十六进制翻转

public string ReverseA(string text)
{
   char[] cArray = text.ToCharArray();
   string reverse = String.Empty;
   int a = 0;
   for (int i = cArray.Length - 1; i > 0; i--)
   {
      a++;
      if (a % 2 == 1)
      {
         reverse += cArray[i - 1];
         reverse += cArray[i];
      }
   }
   return reverse;
}