Question

我有一个我不想改变的实体方法：

Listar方法

public virtual IEnumerable<T> Listar(
            Expression<Func<T, bool>> filter = null,
            Func<IQueryable<T>, IOrderedQueryable<T>> orderBy = null,
            string includeProperties = "")
        {
            IQueryable<T> query = _dbset;

            if (filter != null)
            {
                query = query.Where(filter);
            }

            foreach (var includeProperty in includeProperties.Split
                (new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
            {
                query = query.Include(includeProperty);
            }

            if (orderBy != null)
            {
                return orderBy(query).AsEnumerable<T>();
            }
            else
            {
                return query.AsEnumerable<T>();
            }
        }

我使用像

这样的查询

var vehiculo = _pService.Listar(x => x.TipoContenedor.CatalogosID.Equals("TCO"), includeProperties: "TipoContenedor").Select(x => x.TipoContenedor.Nombre);

表格

public class TipoVehiculo: Entidad<Int32>
    {
        [StringLength(255)]
        public string Nombre { get; set; }
        [StringLength(255)]
        public string CapacidadCarga { get; set; }

        [StringLength(255)]
        public string CapacidadCubica { get; set; }

        public int TipoContenedorID { get; set; }
        public CatalogoRegistro TipoContenedor { get; set; }
        public int EstatusID { get; set; }
        public Estatus Estatus { get; set; }

    }

问题是当我想使用select .Select(x => x.TipoContenedor.Nombre)时，因为当我尝试使用mapper的查询时：

  var vehiculo = _pService.Listar(x => x.TipoContenedor.CatalogosID.Equals("TCO"), includeProperties: "TipoContenedor").Select(x => x.TipoContenedor.Nombre);


  IEnumerable<TipoVehiculoViewModel> est = Mapper.Map<IEnumerable<TipoVehiculo>, IEnumerable<TipoVehiculoViewModel>>(vehiculo);

  response = request.CreateResponse<IEnumerable<TipoVehiculoViewModel>>(HttpStatusCode.OK, est);

我在vehiculo中收到错误说：

参数类型System.Collection.Generic.IEnumerable不是可分配给参数类型 System.Collections.Generic.IEnumerable

如果只发送INNERJOIN的表格列，我需要做什么？

注意：那个innerjoin是因为我使用了TipoContenedor的include属性，所以EF将它解释为与该表的内连接。

查询

SELECT 
[Extent1].[ID] AS [ID], 
[Extent1].[Nombre] AS [Nombre], 
[Extent1].[CapacidadCarga] AS [CapacidadCarga], 
[Extent1].[CapacidadCubica] AS [CapacidadCubica], 
[Extent1].[TipoContenedorID] AS [TipoContenedorID], 
[Extent1].[EstatusID] AS [EstatusID], 
[Extent2].[ID] AS [ID1], 
[Extent2].[Codigo] AS [Codigo], 
[Extent2].[Nombre] AS [Nombre1], 
[Extent2].[PadreID] AS [PadreID], 
[Extent2].[CatalogosID] AS [CatalogosID], 
[Extent2].[FechaCreacion] AS [FechaCreacion], 
[Extent2].[UsuarioCreacionID] AS [UsuarioCreacionID], 
[Extent2].[FechaModificacion] AS [FechaModificacion], 
[Extent2].[UsuarioModificacionID] AS [UsuarioModificacionID], 
[Extent2].[EstatusRegistro] AS [EstatusRegistro]
FROM  [adm].[TiposVehiculo] AS [Extent1]
INNER JOIN [adm].[Catalogos_Registros] AS [Extent2] ON [Extent1].[TipoContenedorID] = [Extent2].[ID]
WHERE N'TCO' = [Extent2].[CatalogosID]

我想要的列是[Extent2].[Nombre] AS [Nombre1]，来自innerjoin子句

无法将字符串与IEnumerable Collection进行比较

0 个答案: