C# 16进制转字符串,字符串转16进制

{

 //==========================================================
        //16进制转字符串
        public static byte[] HexToString(byte[] Str)
        {
            string String = Encoding.Default.GetString(Str);
            byte[] str = new byte[Str.Length / ];
            for (int i = ; i < str.Length; i++)
            {
                int temp = Convert.ToInt32(String.Substring(i * , ), );
                str[i] = (byte)temp;
            }
            return str;
        }
        public static byte[] HexToString(string Str)
        {
            byte[] str = new byte[Str.Length / ];
            for (int i = ; i < str.Length; i++)
            {
                int temp = Convert.ToInt32(Str.Substring(i * , ), );
                str[i] = (byte)temp;
            }
            return str;
        }
        //字符串转16进制
        public static byte[] StringToHex(byte[] Str)
        {
            string String = "";
            for (int i = ; i < Str.Length; i++)
            {
                String += Encoding.Default.GetString(IntToHex(Str[i]));
            }
            return Encoding.Default.GetBytes(String);
        }
        public static byte[] StringToHex(string Str)
        {
            byte[] str = Encoding.GetEncoding("gb2312").GetBytes(Str);
            return StringToHex(str);
        }
        private static byte[] IntToHex(byte num)
        {
            if (num > )
            {
                Console.WriteLine("大于两个字节数");
            }
            byte[] arr = new byte[];
            int i = ;
            while (true)
            {
                if (num %  < )
                {
                    arr[i] = (byte)((num % ) + );
                }
                else
                {
                    switch (num % )
                    {
                        case : arr[i] = (byte)'A'; break;
                        case : arr[i] = (byte)'B'; break;
                        case : arr[i] = (byte)'C'; break;
                        case : arr[i] = (byte)'D'; break;
                        case : arr[i] = (byte)'E'; break;
                        case : arr[i] = (byte)'F'; break;
                    }
                }
                num /= ;
                if (num == )
                {
                    break;
                }
                i++;
            }
            if (arr[] == )
            {
                arr[] = ;
            }
            if (arr[] == )
            {
                arr[] = ;
            }
            byte temp = arr[];
            arr[] = arr[];
            arr[] = temp;
            return arr;
        }

}