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C# string to byte function

In converter.telerik.com I converted a function and got the code below

I am getting an error on this line

 yKey = new byte[sHex.Length / (double)2 - 1 + 1];

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  private byte[] ConvertHex(string sHex)
{
    byte[] yKey;

    try
    {
        yKey = new byte[sHex.Length / (double)2 - 1 + 1];
        int i = 0;
        int j = 0;

        while (j < yKey.Length)
        {
            yKey[j] = Convert.ToByte(sHex.Substring(i, 2), 16);
            i += 2;
            j += 1;
        }
    }
    catch (Exception e)
    {
        throw new Exception(e.Message, e);
    }

    return yKey;
}

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Jonathan D.

You have GetBytes method built in which does exactly what you're trying to achieve.

Larry Brister

ASKER

JOnathan,
Which I would use how with my string I am passing in? (sHex)

it_saige

Like this perhaps:

using System;

namespace EE_Q29215493
{
    class Program
    {
        static void Main(string[] args)
        {
            var bytes = "43480170".ConvertHex();
            Console.WriteLine($"Byte Array: [ {string.Join(", ", bytes)} ]");
            Console.ReadLine();
        }
    }

    static class Extensions
    {
        public static byte[] ConvertHex(this string hex)
        {
            uint num = uint.Parse(hex, System.Globalization.NumberStyles.AllowHexSpecifier);

            return BitConverter.GetBytes(num);
        }
    }
}

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Produces the following output:

HTH,

-saige-

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ste5an

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Jonathan D.

Which I would use how with my string I am passing in? (sHex)

byte[] bytes = Encoding.GetBytes(sHex);

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Note, you cannot convert a string to a byte, because a string is a sequence of characters. Therefor, you can convert it to a sequence of bytes, whereas each character is representing a single byte. If you need a specific encoding map, you can browse the inherited methods in the doc.