Question

EF 6
我有以下POCO的

_

public class StructureEntity : EmEntityBase
{
    [ForeignKey("ParentStructureId")]
    public virtual StructureEntity ParentStructure { get; set; }

    public long? ParentStructureId { get; set; }

    [ForeignKey("SiteId")]
    public virtual SiteEntity Site { get; set; }

    [Required(ErrorMessage = "Required.")]
    public long SiteId { get; set; }

    [Required(ErrorMessage = "Required.")]
    public string Name { get; set; }
}

public class SiteEntity : EmEntityBase
{
    [ForeignKey("ParentSiteId")]
    public virtual SiteEntity ParentSite { get; set; }

    public long? ParentSiteId { get; set; }

    [Required(ErrorMessage = "Required.")]
    public long ClientId { get; set; }

    [ForeignKey("ClientId")]
    public ClientEntity Client { get; set; }

    [Required(ErrorMessage = "Required.")]
    public string Name { get; set; }
}

public class ClientEntity : EmEntityBase
{
    public long? ParentClientId { get; set; }

    [ForeignKey("ParentClientId")]
    public virtual ClientEntity ParentClient { get; set; }

    public string Name { get; set; }
}

现在，当我想急切加载所有引用的实体时。要做到这一点，我有：

    public IQueryable<StructureDivisionEntity> GetAllWithInclude()
   {
   return GetAll()
         .Include(e => e.Structure)
         .Include(e => e.ParentStructureDivision.Structure)
         .Include(e => e.Structure.Site.Client);
   }

我想知道是否有一种动态的方法可以做到这一点，而无需明确地执行.Include（Structure）等。有类似的事情：

MyEntity.IncludeAllReferenced（）其中IncludeAllReferenced使用反射或类似物来遍历MyEntity并执行所有包含？

更新：查询复杂图表的替代方法

Answer 1

你不能这样做，但你可以做一个扩展方法来获得所有。这可能是一个疯狂的想法，但您可以创建一个通用的扩展方法来处理所有类型，以使代码更加干净。

示例，（如果需要，可以使用工厂模式对其进行扩展）：

public static IQueryable<T> IncludeAll<T>(this IQueryable<T> query)
{
   if (typeof(T) == typeof(StructureDivisionEntity))
   {
       return GetAllWithInclude(query);
   }
   throw new NotImplementedException("IncludeAll not implemented for type {0}",typeof(T).FullName);
}

private static IQueryable<StructureDivisionEntity> GetAllWithInclude<StructureDivisionEntity> (IQueryable<StructureDivisionEntity> query) 
{
   return query.Include(e => e.Structure)
               .Include(e => e.ParentStructureDivision.Structure)
               .Include(e => e.Structure.Site.Client);
}

如何在Entity Framework中动态加载所有引用的实体

1 个答案: