c# LINQ 加入两个列表

Question

我在尝试将两个列表与 LINQ 一起加入时正在战斗。

我得到了什么...

类(class)人:

class Person
{
    public string Name { get; private set; }
    public int Age { get; private set; }
    public bool Parent { get; private set; }
    public bool Child { get; private set; }
    public int Housenumber { get; private set; }

    public Person(string name, int age, bool parent, bool child, int housenumber)
    {
        Name = name;
        Age = age;
        Parent = parent;
        Child = child;
        Housenumber = housenumber;
    }
}

类(class)房子:

class House
{
    public int Housenumber { get; private set; }
    public int Rooms { get; private set; }
    public string Color { get; private set; }

    public House(int housenumber, int rooms, string color)
    {
        Housenumber = housenumber;
        Color = color;
        Rooms = rooms;
    }
}

人员名单:

private static List<Person> people = new List<Person>
    {
        new Person("Joel", 12, false, true, 1),
        new Person("jana", 22, false, false, 2),
        new Person("Housi", 45, true, false, 3),
        new Person("Kurt", 25, false, false, 4),
        new Person("Sebastian", 65, true, false, 1),
        new Person("George", 14, false, true, 2),
        new Person("Noel", 50, true, false, 3)
    };

以及房屋 list :

private static List<House> houses = new List<House>
    {
        new House(1, 4, "blue"),
        new House(2, 2, "red"),
        new House(3, 3, "black"),
        new House(4, 1, "violett")
    };

我想做的是创建一个包含“House”对象的新列表。
但只有那些至少有两个人住的房子!

我被困在这里:

var houseWithMorePeople = from house in houses
            join person in people
                on house.Housenumber equals person.Housenumber
            join person2 in people
                on person.Housenumber equals person2.Housenumber
            select house;

Answer 1

您可以简单地使用 Where和 Count像这样:

var result = houses
    .Where(h => people.Count(p => p.Housenumber == h.Housenumber) >= 2)
    .ToList();