Hotel.cs

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

namespace AlgorithmsRetakeExam
{
	public class Hotel
	{
        private string name;
        private List<Dog> dogs;

        public Hotel()
        {

        }

        public Hotel(string name)
        {
            Name = name;
            Dogs = new List<Dog>();
        }

        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }

        public List<Dog> Dogs
        {
            get
            {
                return dogs;
            }
            set
            {
                dogs = value;
            }
        }

        public void AddDog(string name, int age)
        {
            Dog dog = new Dog(name, age);
            Dogs.Add(dog);
        }

        public double AverageAge()
        {
            double sum = 0;
            int count = 0;
            foreach (Dog dog in Dogs)
            {
                sum += dog.Age;
                count++;
            }

            return sum / count;
        }

        public List<string> FilterDogsByAge(int age)
        {
            List<string> dogs = new List<string>();
            foreach (Dog dog in Dogs)
            {
                if (dog.Age < age)
                {
                    dogs.Add(dog.Name);
                }
            }
            return dogs;
        }

        public List<Dog> SortAscendingByName()
        {
            List<Dog> sorted = Dogs.OrderBy(dog => dog.Name).ToList();
            Dogs = sorted;
            return sorted;
        }

        public List<Dog> SortDescendingByAge()
        {
            List<Dog> sorted = Dogs.OrderByDescending(dog => dog.Age).ToList();
            Dogs = sorted;
            return sorted;
        }

        public bool CheckDogIsInHotel(string name)
        {
            foreach (Dog dog in Dogs)
            {
                if (dog.Name == name)
                {
                    return true;
                }
            }

            return false;
        }

        public string[] ProvideInformationAboutAllDogs()
        {
            List<string> infoList = new List<string>();
            foreach (Dog dog in Dogs)
            {
                infoList.Add(dog.ToString());
            }
            return infoList.ToArray();
        }
    }
}