tt1q2_29m.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Xml.Serialization;

namespace Quiz29March
{

    public class Person
    {
        private string _name;
        private List<string> _messages = new List<string>();

        public Person(){}
        
        public Person(string name)
        {
            _name = name;
        }

        public string Name
        {
            get => _name;
            set => _name = value;
        }

        public List<string> Messages
        {
            get => _messages;
            set => _messages = value;
        }

        public void SendMessage(Person person, string message)
        {
            Messages.Add("Me: " + message);
            person.Messages.Add(_name + ": " + message);
        }

        public void SerializeToXmlFile(string fileName)
        {
            XmlSerializer serializer = new XmlSerializer(typeof(Person));
            using (Stream stream = new FileStream(fileName, FileMode.Create))
            {
                serializer.Serialize(stream, this);
            }
        }

        public static Person DeserializeFromXmlFile(string fileName)
        {
            XmlSerializer serializer = new XmlSerializer(typeof(Person));
            using (Stream stream = new FileStream(fileName, FileMode.Open))
            {
                return (Person) serializer.Deserialize(stream);
            }
        }

        public override string ToString()
        {
            string result = "Person:{\n" +
                            "    Name: " + _name + "\n" +
                            "    Messages: [\n";

            foreach (string message in Messages)
            {
                result += "        \"" + message + "\"\n";
            }

            result += "    ]\n";
            result += "}";

            return result;
        }
    }

    class Task1
    {
        static void Main(string[] args)
        {
            Person person = new Person("Person1");
            Person person1 = new Person("Person2");
            Person person2 = new Person("Person3");
            
            person.SendMessage(person1, "Hello!");
            person1.SendMessage(person, "Hi!");
            person2.SendMessage(person, "Hi guys!");
            person2.SendMessage(person1, "Hi guys!");
            
            person.SendMessage(person1, "How are you, Person1?");
            person1.SendMessage(person, "I'm a little bit crazy, cause " +
                                         "I'm talking with an instance of the class with 3 methods and 2 fields");
            person2.SendMessage(person, "Yeah, it's really strange");
            person2.SendMessage(person1, "Yeah, it's really strange");
            
            person.SendMessage(person1, "Goodbye!");
            
            person.SerializeToXmlFile("person.xml");
            person1.SerializeToXmlFile("person1.xml");
            person2.SerializeToXmlFile("person2.xml");
            
            Console.WriteLine(Person.DeserializeFromXmlFile("person.xml"));
        }
    }
}