c# 调用DataSetSurrogate 压缩dataset出错!

[guanyongxin]

不知道为什么会出错!完全是照着网上写的

    public static DataSet ZipGetDataSet_SQL(string MD5, string sqlstr)
        {
            HyWeb.WebService1SoapClient sq = new HyWeb.WebService1SoapClient();
            byte[] buffer = Decompress(sq.GetDataSetSurrogateZipBytes(sqlstr));
            BinaryFormatter ser = new BinaryFormatter();
            DataSetSurrogate dss = (DataSetSurrogate)ser.Deserialize(new MemoryStream(buffer));
            return dss.ConvertToDataSet();
        }

        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;
            }
        }