实体框架核心 - 在列表

Question

如何在Entity Framework Core 2.0.1查询中包含内部列表（位于另一个列表中）？

这是我尝试过的但没有成功：

clase = repClase.ListQueryable(
    //Specification
    new ApplicationCore.Specifications.ClaseFilterByIdAndIdArticuloWithIncludesSpecification(idClase, idArticuloParam)
)
.Include(c => c.ReferenciasConstructor)
.ThenInclude(rc => rc.Select(rc1 => rc1.ReferenciaFabricanteTieneReferenciaConstructor))
.FirstOrDefault();

它抛出的错误： “属性表达式'rc =＆gt; {来自rc select [rc1] .ReferenciaFabricanteTieneReferenciaConstructor}中的ReferenciaConstructor rc1'无效。表达式应代表属性访问：'t =＆gt; t.MyProperty'。”。

类：

[Table("Clases", Schema = "public")]
public class Clase
{

    ...

    [InverseProperty("Clase")]
    public IList<ReferenciaConstructor> ReferenciasConstructor { get; set; }

}

[Table("ReferenciasConstructor", Schema = "public")]
public class ReferenciaConstructor
{

    [Key]
    public int Id { get; set; }

    ...

    //JOIN TABLE
    [InverseProperty("ReferenciaConstructor")]
    public IList<ReferenciaFabricanteTieneReferenciaConstructor> ReferenciaFabricanteTieneReferenciaConstructor { get; set; }

}


//JOIN TABLE
[Table("ReferenciaFabricanteTieneReferenciaConstructor", Schema = "public")]
public class ReferenciaFabricanteTieneReferenciaConstructor {

    [Key]
    public int IdReferenciaFabricante { get; set; }

    [ForeignKey("IdReferenciaFabricante")]
    public ReferenciaFabricante ReferenciaFabricante { get; set; }

    [Key]
    public int IdReferenciaConstructor { get; set; }

    [ForeignKey("IdReferenciaConstructor")]
    public ReferenciaConstructor ReferenciaConstructor { get; set; }
}

Answer 1

您无法使用Include来选择目的。只需select所需的属性。

clase = repClase.ListQueryable(
        //Specification
        new ApplicationCore.Specifications.ClaseFilterByIdAndIdArticuloWithIncludesSpecification(idClase, idArticuloParam)
    )
    .Include(c => c.ReferenciasConstructor)
    .SelectMany(rc => rc.ReferenciasConstructor.Select(rc1 => rc1.ReferenciaFabricanteTieneReferenciaConstructor))
    .FirstOrDefault();