LINQ-集合内部的过滤器集合 [英] LINQ - filter collection inside collection

问题描述

假设我有以下课程:

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，谁能帮助我通过返回List<Child>来过滤一个Parent对象，其中每个子代都有Gender == false，每个子代的GrandChild都有Gender == false?

Using linq, can anyone help me filter a Parent object by returning a List<Child> where each Child has Gender == false and each Child's GrandChild has Gender == false?

我设法返回了List<GrandChild>，但是我确实需要维护层次结构.

I've managed to return a List<GrandChild> but I really need the hierarchy to be maintained.

推荐答案

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

Your question is a bit vague. Here's a solution which rebuilds the children and grandchildren lists, I wasn't sure if I needed the child.GrandChildren.All(gc => !gc.Gender) so I left it out for clarity:

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()
})

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