分享：ViewState压缩方法

在使用 Asp.net WebForm进行开发中我一般会在自定义页面基类(BasePage)中进行ViewState的压缩, 注：此方法为网上收集，功能挺实用的。

压缩代码：

　　 /// <summary>
    /// 压缩数据
    /// </summary>
    /// <param name="data"></param>
    /// <returns></returns>
    public 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();
    }

    /// <summary>
    /// 解压数据
    /// </summary>
    /// <param name="data"></param>
    /// <returns></returns>
    public 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();
    }

 在页面的基类中的代码：

/// <summary>
    /// 重载SavePageStateToPersistenceMedium
    /// <remarks>
    /// 将viewstate进行压缩
    /// </remarks>
    /// </summary>
    /// <param name="state"></param>
    protected override void SavePageStateToPersistenceMedium(object state)
    {
        LosFormatter formatter = new LosFormatter();
        StringWriter writer = new StringWriter();
        formatter.Serialize(writer, state);
        string viewState = writer.ToString();
        byte[] data = Convert.FromBase64String(viewState);
        byte[] compressedData = this.Compress(data);
        string str = Convert.ToBase64String(compressedData);
        ClientScript.RegisterHiddenField("__MYVIEWSTATE", str);
    }

    /// <summary>
    /// 重载LoadPageStateFromPersistenceMedium
    /// <para>将viewstate进行解压缩</para>
    /// </summary>
    /// <returns></returns>
    protected override object LoadPageStateFromPersistenceMedium()
    {
        string viewstate = Request.Form["__MYVIEWSTATE"];
        byte[] data = Convert.FromBase64String(viewstate);
        byte[] uncompressedData =
        this.Decompress(data);
        string str = Convert.ToBase64String(uncompressedData);
        LosFormatter formatter = new LosFormatter();
        return formatter.Deserialize(str);
    }

代码比较简单，所以不写注释。

压缩效率可将Viewstate减小50%左右。(非精确值，估计的大概值)；

上面代码我都写在BasePage基类中。