byte[] to hex string [duplicate]

Answer 1

Here is another method:

public static string ByteArrayToHexString(byte[] Bytes)
{
    StringBuilder Result = new StringBuilder(Bytes.Length * 2);
    string HexAlphabet = "0123456789ABCDEF";

    foreach (byte B in Bytes)
    {
        Result.Append(HexAlphabet[(int)(B >> 4)]);
        Result.Append(HexAlphabet[(int)(B & 0xF)]);
    }

    return Result.ToString();
}

public static byte[] HexStringToByteArray(string Hex)
{
    byte[] Bytes = new byte[Hex.Length / 2];
    int[] HexValue = new int[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 
       0x06, 0x07, 0x08, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
       0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F };

    for (int x = 0, i = 0; i < Hex.Length; i += 2, x += 1)
    {
        Bytes[x] = (byte)(HexValue[Char.ToUpper(Hex[i + 0]) - '0'] << 4 |
                          HexValue[Char.ToUpper(Hex[i + 1]) - '0']);
    }

    return Bytes;
}

Alternatively, you could pre-build the translation table like so to achieve even faster results:

http://blogs.msdn.com/b/blambert/archive/2009/02/22/blambert-codesnip-fast-byte-array-to-hex-string-conversion.aspx