Turn string with numbers to byte array - C#

Question

I created string that contains numbers by calling string.Join on a byte array:

string str = string.Join(", ", arr);

(arr is a byte array).

How can I turn the string back to a byte array?

Answer 1

You can use String.Split and then Byte.Parse to parse the string, eg :

var newArray = str.Split(',').Select(Byte.Parse).ToArray();

Byte.Parse ignores whitespace so there's no need to trim

If you create the array like this :

var str = String.Join(", ", new byte[]{0xFF,0x05,0x56});

The new array produced by splitting:

var newArray = Split(',').Select(Byte.Parse).ToArray();

Will contain the values 255, 5 and 86.

Answer 2

Assuming your string looks like "1,2,3,4"

var numArray = str.Split(',').Select(s => Byte.Parse(s)).ToArray();

Runnable:

https://rextester.com/XOMQ99840

Not sure what the down vote is for. Shrug.