LINQ -集合内部的筛选器集合

Question

假设我有以下类：

class Parent
{
    bool Gender { get; set; }
    List<Child> Children { get; set; }
}


class Child
{
    bool Gender { get; set; }
    List<Child> GrandChildren { get; set; }
}


class GrandChild
{
    bool Gender { get; set; }
}

使用linq，是否有人可以帮助我通过返回一个List<Child>来过滤父对象，其中每个子对象都有Gender == false，每个子对象的GrandChild都有Gender == false

我设法返回了一个List<GrandChild>，但我真的需要维护层次结构。

Answer 1

你的问题有点含糊。这是一个重建子代和孙辈列表的解决方案，我不确定是否需要child.GrandChildren.All(gc => !gc.Gender)，所以为了清楚起见，我省略了它：

parents.Select(parent => new Parent
{
  Gender = parent.Gender,
  Children = parent.Children.Where(child => !child.Gender).Select(child => new Child
    {
      Gender = false,
      GrandChildren = child.GrandChildren.Where(gc => !gc.Gender).ToList()
    }
  ).ToList()
})

Answer 2

你要找的是

.Where(p => p.Children.All(c => !c.Gender && c.GrandChildren.All(g => !g.Gender))

Answer 3

• help me filter a Parent object
• by returning a List<Child>
• where each
• has Gender == false
• and each Child's GrandChild has Gender == false?

按字面意思翻译：

List<Child> results =
(
  from c in theParent.Children
  where !c.Gender
  where c.GrandChildren.Any(gc => !gc.Gender)
  select c
).ToList()

根据你的评论，你真正想要的是：

List<Parent> result = 
(
from p in Parents
where !p.Gender
select new Parent()
{
  Gender = p.Gender,
  Children = 
  (
    from c in p.Children
    where !c.Gender
    select new Child()
    {
      Gender = c.Gender,
      GrandChildren =
      (
        from gc in c.GrandChildren
        where !gc.Gender
        select new GrandChild()
        {
          Gender = gc.Gender
        }
      ).ToList()
    }
  ).ToList()
}).ToList();