C# 洗牌发牌

using System;

namespace ConsoleApp1
{
    enum CardSuit { 
        Club,Diamond,Heart,Spades
    }
    enum CardFace
    {
        Ace=1,Two,Three,Four,Five,Six,Seven,Eight,Nine,Ten,Jack,Queen,king
    }
    struct CNode
    {
        public CardSuit cardSuit;
        public CardFace cardFace;
        public override string ToString()
        {
            string s = string.Empty;
            switch ((int)cardSuit)
            {
                case 0:
                    s += "梅花";
                    break;
                case 1:
                    s += "方块";
                    break;
                case 2:
                    s += "红心";
                    break;
                case 3:
                    s += "黑桃";
                    break;
            }
            switch ((int)cardFace)
            {
                case 1:
                    s += "A";
                    break;
                case 11:
                    s += 'J';
                    break;
                case 12:
                    s += 'Q';
                    break;
                case 13:
                    s+= 'K';
                    break;
                default:
                    s += ((int) cardFace).ToString();
                    break;
            }
            return s;
        } 
    }
    class Card
    {   
        //牌总数，牌数字总类
        public const int CARDNUMBER=52; 
        public const int FACENUMBER = 13;
        CNode []cnode = new CNode[CARDNUMBER];
        //构造方法
        public Card()
        {
            for(int i = 0; i < CARDNUMBER; i++)
            {
                cnode[i].cardFace = (CardFace)(i % FACENUMBER + 1);
                cnode[i].cardSuit = (CardSuit)(i / FACENUMBER); 
            }
        }
        //发牌
        public void Deliver()
        {
            Console.WriteLine("===========52张牌的发牌次序============");
            Console.WriteLine("\t东 \t 西 \t 南 \t 北");
            for (int i = 0; i < CARDNUMBER; i++)
            {
                Console.Write("第{0,2}张{1,3}\t", i + 1, cnode[i]);
                if ((i + 1) % 4 == 0)
                {
                    Console.WriteLine();
                }
            }
            Console.WriteLine();
        }
        //洗牌
        public void Shuffle()
        {
            Random r = new Random();
            for(int i = 0; i < CARDNUMBER; i++)
            {
                var j = r.Next(CARDNUMBER);
                var temp = cnode[i];
                cnode[i] = cnode[j];
                cnode[j] = temp;
            }
        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            Card card = new Card();
            Console.WriteLine("打牌开始");
            Console.WriteLine("洗牌");
            card.Shuffle();
            Console.WriteLine("发牌");
            card.Deliver();
            Console.ReadLine();
        }
    }
}