I'm making a card game and want to use the Unicode playing cards which range from U 1F0A0 to U 1F0DE.

Is there a way to create a partial Unicode sequence such as "\U0001F0" and then concatenate the last two digits on the end, or some way to change the last two digits of a full sequence to the ones needed?

I have tried StringBuilder, ToCharArray, .Insert, .Remove, .Add, .Replace etc, to replace the last two digits.

I have tried,

string cardCode = "\U0001F0" suit value;

string cardCode = "@\U0001F0" suit value;

string cardCode = $"\U0001F0{suit}{value}";

but of course the last two only display the string as plaintext, and the first one is an invalid escape sequence.

CodePudding user response：

Write a case based on your needs.

UI page:

Achieve effect:

Code logic: Variables are converted to Unicode strings, and then the last 2 digits are replaced.

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

    private void button1_Click(object sender, EventArgs e)
    {
       
        string s = textBox1.Text;
        char[] charbuffers = s.ToCharArray();
        byte[] buffer;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < charbuffers.Length; i  )
        {
            buffer = System.Text.Encoding.Unicode.GetBytes(charbuffers[i].ToString());
            sb.Append(String.Format("\\u{0:X2}{1:X2}", buffer[1], buffer[0]));
        }

        textBox2.Text = sb.ToString();
   
    }

    private void button2_Click(object sender, EventArgs e)
    {
        string s = textBox1.Text;
        char[] charbuffers = s.ToCharArray();
        byte[] buffer;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < charbuffers.Length; i  )
        {
            buffer = System.Text.Encoding.Unicode.GetBytes(charbuffers[i].ToString());
            sb.Append(String.Format("\\u{0:X2}{1:X2}", buffer[1], buffer[0]));
        }
        s = sb.ToString().Substring(0, sb.ToString().Length - 2);

        textBox3.Text = s;
    }

    private void button3_Click(object sender, EventArgs e)
    {
        string s = textBox1.Text;
        char[] charbuffers = s.ToCharArray();
        byte[] buffer;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < charbuffers.Length; i  )
        {
            buffer = System.Text.Encoding.Unicode.GetBytes(charbuffers[i].ToString());
            sb.Append(String.Format("\\u{0:X2}{1:X2}", buffer[1], buffer[0]));
        }
        s = sb.ToString().Substring(0, sb.ToString().Length - 2);
        s = s.Insert(4, "12");
        textBox4.Text = s;
    }
}

hope it helps you.

CodePudding user response：

There is a Unicode codepoint for each playing cards. The same value for different suits are multiples of 16 apart. And the values are nicely ordered from 1 for the ace to 14 for the king. So the effective codepoint can easily be calculated.

As proposed in the comments, Char.ConvertFromUtf32() will convert the integer codepoint into a string:

using System;
                    
public class Card
{
    public const int Spade = 0;
    public const int Hearts = 1;
    public const int Diamonds = 2;
    public const int Clubs = 3;
    
    public const int Ace = 1;
    public const int Two = 2;
    public const int Three = 3;
    public const int Four = 4;
    public const int Five = 5;
    public const int Six = 6;
    public const int Seven = 7;
    public const int Eight = 8;
    public const int Nine = 9;
    public const int Ten = 10;
    public const int Jack = 11;
    public const int Knight = 12;
    public const int Queen = 13;
    public const int King = 14;
    
    public static string CardString(int suit, int val) {
        return Char.ConvertFromUtf32(0x1F0A0   suit * 16   val);
    }
    
    public static void Main()
    {
        Console.WriteLine(CardString(Spade, Eight));
        Console.WriteLine(CardString(Diamonds, Ace));
        Console.WriteLine(CardString(Hearts, Queen));
        Console.WriteLine(CardString(Clubs, King));
    }
}

The result is: