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[Share Code] Tìm hiểu generic C#, Anonymous method C#, extension method C#, anonymous type C#, partial type C#, nullable type C# - C2009G

#Program.cs

using System;
using System.Collections.Generic;

namespace Lesson07
{
    class Program
    {
        static void Main(string[] args)
        {
            //Generic
            //Test01();

            //Anonymous method, extension method, anonymous type, partial type, nullable type
            Test02();
        }

        interface IRunning
        {
            void OnRunning();
        }

        class People : IRunning
        {
            public void OnRunning()
            {
                Console.WriteLine("Test interface ...");
            }
        }

        delegate void OnRunning();

        static void Test02()
        {
            //Phan 1: Anonymous method
            People people = new People();
            people.OnRunning();

            //Lam sao de tao dc anonymous -> method anonymous.
            OnRunning running = delegate ()
            {
                Console.WriteLine("Test delegate interface ...");
            };
            running();

            running = () =>
            {
                Console.WriteLine("Test delegate interface ...");
            };
            running();

            running = () => Console.WriteLine("Test delegate interface ...");
            running();

            //Phan 2: Extension method
            string s = "Sinh vien Aptech 54 Le Thanh Nghi";
            int length = s.Length;
            Console.WriteLine("So ky tu: " + length);

            int words = s.CountWords();
            Console.WriteLine("So tu: " + words);

            //Phan 3: Anonymous type
            Student std = new Student();
            std.ShowInfo();

            var student = new Student();
            student.ShowInfo();

            var p = new {fullname="Tran Van A", age=22, gender="Nam"};
            Console.WriteLine("fullname: " + p.fullname);

            //Phan 4: Partial
            Teacher teacher = new Teacher();
            teacher.Input();
            teacher.Display();

            //Phan 5: nullable
            DateTime? dateTime = null;
            dateTime = DateTime.Now;

            Char? c = null;
            c = 'A';

            Char c2;

            Teacher t = null;
            t = new Teacher();

            Abc? abc = null;
            abc = new Abc();
            abc?.ShowInfo();
        }

        static void Test01()
        {
            List<int> list1 = new List<int>();
            list1.Add(12);
            list1.Add(32);
            list1.Add(55);
            //B2. Tai sao list1.Add("2dasdas") => Error

            List<string> list2 = new List<string>();
            list2.Add("2dasdas");
            list2.Add("sdsad232");
            list2.Add("sddsfsdfds");
            //B2. Tai sao list2.Add(55) => Error
            //B2. Check thi 2 ham nay la 1.

            //B1. Cau hoi 1: List<int> & List<string> => Tong bao nhieu class object => chi 1 class object
        }
    }

    //Extension method
    static class ExtensionString
    {
        public static int CountWords(this string str)
        {
            str = str.Trim();
            string[] elements = str.Split(" ");
            return elements.Length;
        }
    }

    class Student
    {
        public void ShowInfo()
        {
            Console.WriteLine("testing ...");
        }
    }

    public readonly struct Abc
    {
        public void ShowInfo()
        {
            Console.WriteLine("testing ...");
        }
    }
}

#Teacher.cs

using System;
namespace Lesson07
{
    public partial class Teacher
    {
        public string Fullname { get; set; }
        public string Gender { get; set; }

        public Teacher()
        {
        }

        public void Display()
        {
            Console.WriteLine("Hien thi thong tin du lieu");
        }
    }
}

#Teacher02.cs

using System;
namespace Lesson07
{
    public partial class Teacher
    {
        public string Email { get; set; }
        public int Exp { get; set; }

        public void Input()
        {
            Console.WriteLine("Nhap du lieu");
            Console.WriteLine("Nhap ten: ");
            Fullname = Console.ReadLine();
        }
    }
}