How can I convert a hex string to a byte array? [duplicate]

Answer 1

I think this may work.

public static byte[] StrToByteArray(string str)
    {
        Dictionary hexindex = new Dictionary();
        for (int i = 0; i <= 255; i++)
            hexindex.Add(i.ToString("X2"), (byte)i);

        List hexres = new List();
        for (int i = 0; i < str.Length; i += 2)            
            hexres.Add(hexindex[str.Substring(i, 2)]);

        return hexres.ToArray();
    }