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  • Cookie 学习笔记

    Cookie 是一小段文本信息,伴随着用户请求和页面在 Web 服务器和浏览器之间传递。Cookie 包含每次用户访问站点时 Web 应用程序都可以读取的信息。

    大多数浏览器支持最大为 4096 字节的 Cookie。

    编写Cookie

    方法一

    Response.Cookies["userName"].Value = "patrick";
    Response.Cookies["userName"].Expires = DateTime.Now.AddDays(1);

    方法二

    HttpCookie aCookie = new HttpCookie("lastVisit");
    aCookie.Value = DateTime.Now.ToString();
    aCookie.Expires = DateTime.Now.AddDays(1);
    Response.Cookies.Add(aCookie);

    读取Cookie

    if(Request.Cookies["userName"] != null)
        Label1.Text = Server.HtmlEncode(Request.Cookies["userName"].Value);

    if(Request.Cookies["userName"] != null)
    {
        HttpCookie aCookie = Request.Cookies["userName"];
        Label1.Text = Server.HtmlEncode(aCookie.Value);
    }

    多值Cookie编写

    方法一
    Response.Cookies["userInfo"]["userName"] = "patrick";
    Response.Cookies["userInfo"]["lastVisit"] = DateTime.Now.ToString();
    Response.Cookies["userInfo"].Expires = DateTime.Now.AddDays(1);

    方法二

    HttpCookie aCookie = new HttpCookie("userInfo");
    aCookie.Values["userName"] = "patrick";
    aCookie.Values["lastVisit"] = DateTime.Now.ToString();
    aCookie.Expires = DateTime.Now.AddDays(1);
    Response.Cookies.Add(aCookie);

    读取多值Cookie

    if(Request.Cookies["userInfo"] != null)
    {
        Label1.Text =
            Server.HtmlEncode(Request.Cookies["userInfo"]["userName"]);

        Label2.Text =
            Server.HtmlEncode(Request.Cookies["userInfo"]["lastVisit"]);
    }

     删除Cookie

     删除 Cookie(即从用户的硬盘中物理移除 Cookie)是修改 Cookie 的一种形式。由于 Cookie 在用户的计算机中,因此无法将其直接移除。但是,可以让浏览器来为您删除 Cookie。该技术是创建一个与要删除的 Cookie 同名的新 Cookie,并将该 Cookie 的到期日期设置为早于当前日期的某个日期。当浏览器检查 Cookie 的到期日期时,浏览器便会丢弃这个现已过期的 Cookie。

    HttpCookie aCookie;
    string cookieName;
    int limit = Request.Cookies.Count;
    for (int i=0; i<limit; i++)
    {
        cookieName = Request.Cookies[i].Name;
        aCookie = new HttpCookie(cookieName);
        aCookie.Expires = DateTime.Now.AddDays(-1);
        Response.Cookies.Add(aCookie);
    }

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  • 原文地址:https://www.cnblogs.com/jameshappy/p/2031814.html
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