iComparable 상속 받아서 int IComparable.CompareTo(object obj)써보기!

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            File.WriteAllText("C:\\factory.txt","factory");
        }
    }
}

 

 

c 드라이브에 권한이 걸려 있어서 물론 관리자 권한으로 실행해야한다. exe 

 

 

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp5
{
    public class Product : IComparable // i는 인터페이스의 약자 
    {
        public string name;
        public int price;
        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        public int Price
        {
            get { return price ; }
            set { price = value ; }
        }
        public override string ToString() //투스트링 메소드를 만들어서 다때려 박아서 출력 가능 
        {
            return Name + ":" + Price + "원" + "\n";
        }

        int IComparable.CompareTo(object obj)
        {

            //return Name.CompareTo((obj as Product).Name); //cast를 좀더 우아하게 
            return Price.CompareTo((obj as Product).Price); //cast를 좀더 우아하게 

        }
    }
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            List<Product> aList = new List<Product>() { 
                new Product(){Name ="고메" , Price =1000},
                new Product(){Name ="군고메" , Price =1300},
                new Product(){Name ="찐고메" , Price =1200},
                new Product(){Name ="짠고메" , Price =1600},
                new Product(){Name ="맛탕" , Price =1900},

            };
            aList.Sort();
            string result = "";
            
            foreach (var item in aList)
            {
                result = result + item;
            }
            MessageBox.Show(result);
            

        }
    }