using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var filterIds = new int[] {1};

​

        var facilities1 = new List<int> {1, 3};

        var facilities2 = new List<int> {1, 2, 3};

        var facilities3 = new List<int> {1, 4};

        var temp = new List<int> {1, 2};

        var rooms = new List<Room>()

        {

            new Room() {Id = 1, Facilities = facilities1},

            new Room() {Id = 2, Facilities = facilities2},

            new Room() {Id = 3, Facilities = facilities3},

        };

        var roomsWithSelectedFacilities = rooms.Where(room => temp.All(x => room.Facilities.Contains(x)));

        foreach (var room in roomsWithSelectedFacilities)

        {

            Console.WriteLine(room.Id);

        }

    }

}

​

public class Room

{

    public int Id { get; set; }

    public List<int> Facilities { get; set; }

}

​

public class Facility

{

    public int Id { get; set; }

    public string Name {get;set;}

}

​

​