Question

I am practicing StringToByteArray() on VS2005. But throw exception. Could you please tell me more information about it?

Exception alert **An unhandled exception of type ‘System.FormatException’ occurred in mscorlib.dll

Additional information: Could not find any recognizable digits.**

public static byte[] StringToByteArray(String hex)
    {
        int NumberChars = hex.Length;
        byte[] bytes = new byte[NumberChars / 2];
        for (int i = 0; i < NumberChars; i += 2)
            // exception here
            bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
        return bytes;
    }

    static void Main()
    {
            byte[] myByte = new byte[2];
        myByte = StringToByteArray("0x0");
    }

Answer 1

You either need to drop the “0x” from the start of the string you pass in, or start your for loop with int i = 2;. Also you’re allocating the array in your method. You don’t need to do it Main as well.