[Code Review] Team 05 - Hw04

//Form1.cs
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 HW4
{
    public partial class Form1 : Form
    {
        CardDeck mydeck = new CardDeck();

        public Form1()
        {
            InitializeComponent();
            mydeck.CreateDeck();
            mydeck.ResetDeck();
        }


        private void btn_combobox_Click(object sender, EventArgs e)
        {
            
            switch (CBox_select.SelectedIndex)
            {
                case 0:
                    mydeck.ResetDeck();
                    txt_display.AppendText("combobox按花色牌列已被選定"+'\n');
                    messageshow();
                    break;
                case 1:
                    mydeck.Shuffle();
                    txt_display.AppendText("combobox亂數洗牌已被選定" + '\n');
                    messageshow();
                    break;
                case 2:
                    mydeck.resetbyrank();
                    txt_display.AppendText("combobox按點數大小排列已被選定" + '\n');
                    messageshow();
                    break;
                default:
                    txt_display.AppendText("未選擇方法!!" + '\n');
                    break;
            }
        }

        private void btn_checkbox_Click(object sender, EventArgs e)
        {
            if (checkBox_select1.Checked)
            {
                mydeck.ResetDeck();
                txt_display.AppendText("checkBox按花色牌列已被選定" + '\n');
                messageshow();
            }
            if (checkBox_select2.Checked)
            {
                mydeck.Shuffle();
                txt_display.AppendText("checkBox亂數洗牌已被選定" + '\n');
                messageshow();
            }
            if (checkBox_select3.Checked)
            {
                mydeck.resetbyrank();
                txt_display.AppendText("checkBox按點數大小排列已被選定" + '\n');
                messageshow();
            }
        }


        private void messageshow()
        {
            string str=null;
            for (int i=0; i < 52; i++)
            {
                str += mydeck.Cards[i].SuitToUni();
                str += mydeck.Cards[i].RankToStr();
                str += "  ";
                if (i % 13 == 12)
                    str += '\n';
            }
            MessageBox.Show(str);
        }
       
 
        
    }
}

//CardDeck.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HW4
{
    class CardDeck
    {
        public PokerCard[] Cards = new PokerCard[52];

        public void CreateDeck()
        {
            int i;
            for (i = 0; i < 52; i++)
                Cards[i] = new PokerCard();
        }

        public void ResetDeck() //牌堆回復原始狀態
        {
            int i ;
            for (i = 0; i < 52; i++)
            {
                Cards[i].Suit = i/13+3;
                Cards[i].Rank = i%13+1;
            }
        }

        public void Shuffle() //洗牌
        {
            Random rand = new Random();
            for (int i = 0; i < 52; i++)
            {
                int n1 = rand.Next(52);
             
                PokerCard temp = Cards[i];
                Cards[i] = Cards[n1];
                Cards[n1] = temp;
            }
        }

        public void resetbyrank()
        {
            int i;
            for (i = 0; i < 52; i++)
            {
                Cards[i].Suit = i % 4 + 3;
                Cards[i].Rank = i / 4 + 1;
            }
        }

    }
}

//PokerCard.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HW4
{
    class PokerCard
    {
        public int Suit;  
        public int Rank;
        public string RankToStr()
        {
            switch (Rank)
            {
                case 1:
                    return "A";
                case 11:
                    return "J";
                case 12:
                    return "Q";
                case 13:
                    return "K";
                default:
                    return Convert.ToString(Rank);
            }
        }

        public char SuitToAscii()
        {
            return Convert.ToChar(Suit);
        }

        public string SuitToUni()
        {
            switch (Suit)
            {
                case 3:
                    return "\u2665";
                case 4:
                    return "\u2666";
                case 5:
                    return "\u2663";
                case 6:
                    return "\u2660";
                default:
                    return " ";
            }
        }

    }
}