asp.net cookie使用 asp.netcookie|ASP.NET教程

本文概述

HttpCookie示例
码
Cookie收集示例
代码背后

ASP.NET Cookie是一小段文本，用于存储用户特定的信息。每当用户访问站点时，Web应用程序都可以读取此信息。
当用户请求网页时，网络服务器不仅发送页面，还发送包含日期和时间的cookie。该cookie存储在用户硬盘上的文件夹中。
当用户再次请求该网页时，浏览器会在硬盘驱动器上查找与该网页关联的cookie。浏览器为用户访问的每个不同站点存储单独的cookie。
注意：Cookie限于小尺寸，只能用于存储4 KB（4096字节）的文本。在ASP.NET应用程序中有两种存储cookie的方法。

饼干集合
HttpCookie

我们可以将Cookie添加到Cookies集合中，也可以通过创建HttpCookie类的实例来添加。除了HttpCookie要求Cookie名称作为构造函数的一部分外，两者的工作原理相同。
HttpCookie示例在以下示例中，我们将在HttpCookie类的帮助下创建并添加cookie。
// CookieExample.aspx

< %@ Page Language="C#" AutoEventWireup="true" CodeBehind="CookieExample.aspx.cs" Inherits="CoockieExample.CookieExample" %> < !DOCTYPE html> < html xmlns="http://www.w3.org/1999/xhtml"> < head runat="server"> < title>< /title> < /head> < body> < form id="form1" runat="server"> < div> < asp:Label ID="Label1" runat="server" Text="Label">< /asp:Label> < /div> < /form> < /body> < /html>

码// CookieExample.aspx.cs

using System; using System.Web; namespace WebFormsControlls { public partial class CookieExample : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { //-------------- Creating Cookie --------------------------// // Creating HttpCookie instance by specifying name "student" HttpCookie cokie = new HttpCookie("student"); // Assigning value to the created cookie cokie.Value = "http://www.srcmini.com/Rahul Kumar"; // Adding Cookie to the response instance Response.Cookies.Add(cokie); //--------------- Fetching Cookie -------------------------// var co_val= Response.Cookies["student"].Value; Label1.Text = co_val; } } }

Cookie收集示例在以下示例中，我们将cookie直接添加到Cookies集合中。
// Default.aspx

< %@ Page Title="Home Page" Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="CoockieExample._Default" %> < form id="form1" runat="server"> < asp:Label ID="Label1" runat="server" Text="Select Brand Preferences">< /asp:Label> < br /> < br /> < asp:CheckBox ID="apple" runat="server" Text="Apple" /> < br /> < asp:CheckBox ID="dell" runat="server" Text="Dell" /> < br /> < asp:CheckBox ID="lenevo" runat="server" Text="Lenevo" /> < br /> < asp:CheckBox ID="acer" runat="server" Text="Acer" /> < br /> < asp:CheckBox ID="sony" runat="server" Text="Sony" /> < br /> < asp:CheckBox ID="wipro" runat="server" Text="Wipro" /> < br /> < br /> < asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" /> < p> < asp:Label ID="Label2" runat="server">< /asp:Label> < /p> < /form>

代码背后// Default.aspx.cs

using System; using System.Web.UI; namespace CoockieExample { public partial class _Default : Page { protected void Page_Load(object sender, EventArgs e) { // Setting expiring date and time of the cookies Response.Cookies["computer"].Expires = DateTime.Now.AddDays(-1); } protected void Button1_Click(object sender, EventArgs e) { Label2.Text = ""; // --------------- Adding Coockies ---------------------// if (apple.Checked) Response.Cookies["computer"]["apple"]= "apple"; if (dell.Checked) Response.Cookies["computer"]["dell"]= "dell"; if (lenevo.Checked) Response.Cookies["computer"]["lenevo"] = "lenevo"; if (acer.Checked) Response.Cookies["computer"]["acer"]= "acer"; if (sony.Checked) Response.Cookies["computer"]["sony"]= "sony"; if (wipro.Checked) Response.Cookies["computer"]["wipro"]= "wipro"; // --------------- Fetching Cookies -----------------------// if (Request.Cookies["computer"].Values.ToString() != null) { if (Request.Cookies["computer"]["apple"] != null) Label2.Text += Request.Cookies["computer"]["apple"] + " "; if (Request.Cookies["computer"]["dell"] != null) Label2.Text += Request.Cookies["computer"]["dell"] + " "; if (Request.Cookies["computer"]["lenevo"] != null) Label2.Text += Request.Cookies["computer"]["lenevo"] + " "; if (Request.Cookies["computer"]["acer"] != null) Label2.Text += Request.Cookies["computer"]["acer"] + " "; if (Request.Cookies["computer"]["sony"] != null) Label2.Text += Request.Cookies["computer"]["sony"] + " "; if (Request.Cookies["computer"]["wipro"] != null) Label2.Text += Request.Cookies["computer"]["wipro"] + " "; }else Label2.Text = "Please select your choice"; Response.Cookies["computer"].Expires = DateTime.Now.AddDays(-1); } } }

输出：
【asp.net cookie使用】本示例将选择的值存储为cookie。