public  class YS    {        public static byte[] Decompress(byte[] data)        {            byte[] bData;            MemoryStream ms = new MemoryStream();            //把数据写入到内存流            ms.Write(data, 0, data.Length);           //确定写入的位置，因为不是一次性写入            ms.Position = 0;            //解压流            GZipStream stream = new GZipStream(ms, CompressionMode.Decompress, true);            //性能处理            byte[] buffer = new byte[4096];            //临时内存流            MemoryStream temp = new MemoryStream();            //读入指定的文件流,0表示有没有到文件末尾            int read = stream.Read(buffer, 0, buffer.Length);            while (read > 0)            {                //写入到临时缓冲区内                temp.Write(buffer, 0, read);                //                read = stream.Read(buffer, 0, buffer.Length);            }            //必须把stream流关闭才能返回ms流数据,不然数据会不完整            stream.Close();            stream.Dispose();            ms.Close();            ms.Dispose();            bData = http://www.mamicode.com/temp.ToArray();"data"></param>        /// <returns></returns>        public static byte[] Compress(byte[] data)        {            byte[] bData;            //创建内存流            MemoryStream ms = new MemoryStream();            //创建压缩解压对象            GZipStream stream = new GZipStream(ms, CompressionMode.Compress, true);            //把数据写入缓冲区            stream.Write(data, 0, data.Length);            stream.Close();            stream.Dispose();            //必须把stream流关闭才能返回ms流数据,不然数据会不完整            //并且解压缩方法stream.Read(buffer, 0, buffer.Length)时会返回0            bData = http://www.mamicode.com/ms.ToArray();"dsOriginal">DataSet对象</param>        /// <returns>字节数组</returns>        public static Byte[] ConvertDataSetToByteArray(DataSet aDs)        {            //保存序列化的对象            Byte[] tranData;            //创建内存流            MemoryStream ms = new MemoryStream();            //创建格式化对象            IFormatter bf = new BinaryFormatter();            try            {                if (aDs == null) return null;                //设置序列化的方式                aDs.RemotingFormat = SerializationFormat.Binary;                //序列化字节对象                bf.Serialize(ms, aDs);                //把流转换成字节数组                tranData = http://www.mamicode.com/ms.ToArray();"T"></typeparam>       /// <param name="list"></param>       /// <returns></returns>        public static DataSet ConvertToDataSet<T>(IList<T> list)        {            if (list == null || list.Count <= 0)            {                return null;            }            //创建dataset 对象            DataSet ds = new DataSet();            //创建表的，并且以类型的名字命名            DataTable dt = new DataTable(typeof(T).Name);            DataColumn column;            DataRow row;            //通过反射得到属性对象，只能得到简单的属性            System.Reflection.PropertyInfo[] myPropertyInfo                = typeof(T).GetProperties(System.Reflection.BindingFlags.Public                | System.Reflection.BindingFlags.Instance);            //遍历集合，遍历一次创建一行            foreach (T t in list)            {                if (t == null)                {                    continue;                }                row = dt.NewRow();                //根据属性创建列                for (int i = 0, j = myPropertyInfo.Length; i < j; i++)                {                    System.Reflection.PropertyInfo pi = myPropertyInfo[i];                    string name = pi.Name;                    if (name.Trim().ToLower().Equals("lastmodify"))                    {                        continue;                    }                    //判断列的值为不为空                    if (dt.Columns[name] == null)                    {                        //获得属性的类型，作为列的类型                        Type colType = pi.PropertyType;                        //感觉这个if语句没啥用，有知道的朋友给我留言，谢谢了                        if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition()                                == typeof(Nullable<>)))                        {                            colType = colType.GetGenericArguments()[0];                        }                        column = new DataColumn(name, colType);                        dt.Columns.Add(column);                    }                    //获得属性的值，判断是不是为空                    row[name] = pi.GetValue(t, null) == null ? DBNull.Value                         : pi.GetValue(t, null);                }                dt.Rows.Add(row);            }            ds.Tables.Add(dt);            return ds;        }        public static List<T> GetList<T>(DataSet ds )        {            DataTable table = ds.Tables[0];            List<T> list = new List<T>();            //            T t = default(T);            PropertyInfo[] propertypes = null;            string tempName = string.Empty;            try            {                foreach (DataRow row in table.Rows)                {                    //动态创建一个对象                    t = Activator.CreateInstance<T>();                    //获得该类的所有属性                    propertypes = t.GetType().GetProperties();                    //遍历属性                    foreach (PropertyInfo pro in propertypes)                    {                        //属性名                        tempName = pro.Name;                        //检查表中是否包含该列                        if (table.Columns.Contains(tempName))                        {                            object value = http://www.mamicode.com/row[tempName];""))                            {                                if (tempName.Trim().ToLower().Equals("lastmodify"))                                {                                    // pro.SetValue(t, ConvertHelper.ConvertToTimestamp(Convert.ToString(value)), null);                                }                                else                                {                                    //char类型单独处理                                    if (pro.PropertyType == typeof(System.Char)                                        || pro.PropertyType == typeof(System.Nullable<System.Char>))                                    {                                        pro.SetValue(t, Convert.ToChar(value), null);                                    }                                    else                                    {                                        pro.SetValue(t, value, null);                                    }                                }                            }                            //if (value.GetType() == typeof(System.DBNull))                            //{                            //    value = http://www.mamicode.com/null;"lastmodify"))                            //{                            // pro.SetValue(t,Convert.to                            //pro.SetValue(t, 0, null);                            //}                            //else                            //{                            //   pro.SetValue(t, value, null);                            //}                        }                    }                    list.Add(t);                }            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }            return list;        }    }

 static void Main(string[] args)        {          //  using (BookShop2Entities context = new BookShop2Entities()) {           List<User<string>> list = new List<User<string>>{             new User<string>(){Age=90}           };              //把list集合转化成dataset           DataSet ds = YS.ConvertToDataSet(list);                         //压缩dataset           byte[] byes      =YS.ConvertDataSetToByteArray(ds);           Console.WriteLine("压缩之前字节数"+byes.Length);           byte[] byesYS      =YS.Compress(byes);           Console.WriteLine("压缩之后字节数" + byesYS.Length);           byte[] byesJZ = YS.Decompress(byesYS);           Console.WriteLine("解压之后字节数" + byesJZ.Length);            //解压成dataset           DataSet ds2 = YS.ConvertByteArrayToDataSet(byesJZ);                        //            Console.WriteLine("完成");            Console.Read();        }