Cookie怎麼寫就怎麼讀

  Cookie怎麼寫就怎麼讀

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class B : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            //產生一個Cookie

            HttpCookie cookie = new HttpCookie("test");

            //設定單值

            cookie.Value = Server.UrlEncode("Hello!!世界");

            //設定過期日

            cookie.Expires = DateTime.Now.AddDays(2);

            //寫到用戶端

            Response.Cookies.Add(cookie);

        }

    }

    //讀取cookie(以多值的方式)

    protected void btn_test_Click(object sender, EventArgs e)

    {

        HttpCookie cookie = Request.Cookies["test"];

        foreach (string value in cookie.Values)

        {

            Response.Write("Null?"+(value==null)+"<br/>");/*順便測試看看是否為null還是空字串*/

            Response.Write("空字串?"+(value=="")+"<br/>");

            Response.Write("foreach迴圈中撈出Request.Cookies['test']所有的Value：" + Server.UrlDecode(value)+"<hr/>");

        }

        Response.Write("Null?"+(cookie["test"]==null)+"<br/>");

        Response.Write("空字串?" + (cookie["test"]=="")+"<br/>");

        Response.Write("cookie['test'](HttpCookie物件裡索引名為test的值)："+Server.UrlDecode(cookie["test"])+"<hr/>");

    }

}