How do you convert Byte Array to Hexadecimal String, and vice-versa?

Hi Everyone!

This is probably a common question over the Internet, but I couldn't find an answer that neatly explains how you can convert a byte array to a hexadecimal string, and vice-versa.

Last updated:5/29/2013 9:04:29 AM

Hi John!

Either:

`public static string ByteArrayToString(byte[] ba){  StringBuilder hex = new StringBuilder(ba.Length * 2);  foreach (byte b in ba)    hex.AppendFormat("{0:x2}", b);  return hex.ToString();}`
or:

`public static string ByteArrayToString(byte[] ba){  string hex = BitConverter.ToString(ba);  return hex.Replace("-","");}`
There are even more variants of doing it, for example here.

The reverse conversion would go like this:

`public static byte[] StringToByteArray(String hex){  int NumberChars = hex.Length;  byte[] bytes = new byte[NumberChars / 2];  for (int i = 0; i < NumberChars; i += 2)    bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);  return bytes;}`
Edit: you can improve performance for long strings by using a single pass parser, like so:

`public static byte[] StringToByteArray(String hex){  int NumberChars = hex.Length/2;  byte[] bytes = new byte[NumberChars];  StringReader sr = new StringReader(hex);  for (int i = 0; i < NumberChars; i++)    bytes[i] = Convert.ToByte(new string(new char[2]{(char)sr.Read(), (char)sr.Read()}), 16);  sr.Dispose();  return bytes;}`