using System;
namespace Lesson06
{
    [Serializable]
    public class ClassRoom
    {
        public string Name { get; set; }
        public string Code { get; set; }
        public ClassRoom()
        {
        }

        public ClassRoom(string name, string code)
        {
            this.Name = name;
            this.Code = code;
        }

        public void Display()
        {
            Console.WriteLine("Name: {0}, Code: {1}", Name, Code);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Collections;
using System.IO;

namespace Lesson06
{
    public delegate float Calculator(float x, float y);

    class MainClass
    {
        static event Calculator calEvent = null;

        public static void Main(string[] args)
        {
            List<ClassRoom> list = new List<ClassRoom>();
            list.Add(new ClassRoom("A", "A"));
            list.Add(new ClassRoom("C", "C"));
            list.Add(new ClassRoom("B", "B"));
            list.Add(new ClassRoom("E", "E"));
            list.Add(new ClassRoom("A", "A"));

            list.Sort((o1, o2) =>
            {
                return o1.Code.CompareTo(o2.Code);
            });

            foreach(ClassRoom c in list)
            {
                c.Display();
            }

            //Luu List object vao file.
            string filePath = "classroom.dat";
            using (Stream stream = File.Open(filePath, FileMode.Create))
            {
                var binaryFormatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                //foreach(ClassRoom c in list)
                //{
                //    binaryFormatter.Serialize(stream, c);
                //}
                binaryFormatter.Serialize(stream, list);
            }

            List<ClassRoom> list2 = new List<ClassRoom>();
            using (Stream stream = File.Open(filePath, FileMode.Open))
            {
                var binaryFormatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                list2 = (List<ClassRoom>)binaryFormatter.Deserialize(stream);
            }

            foreach(ClassRoom c in list2)
            {
                c.Display();
            }
        }

        static void Test()
        {
            Console.WriteLine("Hello World!");
            float x = 6.2f, y = 7.8f;
            float r1 = Add(x, y);
            float r2 = Sub(x, y);
            Console.WriteLine("r1 = {0}, r2 = {1}", r1, r2);

            //Bai 1: Tao 1 list -> Quan ly duoc cac function Add, Sub => duyet qua phan tu trong mang -> thuc thi lenh
            //Yeu cau: tat ca cac function -> cung kieu tham
            List<Calculator> list = new List<Calculator>();

            Calculator c1 = new Calculator(Add);
            //Calculator c2 = new Calculator(Sub);

            list.Add(c1);
            //list.Add(c2);
            list.Add(Sub);

            Calculator c3 = delegate (float x1, float y1) {
                return x1 * y1;
            };
            list.Add(c3);

            foreach (Calculator c in list)
            {
                Console.WriteLine("Ket qua: {0}", c(x, y));
            }

            //Chuc nang kha moi so vs Java (PHP).
            Calculator cal = Add;
            cal += Sub;
            cal += delegate (float x1, float y1) {
                Console.WriteLine("Tich: {0}", x * y);
                return x * y;
            };

            cal(x, y);

            //Gia lap event trong C#
            calEvent = Add;
            calEvent(x, y);

            //List
            ClassRoom classRoom = new ClassRoom("T2008A ABC", "T2008A");

            Hashtable hashtable = new Hashtable();
            hashtable.Add("fullname", "TRAN VAN DIEP");
            hashtable.Add("age", 32);
            hashtable.Add(classRoom.Code, classRoom);

            string name = (string)hashtable["fullname"];
            Console.WriteLine("fullname: {0}", name);

            ClassRoom cr = (ClassRoom)hashtable["T2008"];
            if (cr != null)
            {
                cr.Display();
            }

            //Nghiep vu: Xay dung chuong trinh quan ly thong tin sinh vien => tim kiem thong tin sinh vien theo rollno.
            //Hashtable quan ly du lieu => rollNo lam key => value: object sinh vien
        }

        public static float Add(float x, float y)
        {
            Console.WriteLine("Tong: {0}", x + y);
            return x + y;
        }

        public static float Sub(float x, float y)
        {
            Console.WriteLine("Hieu: {0}", x - y);
            return x - y;
        }
    }
}