(Order = 1)]
    public Int16 Nro_Campo { get; set; }

    [ForeignKey("Nro_Campo")]
    public Campos Campos { get; set; }    
}


public class Campos
{
    [Key, Column(Order = 0), DataType("smallint"), DatabaseGenerated(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.None)]
    public Int16 Nro_Campo {get;set;}

    [Required]
    public string Nombre {get;set;}

    public List<Codigos> codigo { get; set; }

    [Key, Column(Order = 1)]
    public Int32 Nro_Serie { get; set; }

    [ForeignKey("Nro_Serie")]
    public Indicadores Indicadores { get; set; }
} 

---

以前,我使用" Campos "和" Codigos "表没有错误; 当我包含" Indicadores "表时会出现问题.

知道怎么解决这个问题？

Answer 1

你正在配置错误的Campos和之间的一对多关系Codigos.从属的FK必须包含主PK的所有列.此外,您不需要在PK Indicadores实体中指定列顺序,您只有一个PK.你的模型是这样的:

public class Indicadores
{
    [Key]
    public Int32 Nro_Serie { get; set; }
    [MaxLength(31)]
    public string Nombre { get; set; }
    public List<Campos> campo { get; set; }
}

public class Codigos
{
    [Key]
    [Column(Order = 0)]
    [DataType("nvarchar")]
    [MaxLength(31)]
    public string Codigo { get; set; }
    [MaxLength(31)]
    public string Descripcion1 { get; set; }
    [MaxLength(31)]
    public string Descripcion2 { get; set; }
    public int CantidadPesadas { get; set; }
    public int PesoTotal { get; set; }

    [Key,ForeignKey("Campos"),Column(Order = 1)]
    public Int16 Nro_Campo { get; set; }

    [ForeignKey("Campos"), Column(Order = 2)]
    public Int32 Nro_Serie { get; set; }

    public Campos Campos { get; set; }
}

public class Campos
{
    [Key, Column(Order = 1)]
    [DataType("smallint")]
    [DatabaseGenerated(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.None)]
    public Int16 Nro_Campo { get; set; }
    [Required]
    public string Nombre { get; set; }
    public List<Codigos> codigo { get; set; }

    [Key, Column(Order = 2)]
    public Int32 Nro_Serie { get; set; }

    [ForeignKey("Nro_Serie")]
    public Indicadores Indicadores { get; set; }
} 

如您所见,我将Nro_SerieFK属性添加到,Codigos并且我更改Campos实体的PK中的顺序,以使它们与FK 的顺序相匹配Codigos.