Asp.Net 性能 ViewState 压缩的2种方法

Asp.Net 性能 ViewState 压缩的2种方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.IO.Compression;
using System.Web.UI;

/// <summary>
/// Summary description for PageBase
/// </summary>
public class PageBase : System.Web.UI.Page
{
    // 压缩
    public static byte[] Compress(byte[] data)
    {
        MemoryStream output = new MemoryStream();
        GZipStream gzip = new GZipStream(output,
                          CompressionMode.Compress, true);
        gzip.Write(data, 0, data.Length);
        gzip.Close();
        return output.ToArray();
    }

    // 解压缩
    public static byte[] Decompress(byte[] data)
    {
        MemoryStream input = new MemoryStream();
        input.Write(data, 0, data.Length);
        input.Position = 0;
        GZipStream gzip = new GZipStream(input,
                          CompressionMode.Decompress, true);
        MemoryStream output = new MemoryStream();
        byte[] buff = new byte[64];
        int read = -1;
        read = gzip.Read(buff, 0, buff.Length);
        while (read > 0)
        {
            output.Write(buff, 0, read);
            read = gzip.Read(buff, 0, buff.Length);
        }
        gzip.Close();
        return output.ToArray();
    }

    protected override void SavePageStateToPersistenceMedium(object pageViewState)
    {
        MemoryStream ms = new MemoryStream();
        LosFormatter m_formatter = new LosFormatter();
        m_formatter.Serialize(ms, pageViewState);
        ms.Position = 0;
        StreamReader sr = new StreamReader(ms);
        string viewStateString = sr.ReadToEnd();
        byte[] ViewStateBytes = Convert.FromBase64String(viewStateString);
        ViewStateBytes = Compress(ViewStateBytes);
        Session["ViewState"] = Convert.ToBase64String(ViewStateBytes);
        ms.Close();
        return;
    }

    // 序列化ViewState
    protected override object LoadPageStateFromPersistenceMedium()
    {
        object viewStateBag;
        string m_viewState = (string)Session["ViewState"];
        byte[] ViewStateBytes = Convert.FromBase64String(m_viewState);
        ViewStateBytes = Decompress(ViewStateBytes);
        LosFormatter m_formatter = new LosFormatter();
        try
        {
            viewStateBag = m_formatter.Deserialize(Convert.ToBase64String(ViewStateBytes));
        }
        catch (Exception ex)
        {
            viewStateBag = string.Empty;
        }
        return viewStateBag;
    }
}