编程实现>ASP.NET 3.5会话控制>Cookie

转自于：http://www.cnblogs.com/fooo/archive/2008/01/07/1029119.html

//-----------------------------载入

if(!IsPostBack)
        {

            HttpCookie cookie = Request.Cookies["userinfo1"];
            cookie.Expires = System.DateTime.Now.AddMinutes(20);//设置过期时间
            for (int i = 0; i < 5; i++)
            {
                cookie.Values["BB" + i.ToString()] = i.ToString();
                Response.Cookies.Add(cookie);
            }
           
   }



//**************写入
       HttpCookie cookie = new HttpCookie("userinfo1");
        cookie.Expires = System.DateTime.Now.AddMinutes(20);//设置过期时间
        for (int i = 0; i < 10; i++)
        {
           
            cookie.Values["U" +i.ToString()] = i.ToString();          
            Response.Cookies.Add(cookie);
        }


//**************---------------读取
        //读取 Cookie 集合
        for (int i = 0; i < Request.Cookies.Count; i++)
        {
            if (Request.Cookies.AllKeys[i] == "userinfo1")
            {

                HttpCookie cookies = Request.Cookies["userInfo1"];
                Response.Write("name=" + cookies.Name + "<br/>");
                //Response.Write("name=" + cookies.Value + "<br/>");

                if (cookies.HasKeys)//是否有子键
                {
                    System.Collections.Specialized.NameValueCollection NameColl = cookies.Values;
                    for (int j = 0; j < NameColl.Count; j++)
                    {
                       
                        Response.Write("子键名=" + NameColl.AllKeys[j] + "<br/>");
                        Response.Write("子键值=" + NameColl[j] + "<br/>");
                    }

                }
                else
                {
                    Response.Write("value=" + cookies.Value + "<br/>");
                }
            }
         
        }


//***********************删除
HttpCookie acookie = Request.Cookies["userinfo1"];
        acookie.Expires = System.DateTime.Now.AddMinutes(20);//设置过期时间      
        if (acookie.HasKeys)//是否有子键
        {
            System.Collections.Specialized.NameValueCollection NameColl = acookie.Values; 
            for (int j = 0 ; j < NameColl.Count; j++)
            {               
                if (NameColl.AllKeys[j] == "U8")
                {
                    acookie.Values.Remove(NameColl.AllKeys[j]);
                    Response.Cookies.Add(acookie);
                }              
            }   
        }


//***************************追加
 HttpCookie cookie = Request.Cookies["userinfo1"];
        cookie.Expires = System.DateTime.Now.AddMinutes(20);//设置过期时间
        for (int i = 0; i < 5; i++)
        {
            cookie.Values["K" + i.ToString()] = i.ToString();
            Response.Cookies.Add(cookie);
        }

 

---------

protected void Button2_Click(object sender, EventArgs e)
     {
         HttpCookie cookie=new HttpCookie("MyCook");//初使化并设置Cookie的名称
         DateTime dt=DateTime.Now;
         TimeSpan ts = new TimeSpan(0, 0, 1,0,0);//过期时间为1分钟
         cookie.Expires = dt.Add(ts);//设置过期时间
         cookie.Values.Add("userid", "userid_value");
         cookie.Values.Add("userid2","userid2_value2");
         Response.AppendCookie(cookie);
        //输出该Cookie的所有内容
        //Response.Write(cookie.Value); //输出为：userid=userid_value&userid2=userid2_value2 
     }

    //读取
    protected void Button1_Click(object sender, EventArgs e)
     {

       // HttpCookie cokie = new HttpCookie("MyCook");//初使化
        if (Request.Cookies["MyCook"]!=null)
         {
            //Response.Write("Cookie中键值为userid的值:" + Request.Cookies["MyCook"]["userid"]);//整行
            //Response.Write("Cookie中键值为userid2的值" + Request.Cookies["MyCook"]["userid2"]);
             Response.Write(Request.Cookies["MyCook"].Value);//输出全部的值
         }
     }

    //修改Cookie
    protected void Button3_Click(object sender, EventArgs e)
     {
        //获取客户端的Cookie对象
         HttpCookie cok = Request.Cookies["MyCook"];
        
        if (cok != null)
         {
         //修改Cookie的两种方法
             cok.Values["userid"] = "alter-value";
             cok.Values.Set("userid", "alter-value");

          //往Cookie里加入新的内容
              cok.Values.Set("newid", "newValue");
              Response.AppendCookie(cok);
         }

      
     }
    //删除Cookie
    protected void Button4_Click(object sender, EventArgs e)
     {

         HttpCookie cok = Request.Cookies["MyCook"];
        if (cok != null)
         {
            if (!CheckBox1.Checked)
             {
                 cok.Values.Remove("userid");//移除键值为userid的值
             }
            else
             {
                 TimeSpan ts = new TimeSpan(-1, 0, 0, 0);
                 cok.Expires = DateTime.Now.Add(ts);//删除整个Cookie，只要把过期时间设置为现在
             }
             Response.AppendCookie(cok);
         }
     } 

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什么是Cookie