Link Video Bài Giảng

#Program.cs

using System;
using System.Collections.Generic;

namespace Lesson06
{
    delegate void ShowMsg(string msg);

    class Program
    {
        static void Main(string[] args)
        {
            //Test01();
            Test02();
        }

        static void Test02()
        {
            //Phan 1: Anonymous methods
            ShowMsg showMsg = delegate (string msg)
            {
                Console.WriteLine("Hello >> " + msg);
            };
            showMsg("ABC");

            showMsg = (string msg) =>
            {
                Console.WriteLine("Hello >> " + msg);
            };
            showMsg("ABC");

            showMsg = (msg) =>
            {
                Console.WriteLine("Hello >> " + msg);
            };
            showMsg("ABC");

            showMsg = (msg) => Console.WriteLine("Hello >> " + msg);
            showMsg("ABC");

            //Phan 2: extension methods
            string s = "Sinh vien Aptech 54 Le Thanh Nghi";
            int wordNum = s.CountWords();//Dem so tu trong 1 string
            Console.WriteLine("So tu trong string: " + wordNum);

            //Phan 3: anonymous types
            var std = new Student();
            std.ShowMsg();

            var obj = new { fullname = "Tran Van A", age = 32, address = "Ha Noi" };
            Console.WriteLine("Fullname: " + obj.fullname);

            //Phan 4: Partial
            Student student = new Student();
            student.Email = "a@gmail.com";
            student.Fullname = "ABC";
        }

        static void Test01()
        {
            List<int> list1 = new List<int>();
            list1.Add(1);
            list1.Add(3);
            list1.Add(5);

            List<string> list2 = new List<string>();
            list2.Add("2312");
            list2.Add("sdfsdfsdf");
            list2.Add("sdf34534");

            //List<int> & List<string> => May class object => 1 class object.
        }
    }
}

#ExtensionString.cs

using System;
namespace Lesson06
{
    static public class ExtensionString
    {
        static public int CountWords(this string s)
        {
            s = s.Trim();
            string[] elements = s.Split(" ");
            return elements.Length;
        }
    }
}

#Student.cs

using System;
namespace Lesson06
{
    public partial class Student
    {
        public string Fullname { get; set; }
        public string RollNo { get; set; }

        public Student()
        {
        }

        public void ShowMsg()
        {
            Console.WriteLine("Testing ...");
        }
    }
}

#Student01.cs

using System;
namespace Lesson06
{
    public partial class Student
    {
        public string Email { get; set; }

        public Student(string fullname, string rollNo, string email)
        {
            Fullname = fullname;
            RollNo = rollNo;
            Email = email;
        }
    }
}