页面持久化如何实现

Question

如题？

Answer 1

/// <summary> 
    /// 已重载。如果可能，从服务端内存中还原视图内容。 
    /// </summary> 
    /// <returns></returns> 
    protected override object LoadPageStateFromPersistenceMedium()
    {
        object state;        if (_state != null)
        {
            state = _state.First;
            //Session["SavePage"] = null;
        }
        else
            state = base.LoadPageStateFromPersistenceMedium();        return state;
    }    /// <summary> 
    /// 已重载。将当前视图内容和请求参数集合保存至服务器内存。 
    /// </summary> 
    /// <param name="state"></param> 
    protected override void SavePageStateToPersistenceMedium(object state)
    {
        base.SavePageStateToPersistenceMedium(state);
        if (_isNeedSavePage && (Request.QueryString["SavePage"] == null || Request.Url == Request.UrlReferrer))
        {
            Session["SavePage"] = new Pair(state, base.DeterminePostBackMode());
        }    }
/// <summary> 
    /// 已重载。当基类方法返回空值时，尝试从服务端内存中获取先前保存的请求参数集合。 
    /// </summary> 
    /// <returns></returns> 
    protected override System.Collections.Specialized.NameValueCollection DeterminePostBackMode()
    {
        System.Collections.Specialized.NameValueCollection coll = base.DeterminePostBackMode();        if (coll == null)
        {
            if (Request.QueryString["SavePage"] != null)
            {
                _isLoadPageState = true;
                _state = Session["SavePage"] as Pair;
                //_state = this.GetResultData as Pair;
                if (_state != null)
                    coll = _state.Second as System.Collections.Specialized.NameValueCollection;
            }
            //else
            //    Session["SavePage"] = null;
        }        return coll;
    }