谈Response.AppendCookie的使用方法 (1)

     我们用一个实例来学习谈一下Response.AppendCookie的使用方法，看下面的代码：

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);
        }