Convert String[] to byte[] array

Question

I'm trying to convert this string array to byte array.

string[] _str= { "01", "02", "03", "FF"}; to byte[] _Byte = { 0x1, 0x2, 0x3, 0xFF};

I have tried the following code, but it does not work. _Byte = Array.ConvertAll(_str, Byte.Parse);

And also, it would be much better if I could convert the following code directly to the byte array : string s = "00 02 03 FF" to byte[] _Byte = { 0x1, 0x2, 0x3, 0xFF};

I assume all the strings describe hexadecimal numbers? – Dave Bish May 10 '12 at 09:30 — Dave Bish, May 10 '12 at 09:30
yeah, it missing on the str part :) – Ahmad Hafiz May 10 '12 at 09:40 — Ahmad Hafiz, May 10 '12 at 09:40

Botz3000 · Accepted Answer · 2012-05-10T09:57:38.693

14

This should work:

byte[] bytes = _str.Select(s => Convert.ToByte(s, 16)).ToArray();

using Convert.ToByte, you can specify the base from which to convert, which, in your case, is 16.

If you have a string separating the values with spaces, you can use String.Split to split it:

string str = "00 02 03 FF"; 
byte[] bytes = str.Split(' ').Select(s => Convert.ToByte(s, 16)).ToArray();

edited May 10 '12 at 09:57

answered May 10 '12 at 09:34

Botz3000

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@AhmadHafiz cool :) Also added a solution for converting a string. You can mark my response as answer if it helped you :) – Botz3000 May 10 '12 at 09:42
I know this thread is old but I got a problem here. If i convert my string[] to byte[] I get for example [0] "70" string [1] "34" string [2] "0A" string to [0] 112 byte [1] 52 byte [2] 10 byte But I need the same characters as byte. – Noli Jun 13 '12 at 13:22
@Noli they **are** the same. "0A" is 10 in hexadecimal notation. It's just displayed in decimal format. The value is correct. – Botz3000 Jun 13 '12 at 13:31
Ohhhh that is so.... I spent hours... But thank you sooo much for this!! Thank you! – Noli Jun 13 '12 at 16:34
Your code struck with unable to parse... this solution worked fine. https://stackoverflow.com/a/11268578/4425004 – Pranesh Janarthanan Nov 26 '19 at 08:01

score 4 · Answer 2 · answered May 10 '12 at 09:32

4

Try using LINQ:

byte[] _Byte = _str.Select(s => Byte.Parse(s)).ToArray()

answered May 10 '12 at 09:32

Marek Dzikiewicz

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Won't help. His problem is that `Byte.Parse` will not accept a string in hexadecimal format. – Jeppe Stig Nielsen May 10 '12 at 09:37

score 2 · Answer 3 · edited May 23 '17 at 12:14

2

With LINQ is the simplest way:

byte[] _Byte = _str.Select(s => Byte.Parse(s, 
                                           NumberStyles.HexNumber,
                                           CultureInfo.InvariantCulture)
                          ).ToArray();

If you have a single string string s = "0002FF"; you can use this answer

edited May 23 '17 at 12:14

Community

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answered May 10 '12 at 09:35

SynerCoder

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score 1 · Answer 4 · answered May 10 '12 at 09:47

1

You can still use Array.ConvertAll if you prefer, but you must specify base 16. So either

_Byte = Array.ConvertAll(_str, s => Byte.Parse(s, NumberStyles.HexNumber));

or

_Byte = Array.ConvertAll(_str, s => Convert.ToByte(s, 16));

answered May 10 '12 at 09:47

Jeppe Stig Nielsen

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Didn't know of that solution. Nice :) – Botz3000 May 10 '12 at 09:49
Of course you can use `string[] _str = stringWithSpaces.Split(' ');` to create `_str` in the first place, as others have pointed out. – Jeppe Stig Nielsen May 10 '12 at 09:54

score 1 · Answer 5 · answered May 10 '12 at 09:47

1

If you want to use ConvertAll you could try this:

byte[] _Byte = Array.ConvertAll<string, byte>(
    _str, s => Byte.Parse(s, NumberStyles.AllowHexSpecifier));

answered May 10 '12 at 09:47

Nadir Sampaoli

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score 0 · Answer 6 · answered May 10 '12 at 09:36

0

Try this one:

var bytes = str.Select(s => Byte.Parse(s, NumberStyles.HexNumber)).ToArray();

answered May 10 '12 at 09:36

ie.

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Convert String[] to byte[] array

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