c# 十六进制与十进制 转换

          //十六进制byte数组转为 int 十进制
            byte[] d1 = new byte[4] {0x34,0xFB,0x5E,0x38 };
            if (BitConverter.IsLittleEndian)
                Array.Reverse(d1); //need the bytes in the reverse order
            int value = BitConverter.ToInt32(d1, 0);
            ///十六进制数字字符串转为int 十进制
            int va = Convert.ToInt32("34FB5E38", 16);

        public static byte[] StringToBytes(string TheString)
        {
            Encoding FromEcoding = Encoding.GetEncoding("UTF-8");
            Encoding ToEcoding = Encoding.GetEncoding("GB2312");
            byte[] FromBytes = FromEcoding.GetBytes(TheString);
            byte[] ToBytes = Encoding.Convert(FromEcoding, ToEcoding, FromBytes);
            return ToBytes;
        }

        public static string BytesToString(byte[] Bytes)
        {
            string Mystring;
            Encoding FromEcoding = Encoding.GetEncoding("GB2312");
            Encoding ToEcoding = Encoding.GetEncoding("UTF-8");

            byte[] ToBytes = Encoding.Convert(FromEcoding, ToEcoding, Bytes);
            Mystring = ToEcoding.GetString(ToBytes);
            return Mystring;
        }