压缩和解压缩数据流

  //压缩压缩后的字节数组
        public byte[] Compress(byte[] data)
        {
            MemoryStream ms = new MemoryStream();
            Stream zipStream = new GZipStream(ms, CompressionMode.Compress, true);
            zipStream.Write(data, 0, data.Length);
            zipStream.Close();
            ms.Position = 0;
            byte[] buffer = new byte[ms.Length];
            ms.Read(buffer, 0,int.Parse(ms.Length.ToString()));
            return buffer;
        }

//解压缩
  public static byte[] Decompress(byte[] data)
        {
            try
            {
                MemoryStream ms = new MemoryStream(data);
                Stream zipStream = null;
                zipStream = new GZipStream(ms, CompressionMode.Decompress);
                byte[] dc_data = null;
                dc_data = EtractBytesFormStream(zipStream, data.Length);
                return dc_data;
            }
            catch
            {
                return null;
            }
        }


        public static byte[] EtractBytesFormStream(Stream zipStream, int dataBlock)
        {
            try
            {
                byte[] data = null;
                int totalBytesRead = 0;
                while (true)
                {
                    Array.Resize(ref data, totalBytesRead + dataBlock + 1);
                    int bytesRead = zipStream.Read(data, totalBytesRead, dataBlock);
                    if (bytesRead == 0)
                    {
                        break;
                    }
                    totalBytesRead += bytesRead;
                }
                Array.Resize(ref data, totalBytesRead);
                return data;
            }
            catch
            {
                return null;
            }
        }