/// <summary>重写保存页的所有视图状态信息</summary>
/// <param name="state">要在其中存储视图状态信息的对象</param>
protected override void SavePageStateToPersistenceMedium(Object state)
{
if (!CompressViewState)
{
base.SavePageStateToPersistenceMedium(state);
return;
}
MemoryStream ms = new MemoryStream();
new LosFormatter().Serialize(ms, state);
String vs = null;
//判断序列化对象的字符串长度是否超出定义的长度界限
if (ms.Length > LimitLength)
{
MemoryStream ms2 = new MemoryStream();
// 必须移到第一位，否则后面读不到数据
ms.Position = 0;
IOHelper.Compress(ms, ms2);
vs = "1$" + Convert.ToBase64String(ms2.ToArray());
}
else
{
vs = Convert.ToBase64String(ms.ToArray());
}
//注册在页面储存ViewState状态的隐藏文本框，并将内容写入这个文本框
ClientScript.RegisterHiddenField("__VSTATE", vs);
}