用C#编写程序，模拟从一副扑克牌中随机选取一张牌，显示牌的数值和花色，比如红心 A.

在C#中，我们可以使用`Random`类来生成随机数，并通过数组模拟一副扑克牌的结构。以下是一个简单示例，展示了如何随机选择一张牌并显示其数值和花色：

using System;
using System.Collections.Generic;

class Card
{
    public enum Suit { Hearts, Diamonds, Clubs, Spades }
    public enum Rank { Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Jack, Queen, King, Ace }

    public Suit suit { get; set; }
    public Rank rank { get; set; }

    public override string ToString()
    {
        switch (rank)
        {
            case Rank.Two:
                return "红心2";
            // ... 同样添加其他排至Ace的所有情况
        }
        return $"未知卡片（Suit: {suit}, Rank: {rank})";
    }
}

class PokerDeck
{
    private Card[] deck;

    public PokerDeck()
    {
        deck = new Card[52]; // 一副扑克有52张牌
        for (int i = 0; i < 4; i++)
        {
            for (int j = 0; j <= 12; j++) // 每种花色有13张牌
            {
                deck[i * 13 + j] = new Card { suit = (Suit)i, rank = (Rank)j };
            }
        }
    }

    public Card Draw()
    {
        Random random = new Random();
        return deck[random.Next(deck.Length)];
    }
}

class Program
{
    static void Main()
    {
        PokerDeck deck = new PokerDeck();
        Card drawnCard = deck.Draw();

        Console.WriteLine(drawnCard.ToString());
    }
}