c# - write string that contains hex values as bytes

let's say I have a string

string hex = "55 6E 6B 6E 6F 77 6E 20 53 70 61 63 65"


I want to write these to a file but they should be the bytes itself.
so the result would be Unknown Space.

Is there any way to do that directly instead of first encoding it to utf-8 and write that to the file? the reason I'm asking is that sometimes there is the special character of utf-8 in the (like e.g. 0xE28780) which wouldn't work well if I first split the string into chars of each value.

encoding

utf-8

utf-8

0xE28780

Thanks a lot!

1 Answer
1

with string.Split, Convert.ToByte, and FileStream or File.WriteAllBytes

string.Split

Convert.ToByte

FileStream

File.WriteAllBytes

string hex = "55 6E 6B 6E 6F 77 6E 20 53 70 61 63 65";
var bytes = hex.Split(' ')
.Select(x => Convert.ToByte(x, 16))
.ToArray();

using (var fs = new FileStream(@"D:test2.dat",FileMode.Create))
fs.Write(bytes,0,bytes.Length);

// or even easier

File.WriteAllBytes(@"D:test2.dat",bytes);


String.Split Method

Returns a string array that contains the substrings in this instance
that are delimited by elements of a specified string or Unicode
character array.

Convert.ToByte Method (String, Int32)

Converts the string representation of a number in a specified base to
an equivalent 8-bit unsigned integer.

FileStream Class

Provides a Stream for a file, supporting both synchronous and
asynchronous read and write operations.

File.WriteAllBytes Method (String, Byte)

Creates a new file, writes the specified byte array to the file, and
then closes the file. If the target file already exists, it is
overwritten.

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