//==========================================================

        //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;

        }