ViewState优化——压缩技术

来源：互联网发布：点击图片弹出视频js 编辑：程序博客网时间：2024/05/17 01:17

private byte[] Compress(byte[] data)
        {
            MemoryStream ms = new MemoryStream();
            GZipStream stream = new GZipStream(ms, CompressionMode.Compress);
            stream.Write(data, 0, data.Length);
            stream.Close();
            return ms.ToArray();
        }

        private byte[] Decompress(byte[] data)
        {
            MemoryStream ms = new MemoryStream();
            ms.Write(data, 0, data.Length);
            ms.Position = 0;
            GZipStream stream = new GZipStream(ms, CompressionMode.Decompress);
            MemoryStream temp = new MemoryStream();
            byte[] buffer = new byte[1024];
            while (true)
            {
                int read = stream.Read(buffer, 0, buffer.Length);
                if (read <= 0)
                {
                    break;
                }
                else
                {
                    temp.Write(buffer, 0, buffer.Length);
                }
            }
            stream.Close();
            return temp.ToArray();
        }

        protected override void SavePageStateToPersistenceMedium(object state)
        {
            //base.SavePageStateToPersistenceMedium(state);

            LosFormatter formatter = new LosFormatter();
            StringWriter writer = new StringWriter();
            formatter.Serialize(writer, state);
            string viewState = writer.ToString();
            byte[] data = Convert.FromBase64String(viewState);
            byte[] compressedData = Compress(data);
            string str = Convert.ToBase64String(compressedData);
            ClientScript.RegisterHiddenField("__CIPVIEWSTATE", str);

}

        protected override object LoadPageStateFromPersistenceMedium()
        {
            //return base.LoadPageStateFromPersistenceMedium();

            string viewstate = Request.Form["__CIPVIEWSTATE"];
            byte[] data = Convert.FromBase64String(viewstate);
            byte[] uncompressedData =
            Decompress(data);
            string str = Convert.ToBase64String(uncompressedData);
            LosFormatter formatter = new LosFormatter();
            return formatter.Deserialize(str);

}