Adding 0x to each to letters or numbers

Question

I want to add 0x to each two letters or numbers; for example:

50573953463435464438414B58413135

I want it to be like:

0x50, 0x57, 0x39, 0x53, 0x46, 0x34 ,0x35, 0x46, 0x44, 0x38, 0x41, 0x4b, 0x58, 0x41, 0x31, 0x35

and after that, I want to add it to byte like this:

byte[] key = new byte[] { 0x50, 0x57, 0x39, 0x53, 0x46, 0x34 ,0x35, 0x46, 0x44, 0x38, 0x41, 0x4b, 0x58, 0x41, 0x31, 0x35 };

I'm confused as what you are asking. Do you want to be able to take a string like `895798238970B` and make a byte array out of it? Or do you want to produce a string that contains C# code? — Icemanind, Sep 23 '14 at 17:23
This is definitely something better suited for doing in a text editor than with c# code (for example, I would use vim's macro feature). — David Sherret, Sep 23 '14 at 18:01

score 1 · Accepted Answer · edited Jul 02 '20 at 20:07

1

Is this what you're asking for?

var str = "byte[] key = new byte[] { " + 
   Regex.Replace("50573953463435464438414B58413135", @"[0-9A-F]{2}", "0x$0, ") +
   "};";

str's value is

byte[] key = new byte[] { 0x50, 0x57, 0x39, 0x53, 0x46, 0x34, 0x35, 0x46, 0x44, 0x38, 0x41, 0x4B, 0x58, 0x41, 0x31, 0x35, };

edited Jul 02 '20 at 20:07

SSpoke

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answered Sep 23 '14 at 17:36

Tim S.

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i use you code like that : var str = Regex.Replace(result, @"[0-9A-F]{2}", "0x$0, "); and i do like that byte[] key = new byte[] { str }; i got error @tim-s – abdulaziz mohammed Sep 23 '14 at 18:01

score 1 · Answer 2 · edited May 23 '17 at 10:33

If you are trying to create a formatted string from a string of hex numbers:

string hexString = "50573953463435464438414B58413135";
string formattedHexString = string.Join("", Enumerable.Range(0, hexString.Length)
            .Where(z => z%2 == 0)
            .Select(z => "0x" + hexString.Substring(z, 2) + ", ")
            .ToArray()).Trim().TrimEnd(',');
Console.WriteLine(formattedHexString);

// Output:
// 0x50, 0x57, 0x39, 0x53, 0x46, 0x34, 0x35, 0x46, 0x44, 0x38, 0x41, 0x4B, 0x58, 0x41, 0x31, 0x35

If you are trying to create a byte array from a hex string. look at this SO question.

reckface · Answer 3 · 2014-09-23T18:01:07.307

var txt = "50573953463435464438414B58413135";
var split = 2;
var q=  Enumerable.Range(0, txt.Length / split)
        .Select(i => string.Format("0x{0}", txt.Substring(i * split, split)));
        q.Dump();

In LinqPad, combining a similar answer

EDIT

to get the byte array modify the above to include:

var txt = "50573953463435464438414B58413135";
var split = 2;
var q=  Enumerable.Range(0, txt.Length / split)
        .Select(i => string.Format("0x{0}", txt.Substring(i * split, split)))
        .Select (x => Convert.ToByte(x, 16)); // Add
        q.Dump();

score 0 · Answer 4 · answered Sep 23 '14 at 17:45

Complete test program, though I already saw some powerful (almost) oneliners:

using System;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Text.RegularExpressions;
using System.Collections.Generic;

namespace Hexify
{
    [TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void TestMethod1()
        {
            string pattern = "[0-9A-F][0-9A-F]";
            string input = "50573953463435464438414B58413135";

            var matchCollection = Regex.Matches(input, pattern);

            List<string> strings = new List<string>();

            foreach (Match m in matchCollection)
            {
                strings.Add(m.Value);
            }

            string result = String.Empty;

            if (strings.Count > 0)
            {
                result = "0x" + String.Join(", 0x", strings);
            }

            Assert.AreEqual("0x50, 0x57, 0x39, 0x53, 0x46, 0x34, 0x35, 0x46, 0x44, 0x38, 0x41, 0x4B, 0x58, 0x41, 0x31, 0x35", result);
        }
    }
}

score 0 · Answer 5 · answered Sep 23 '14 at 17:48

You're looking to convert the string from it's hexadecimal pairs to the byte equivalents, correct?

 List<byte> byteValues = new List<byte>();
 string split = "50573953463435464438414B58413135";

 for (int idx = 0; idx < split.Length - 1; idx += 2)
 {
     var value = split.Substring(idx, 2);

     byteValues.Add(Convert.ToByte(value, 16));
  }

  foreach (var b in byteValues)
       Console.WriteLine(b);

Adding 0x to each to letters or numbers

5 Answers5