C# Cookie方法

 //写入
  protected void Button1_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(, , ,,);//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 Button2_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(-, , , );
        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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