Convert.ToByte Could not find any recognizable digits

Question

I need somehow convert "xxx" to byte but i got exception

An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll

Additional information: Could not find any recognizable digits.

Is it possible "xxx" value convert to byte?

 byte tr  = (byte)(Convert.ToByte("xxx", 16) << 4);

byte[] tr = Encoding.UTF8.GetBytes("xxx") this work fine but i wondering how can i apply this shiftting 16) << 4); — , Apr 25 '16 at 05:19
Apply the shifting afterwards. You can't apply it in the convert. — Christian Klemm, Apr 25 '16 at 05:21
what you are doing is converting xxx in 16 base to byte. we don't have xxx in 16 base. — Mehrdad, Apr 25 '16 at 05:23
oh okey than Encoding.UTF8.GetBytes("xxx") how much base of byte here is? — , Apr 25 '16 at 05:25

score 1 · Answer 1 · edited May 23 '17 at 12:16

1

This line (Convert.ToByte("xxx", 16) << 4) will return integer which is not convertible into string when parsing to byte that's why it throws the System.FormatException.

But there is already a good example of how to convert the string into byte[].

static byte[] GetBytes(string str)
{
    byte[] bytes = new byte[str.Length * sizeof(char)];
    System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
    return bytes;
}

Source of Example

edited May 23 '17 at 12:16

Community

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answered Apr 25 '16 at 05:25

Leonel Sarmiento

1,556
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than i got 120,0,120,0,120,0 but i with Encoding.UTF8.GetBytes("xxx") i can get 120,120,120 so maybe is better Encoding.UTF8.GetBytes("xxx")? – Apr 25 '16 at 05:32
@IrmantasMedeišis It's up to you, the only benefit of my approach is you can still get the data and reconstruct the original string even if it contains an [invalid data](http://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-test.txt) because it's only looking at the bytes. – Leonel Sarmiento Apr 25 '16 at 06:00

score 0 · Answer 2 · answered Apr 25 '16 at 05:16

0

It is not possible to convert "xxx" to a byte. It simply is not the representation of any byte.

answered Apr 25 '16 at 05:16

Ferdinand Swaters

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byte[] tr = Encoding.UTF8.GetBytes("xxx"); but with this i got that x is 120 – Apr 25 '16 at 05:21
Which is a valid value – Christian Klemm Apr 25 '16 at 05:22

score 0 · Answer 3 · answered Apr 25 '16 at 05:41

0

If you need to change a string into a byte array :

 byte[] toBytes = Encoding.ASCII.GetBytes("xxx");

answered Apr 25 '16 at 05:41

Vatsal Pathak

60
10

Convert.ToByte Could not find any recognizable digits

3 Answers3