[C#]Cookie中保存Object类型数据[转]

对于Web中Object类型数据的保存,一般都是用Session,ViewState.不过这样一来,用户退出或者关闭IE后,就无法保存了,没办法,只能用Cookie试试了

原理：利用序列化／反序列化，保存Object类型的时候，序列化为字符串保存，取用的时候，再反序列化为对象。

Cookie管理核心代码：

 

 

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
namespace CommonLibrary.CookieManager
{
    public class ObjectListCookie
    {
        public ObjectListCookie()
        {
            //
        }
        /// <summary>
        /// 将Object类型添加到Cookie项的子项中
        /// </summary>
        /// <param name="CookieName">保存Cookie项名字</param>
        /// <param name="CookieItem">要添加到子项的对象</param>
        /// <param name="MaxCount">最大项数，0代表不限</param>
        public void AddCookieItem(string CookieName, Object CookieItem, int MaxCount)
        {
           HttpCookie cookie;
            if (HttpContext.Current.Request.Cookies[CookieName] != null)
            {
                cookie = HttpContext.Current.Request.Cookies[CookieName];
            }
            else
            {
                cookie = new HttpCookie(CookieName);
            }

            //保证不超过最大项数

            if (cookie.Values.Count >= MaxCount)
            {
                int DelCount = cookie.Values.Count - MaxCount + 1;
                for (int i = 0; i < DelCount; i++)
                {
                    cookie.Values.Remove(cookie.Values.GetKey(0));
                }
            }
            string cookieValue = ObjectStrConvert.ObjectToBase64Str(CookieItem);
            cookie.Values.Add(System.DateTime.Now.ToString("yyyyMMddHHmmssfff"), cookieValue);
            cookie.Expires = DateTime.MaxValue;    
            if (HttpContext.Current.Request.Cookies[CookieName] != null)
            {
                HttpContext.Current.Response.Cookies.Set(cookie);
            }
           else
            {
                HttpContext.Current.Response.Cookies.Add(cookie);
           }
        }

        /// <summary>
        /// 得到指定Cookie项中保存的对象列表
        /// </summary>
        /// <param name="CookieName">Cookie项名字</param>
        /// <param name="ItemObjType">子项对象类型</param>
        /// <returns></returns>
        public List<Object> GetObjectListFromCookie(string CookieName, Type ItemObjType)
        {
            HttpCookie cookie;
            List<Object> list = new List<Object>();
            if (HttpContext.Current.Request.Cookies[CookieName] != null)
            {
                cookie = HttpContext.Current.Request.Cookies[CookieName];
                for (int i = 0; i < cookie.Values.Count; i++)
                {
                    Object obj = ObjectStrConvert.Base64StrToObject(cookie.Values[i], ItemObjType);
                    list.Add(obj);
                }
            }        

            return list;
        }

        /// <summary>
        /// 清除指定Cookie的所有子项
        /// </summary>
        /// <param name="CookieName">Cookie名字</param>

        public void ClearCookieItems(string CookieName)
        {
            if (HttpContext.Current.Request.Cookies[CookieName] != null)
            {
                HttpCookie cookie = HttpContext.Current.Request.Cookies[CookieName];
                cookie.Values.Clear();
                HttpContext.Current.Response.Cookies.Set(cookie);
            }
        }
    }
}