Converting string to equivalent byte hex in c#

Question

I have an incoming string 68016101061B4A60193390662046804020422044204000420040402060226024676DB16 and I want to convert into 0x68 0x01 0x61 0x01 0x06 0x1B 0x4

Answer 1

You can use a regular expression to do this:

var regex = new Regex(@"(\d{2})");

string aString = "040204220442040004200404020602260246";
string replaced = regex.Replace(aString, "x$1 ");

Fiddle

EDIT It seems like you need bytes instead of a string, you can use one of the Linq based answers suggested here or a simple loop:

if ((aString.Length % 2) != 0)
{
    // Handle invalid input
}

var bytes = new byte[aString.Length / 2];

int index = 0;
for (int i = 0; i < aString.Length; i += 2)
{
    string digits = aString.Substring(i, 2);
    byte aByte = (byte)int.Parse(digits, NumberStyles.HexNumber);

    bytes[index++] = aByte;
}

port.Write(bytes, 0, bytes.Length);

Note that if GC pressure became an issue, you could use ReadOnlySpan.

Fiddle