Question

我试图检索ProjectCategories（子类别）列表和ProjectCategorie的类别，检索子列表。但我不知道如何获得分类。

Project project = ctx.Projecten.Include(p => p.ProjectCategories.Select(s => s.Sub.Select(su => su.Sub))).ToList().Find(p => p.ProjectId == projectId);

这些是域类，您可以看到我的ProjectCategorie中有一个Categorie：

public class ProjectCategorie
{
    public int ProjectCategorieId { get; set; }
    public double MinBedrag { get; set; }
    public double MaxBedrag { get; set; }
    public bool Aanpasbaar { get; set; }
    public bool AutoAanpasbaar { get; set; }

    public ProjectCategorie Super { get; set; }
    public List<ProjectCategorie> Sub { get; set; }
    public Project Project { get; set; }
    public Categorie Categorie { get; set; }
}

public class Categorie : BegrotingsPost
{

    public int CategorieId { get; set; }
    public string Beschrijving { get; set; }
    public double MinBedrag { get; set; }
    public double MaxBedrag { get; set; }

    public Begroting Begroting { get; set; }
    public BegrotingsPost Super { get; set; }
}

Answer 1

好的更新（误读了这个问题）......

Project project = ctx.Projecten
   .Include(p => p.ProjectCategories.Select(s => s.Sub.Select(su => su.Sub)))
   .Include(p => p.ProjectCategories.Select(s => s.Categorie))
   .Find(p => p.ProjectId == projectId)
   .ToList();

我可能也会在数据库中执行查找（可能会引入逻辑错误）。只需将ToList（）移动到查询的最后一行即可解决该问题。

在对象中包含多个对象[实体框架]

1 个答案: