[C#] 클래스 (base, sealed, 확장 매서드, 튜플)

190730 - 4 - 클래스

---

 

base : 부모 클래스

sealed : 상속 불가능

 

 

확장 매서드

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using MyExten;

namespace MyExten

{

    public static class IntExtension

    {

        public static int Square(this int myInt)

        {

            return myInt * myInt;

        }

        public static int Power(this int myInt, int exponent)

        {

            int result = myInt;

            for (int i = 1; i < exponent; i++)

            {

                result = result * myInt;

            }

            return result;

        }

        public static string Append(this string str, string addStr)

        {

            return str + addStr;

        }

    }

}

 

namespace ExtentionMethod

{

    class Program

    {

    

        static void Main(string[] args)

        {

            Console.WriteLine($"3^2 : {3.Square()}");

            Console.WriteLine($"3^4 : {3.Power(4)}");

            Console.WriteLine($"3^10 : {3.Power(10)}");

            Console.WriteLine($"3^10 : {3.Power(10)}".Append(" 붙임"));

        }

    }

}

3^2 : 9

3^4 : 81

3^10 : 59049

3^10 : 59049 붙임

 

튜플 설치

Install-Package "System.ValueTuple"

 

튜플 사용

static void Main(string[] args)

{

    var a = ("슈퍼맨", 9999);

    Console.WriteLine($"{a.Item1}, {a.Item2}");

 

    var b = (Name: "인간", Age: 25);

    Console.WriteLine($"{b.Name}, {b.Age}");

 

    var (name, age) = b;

    Console.WriteLine($"{name}, {age}");

 

    b = a;

    Console.WriteLine($"{b.Name}, {b.Age}");

}