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.
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