如何过滤项目的子列表

Question

我想要一个List<Container>地方Container.Active == true,只给我containerObject.Items > 2.如何以这种方式过滤子列表？

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApplication1
{
    internal class Container
    {
        public List<int> Items { get; set; }
        public bool Active { get; set; }

        public Container(bool active, params int[] items)
        {
            Items = items.ToList();
            Active = active;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var containers = new List<Container> {new Container(true,1, 2, 3), new Container(false, 1,2,3,4,5,6), new Container(true,1,2,5,6,7,8,9,10)};
            var result = containers.Where(c => c.Active);

            foreach (var container in result)
            {
                foreach (var item in container.Items)
                {
                    Console.WriteLine(item);//I should not print any values less than two here
                }
            }
        }
    }
}

我不应该打印任何小于2的值.

Answer 1

试试这个:

var result = from container in containers.Where(c => c.Active)
             from item in container.Items
             where item > 2
             select container;

以标准形式:

var standard_result = containers
    .Where(container => container.Active && container.Items.All(i => i > 2))
    .SelectMany(con => con.Items);