linq聚合嵌套计数

问题描述

我有以下课程:

class Outer
{
   public ICollection<Inner> Inners
}

class Inner
{
    public ICollection<Inner> Inners
}

我想按外来者的数量排序，即按其内在者和嵌套内在者的总数计算.

I would like to order descending a list of outers by the total count of their Inners and nested Inners.

例如:

如果我有2个外部元素:第一个具有3个内部元素的集合，每个内部元素带有1个嵌套内部元素，则总数为5.

if i have 2 outers: the first has a collection of 3 inners, each with 1 nested inner then total is 5.

第二个具有例如2个内部的集合，每个内部有3个嵌套内部，然后总计数为2 + 3 + 3 = 8

the second has for example can have a collection of 2 inners, each with 3 nested inner thenthe total count is 2 + 3 + 3 = 8

因此，在返回的结果中，第二个示例应该是第一个示例.

therefor in the returned result the second example should be the first.

有人吗? :)

推荐答案

首先，构建一个递归方法以对Inner对象(包括其自身)中的内部对象进行计数:

First, build a recursive method to count the Inner objects inside a Inner object including itself:

public static int Count(Inner inner)
{
    var count = 1;
    if (inner.Inners != null && inner.Inners.Any())
       count += inner.Inners.Sum(x => Count(x));

    return count;
}

然后您可以订购:

var result = outers.OrderBy(o => o.Inners.Sum(i => Count(i)));

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