页面viewstate视图处理方法_invalid viewstate怎么解决-优快云博客

本文链接：https://blog.youkuaiyun.com/wzwzwzwzw/article/details/7762475

本文详细介绍了ASP.NET页面状态持久化的实现机制，包括如何从缓存中加载页面状态和如何将页面状态保存到缓存中。通过使用自定义的状态格式化器，实现了状态的序列化与反序列化过程，确保了页面状态的一致性和可靠性。

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//页面需要继承该类文件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Web.UI;
using System.Threading;
namespace WebApplication2
{
    public class UrlPage : System.Web.UI.Page
    {
//取
        protected override object LoadPageStateFromPersistenceMedium()
        {
            string viewStateID = (string)((Pair)base.LoadPageStateFromPersistenceMedium()).Second;

            // var viewStateID = (string)((Pair)base.LoadPageStateFromPersistenceMedium()).Second;
            string stateStr = (string)Cache[viewStateID];
            if (stateStr == null)
            {
                string fn = Path.Combine(this.Request.PhysicalApplicationPath, @"App_Data/ViewState/" + viewStateID);
                stateStr = File.ReadAllText(fn);
            }
            return new ObjectStateFormatter().Deserialize(stateStr);
        }
//存
        protected override void SavePageStateToPersistenceMedium(object state)
        {
            string value = new ObjectStateFormatter().Serialize(state);
            string viewStateID = (DateTime.Now.Ticks + (long)this.GetHashCode()).ToString(); //产生离散的id号码
            string fn = this.Server.MapPath(@"~/App_Data/ViewState/" + viewStateID);

            //var fn = Path.Combine(this.Request.PhysicalApplicationPath, @”App_Data/ViewState/” + viewStateID);
            //ThreadPool.QueueUserWorkItem(obj => File.WriteAllText(fn, value));
            File.WriteAllText(fn, value);
            Cache.Insert(viewStateID, value);
            base.SavePageStateToPersistenceMedium(viewStateID);
        }
    }
}