c#对dataset和list集合压缩和解压，能提高访问速度

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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 = temp.ToArray();          temp.Close();          temp.Dispose();          return bData;      }      /// <summary>      /// 压缩数据      /// </summary>      /// <param name="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 = ms.ToArray();          ms.Close();          ms.Dispose();          return bData;      }        public static DataSet ConvertByteArrayToDataSet(Byte[] aByte)      {          DataSet resultDs = null;          MemoryStream ms = new MemoryStream(aByte);          IFormatter bf = new BinaryFormatter();            try          {                object obj = bf.Deserialize(ms);              resultDs = (DataSet)obj;              ms.Close();              return resultDs;          }          catch (Exception ex)          {              throw ex;              }          finally          {              if (ms != null) ms.Close();              resultDs.Dispose();            }            }      /// <summary>      /// 将DataSet格式化成字节数组byte[]      /// </summary>      /// <param name="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 = ms.ToArray();              ms.Close();          }          catch (Exception ex)          {              throw new Exception(ex.Message);          }          finally          {              if (ms != null) ms.Close();          }            return tranData;      }            /// <summary>     /// 把list转换成dataset     /// </summary>     /// <typeparam name="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 = row[tempName];                            //值不能为空，                            if (value != null && value != DBNull.Value && row[tempName].ToString() != null &&                               !row[tempName].ToString().Trim().Equals(""))                          {                              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 = null;                          //}                          //if (tempName.Trim().Equals("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;      }    }

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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();          }

 这个自己写的，有什么问题可以给我留言