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我在stackoverflow上遇到了一些与我的here类似的问题，但它们看起来并没有深入到连接表中，而且我看不到任何适用于我的代码的东西，所以我希望有人可以查看我的代码位并告诉我为什么我得到

LINQ to Entities 不支持指定的类型成员“Locale_Section”。仅支持初始化程序、实体成员和实体导航属性。

        private object SetNavItems(string Category, byte CultureID)
    {
        using (var db = new Compleate())
        {
            return (from n in db.Navigation
                    where n.Category == Category && n.Section.Locale_Section.CultureID == CultureID
                    orderby n.Position
                    select new
                    {
                        n.Section.Locale_Section.Title,
                        n.Section.LinkAddress
                    }).ToList();
        }
    }

导航.cs

    [Table("Navigation")]
public class Navigation
{
    [Key, Required, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int NavigationID { get; set; }

    [Required, MaxLength(16), Column(TypeName = "varchar")]
    public string Category { get; set; }

    [Required]
    public Int16 SectionID { get; set; }

    [ForeignKey("SectionID")]
    public virtual Section Section { get; set; }

    [Required]
    public byte Position { get; set; }
}

截面.cs

    [Table("Section")]
public class Section
{
    [Key, Required, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Int16 SectionID { get; set; }

    public Int64 LogoFileID { get; set; }

    [ForeignKey("LogoFileID")]
    public virtual File File { get; set; }

    [Required, MaxLength(15), Column(TypeName = "varchar")]
    public string RouteName { get; set; }

    [Required, MaxLength(15), Column(TypeName = "varchar")]
    public string Type { get; set; }

    [NotMapped]
    public string LinkAddress
    {
        get
        {
            return Type + "/" + RouteName;
        }
    }

    [NotMapped]
    public virtual Locale_Section Locale_Section { get; set; }
}

Locale_Section.cs

    [Table("Locale_Section")]
public class Locale_Section
{
    [Key, Required, Column(Order = 0)]
    public Int16 SectionID { get; set; }

    [ForeignKey("SectionID")]
    public virtual Section Section { get; set; }

    [Key, Required, Column(Order = 1)]
    public byte CultureID { get; set; }

    [ForeignKey("CultureID")]
    public virtual Culture Culture { get; set; }

    [Required, MaxLength(250)]
    public string Title { get; set; }

    public string Synopsis { get; set; }
}
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1 回答 1

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您已将实体中的Section_Locale属性标记为。这意味着该属性对于您的映射是未知的，并且无法在 Linq-to-Entities 查询中转换为 SQL。如果不映射它或通过调用例如或首先将所有实例加载到您的应用程序，您就不能使用该属性（这很可能是非常糟糕的解决方案）。SectionNotMappedNavigationToListAsEnumerable

于 2013-03-01T08:25:22.103 回答