Hexadecimal To Byte Array C# [duplicate]

Question

I use a web service that returns an XSTRING from a SAP system encoded as hexadecimal in the Web service (characters 0 to 9 and A to F). I capture that XSTRING as a string in my code, but now I need to convert it to an array of bytes in order to later convert that array of bytes to a .pdf file.

How do you exactly make that initial conversion from hexadecimal to byte[]?

That doesn't mean a lot to say that a Web service returns a XSTRING. What do you actually receive? (either characters from base64 0-9a-zA-Z+/=, or hexadecimal characters 0-9A-F, or something else?) — Sandra Rossi
– Sandra Rossi, Commented Jun 30, 2021 at 14:27

FranciscoFJM · Accepted Answer · 2021-06-30 15:23:49Z

1

I found a solution that actually worked for me, so i'm sharing it here:

byte[] byteArray = Enumerable.Range(0, PDF_XSTRING.Length)
                 .Where(x => x % 2 == 0)
                 .Select(x => Convert.ToByte(PDF_XSTRING.Substring(x, 2), 16))
                 .ToArray();

answered Jun 30, 2021 at 15:23

FranciscoFJM

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2 Comments

Sandra Rossi Over a year ago

So it means that in your case the Web service returned hexadecimal characters 0-9A-F (note that SAP default way of encoding XSTRING is base64).

FranciscoFJM Over a year ago

Yes it does, but i cannot mark it as a correct answer until 3 days have passed.

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