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  • ASP.NET_读写Cookie

    Cookie (HttpCookie的实例)提供了一种在 Web 应用程序中存储用户特定信息的方法。例如,当用户访问您的站点时,您可以使用 Cookie 存储用户首选项或其他信息。当该用户再次访问您的网站时,应用程序便可以检索以前存储的信息。


    创建Cookie方法 (1)
    Response.Cookies["userName"].Value = “admin";
    Response.Cookies[“userName”].Expires = DateTime.Now.AddDays(1);
    //如果不设置失效时间,Cookie信息不会写到用户硬盘,浏览器关闭将会丢弃。


    创建Cookie方法 (2)
    HttpCookie aCookie = new HttpCookie(“lastVisit”); //上一次访问时间
    aCookie.Value = DateTime.Now.ToString();
    aCookie.Expires = DateTime.Now.AddDays(1);
    Response.Cookies.Add(aCookie);


    访问Cookie方法(1)
    if(Request.Cookies["userName"] != null)
    Label1.Text = Server.HtmlEncode(Request.Cookies["userName"].Value);

    访问Cookie方法(2)
    if(Request.Cookies["userName"] != null)
    {
    HttpCookie aCookie = Request.Cookies["userName"];
    Label1.Text = Server.HtmlEncode(aCookie.Value);
    }


    创建多值Cookie方法 (1)
    Response.Cookies["userInfo"]["userName"] = “admin";
    Response.Cookies["userInfo"]["lastVisit"] = DateTime.Now.ToString();
    Response.Cookies["userInfo"].Expires = DateTime.Now.AddDays(1);


    创建多值Cookie方法 (2)
    HttpCookie aCookie = new HttpCookie("userInfo");
    aCookie.Values["userName"] = “admin";
    aCookie.Values["lastVisit"] = DateTime.Now.ToString();
    aCookie.Expires = DateTime.Now.AddDays(1);
    Response.Cookies.Add(aCookie);


    读取多值Cookie
    HttpCookie aCookie = Request.Cookies["userInfo"];
    string userName=aCookie.Values[“userName”];
    string lastVisit=aCookie.Values[“lastVisit”];

     

    修改和删除Cookie
    不能直接修改或删除Cookie,只能创建一个新的Cookie,发送到客户端以实现修改或删除Cookie.

     

    Cookie存入文字时要注意先编码后存放
    例如
    HttpCookie cookieSF = Request.Cookies["SearchFoot"];
    cookieSF.Values["MianJi"] =  Server.UrlEncode( strSaveText);

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  • 原文地址:https://www.cnblogs.com/longyi/p/1533802.html
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