十六进制字符串到ASCII的转换以及ASCII到十六进制的转换问题

Question

I have write two methods to convert Hex string to ASCII and ASCII string to Hex string. But when I compare the two strings it I getting two difference Hex strings.

Eg: Hex string = 6220000008a01000

I convert this string to ASCII using below method

public static string ConvertHex(string hexString)
{
    try
    {
        string ascii = string.Empty;

        for (int i = 0; i < hexString.Length; i += 2)
        {
            string hs = string.Empty;

            hs = hexString.Substring(i, 2);
            ulong decval = Convert.ToUInt64(hs, 16);
            long deccc = Convert.ToInt64(hs, 16);
            char character = Convert.ToChar(deccc);
            ascii += character;

        }

        return ascii;
    }
    catch (Exception ex) { Console.WriteLine(ex.Message); }

    return string.Empty;
}

and I convert that ASCII value back to hex string using below method

public string ASCIItoHex(string Value)
{
    StringBuilder sb = new StringBuilder();

    byte[] inputByte = Encoding.UTF8.GetBytes(Value);

    foreach (byte b in inputByte)
    {
        sb.Append(string.Format("{0:x2}", b));
    }

    return sb.ToString();
}

But as the final hex string I get below string.

Hex string = 6220000008c2a01000

Can anyone help me to figure it out what happen in there?

Answer 1

You try to represent two characters of a hex string (like "FF") as a single char . That does not work.

Your "hexString" is already the string representation of your hex number.