C# 如何使用switch case语句将字母转换为数字

我正在制作一个black jack游戏，我需要使用switch case语句将a转换为11，将T、Q、J和K转换为10，但是我不确定如何执行代码。有人能帮我解决这个问题吗

到目前为止，我已经：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {

            Console.WriteLine("Welcome to Black Jack!\n");
            Console.WriteLine("Pick two cards to add to your hand\n");
            Console.WriteLine("Cards 2, 3, 4, 5, 6, 7, 8, 9 all are worth face value\n");
            Console.WriteLine("Ace (A) is worth 11,Ten (T), Jack (J), Queen (Q), and King (K) are all worth 10 points\n");
            Console.WriteLine("Whichever sum is higher, that player is declared the winner\n");
            Console.WriteLine("What are player one's cards?");
            Console.WriteLine("Enter card1 =?");
            Console.WriteLine("Enter card2 =?");
            double card1 = Double.Parse(Console.ReadLine());
            double card2 = Double.Parse(Console.ReadLine());
            Console.WriteLine("You entered: [" + card1, card2 + "]");
            Console.WriteLine("What are player two's cards?");
            Console.WriteLine("Enter card3 =?");
            Console.WriteLine("Enter card4 =?");
            double card3 = Double.Parse(Console.ReadLine());
            double card4 = Double.Parse(Console.ReadLine());
            Console.WriteLine("You entered: [" + card3, card4 + "]");
            Console.ReadLine();

             {

                Console.WriteLine("Calculate player 1: [" + "card1 + card2" + "]");
                Console.WriteLine("Calculate player 2: [" + "card3 + card4" + "]");
                {
                    if (card1 + card2 > card3 + card4)
                        Console.WriteLine("Player One Wins!");
                    else if (card3 + card4 > card1 + card2)
                        Console.WriteLine("Player Two Wins!");
                    Console.ReadLine();

---

有很多方法可以做到这一点，但我可能不会在这里使用开关，因为它会很冗长。这是一种方法：

int parseCard(char card)
{
    if (card >= '2' && card <= '9')
        return card - '0';
    if (card == 'T' || card == 'J' || card == 'Q' || card == 'K')
        return 10;
    if (card == 'A')
        return 11;
    throw new ArgumentException("card not valid", "card");
}

int-parseCard（字符卡）
{
如果（卡片>='2'&&card我不确定为什么开关会冗长

int parseCard(char card)
{
    if ( card >= '2' && card <= '9' ) {
        return card - '0';
    }

    switch ( card ) {
        case 'T':
        case 'J':
        case 'Q':
        case 'K':
            return 10;

         case 'A':
            return 11;

        default:
            throw new ArgumentException("card not valid", "card");
    }
}

int-parseCard（字符卡）
{
如果（card>='2'&&card给出了您的代码风格并使用了系统名称空间，那么这不应该被标记为C#而不是Java吗？为什么这篇文章被标记为“Java”？它看起来是关于C#的。我真的认为没有必要为这样一个简单的问题粘贴整个代码，但我想太多总比太少好。