XdDD

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;

namespace Zad1
{
    static class Serialzator
    {
        public static void Serialize<T>(string FileName, T obj)
        {
            if (obj is ISerializable)
            {
                Stream stream = File.Create(FileName);
                File.Open(FileName,FileMode.Open);
                BinaryFormatter bf = new BinaryFormatter();
                bf.Serialize(stream, obj);
                stream.Close();
            }

        }


        public static T Deserialize<T>(string FileName)
        {
            Stream stream = File.Open(FileName, FileMode.Open);

            BinaryFormatter bf = new BinaryFormatter();

            T obj = (T)bf.Deserialize(stream);

            stream.Close();

            return obj;
        }
    }
    [Serializable]
    class Notatka : IComparable<Notatka>, ISerializable
    {
        string tekst,temat;

        public Notatka()
        {
            tekst = "";
            temat = "";
        }

        public Notatka(string tekst, string temat)
        {
            this.tekst = tekst;
            this.temat = temat;
        }

        public override string ToString()
        {
            return $"Notatka: {temat} treść: {tekst}";
        }

        public void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            info.AddValue("tekst",tekst);
            info.AddValue("temat",temat);
        }

        public Notatka(SerializationInfo info, StreamingContext context)
        {
            temat = info.GetString("temat");
            tekst = info.GetString("tekst");
        }

        public int CompareTo(Notatka obj)
        {
            if (temat != obj.temat)
            {
                return temat.CompareTo(obj.temat);
            }
            else return tekst.CompareTo(obj.tekst);
        }

        public static bool operator ==(Notatka N1, Notatka N2)
        {
            return N1.CompareTo(N2) == 0 ? true : false;
        }
        public static bool operator !=(Notatka N1, Notatka N2)
        {
            return N1.CompareTo(N2) != 0 ? true : false;
        }


    }
    class Program
    {
        static void Main(string[] args)
        {
            Notatka n1 = new Notatka("bAudi","cPojazd");
            Notatka n2 = new Notatka("aBMW", "cPojazd");
            Notatka n3 = new Notatka("Mercedes", "dPojazd");
            Notatka n4 = new Notatka("Zuk", "ePojazd");
            Notatka n5 = new Notatka("Samsung", "bTelefon");
            Notatka n6 = new Notatka("Audi", "aPojazd");

            List<Notatka> n = new List<Notatka>(){n1,n2,n3,n4,n5,n6};

            foreach (var VARIABLE in n)
            {
                Console.WriteLine(VARIABLE);
            }
            n.Sort();
            Console.WriteLine("------------------");
            foreach (var VARIABLE in n)
            {
                Console.WriteLine(VARIABLE);
            }
            Serialzator.Serialize("xd.bin",n);
            foreach (var ZMIENNA in n)
            {
                Console.WriteLine(ZMIENNA);
            }

            Console.ReadKey();
        }
    }
}