Cookie的使用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Cookie : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    //创建Cookie
    protected void Button1_Click(object sender, EventArgs e)
    {
        HttpCookie Cookie = new HttpCookie("MyCookie");
        DateTime dt=DateTime.Now;
        TimeSpan ts=new TimeSpan (0,0,1,0,0);//过期时间设置为1分钟

        //设置过期时间
        Cookie.Expires = dt.Add(ts);
        Cookie.Values.Add("name","yys");
        Cookie.Values.Add("age","24");

        Response.AppendCookie(Cookie);
        
    }
    //读取
    protected void Button2_Click(object sender, EventArgs e)
    {
        if(Request.Cookies["Mycookie"]!=null)
        {
            Response.Write(Request.Cookies["Mycookie"].Value);                    
        }
    }

    //修改
    protected void Button3_Click(object sender, EventArgs e)
    {
        //获取客户端的Cookie对象
        HttpCookie cok = Request.Cookies["MyCookie"];

        if(cok!=null)
        {
            cok.Values["name"] = "Abner";
            cok.Values.Set("age","20");

            //往Cookie里加入新的内容
            cok.Values.Set("sex","男");

            Response.AppendCookie(cok);

        
            Response.Write(Request.Cookies["MyCookie"].Value);
            
        }

    }
    //删除
    protected void Button4_Click(object sender, EventArgs e)
    {
        HttpCookie co=Request.Cookies["MyCookie"];

        co.Values.Remove("sex");//删除键为“sex”的键值对
        Response.Write(Request.Cookies["MyCookie"].Value);

        TimeSpan ts = new TimeSpan(-1,0,0,0);
        co.Expires = DateTime.Now.Add(ts);//删除整个Cookie，只要把过期时间设置为现在
        
    }
}