asp.net之cookie（设置css）

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cookie是asp.net中跨页面传值的方法之一，通过cookie可以对页面的css进行设置。

以下是一个例程：

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title></title></head><body>    <form id="form1" runat="server">    <div>            <asp:Label ID="Lab_css" runat="server" Text="Label" CssClass="" ></asp:Label>        <br />        <br />        <asp:DropDownList ID="lab_color" runat="server">            <asp:ListItem Value="blue">blue</asp:ListItem>            <asp:ListItem Value="green">green</asp:ListItem>            <asp:ListItem Value="red">red</asp:ListItem>        </asp:DropDownList>        <asp:DropDownList ID="lab_fontsize" runat="server">            <asp:ListItem Value="3px">3px</asp:ListItem>            <asp:ListItem Value="2em">2em</asp:ListItem>            <asp:ListItem Value="1em">1em</asp:ListItem>        </asp:DropDownList>            <br />        </div>    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />    </form></body></html>

Default.aspx.css

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;public partial class _Default : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        if (!IsPostBack)        {            HttpCookie _hk = Request.Cookies["testCss"];            if (_hk != null)            {                string _color = _hk.Values[<span style="color:#ff0000;">"color"</span>];// 注意与button1_click事件中的cookie子键名对应，切记                string _fontsize = _hk.Values["fs"];                Lab_css.Style.Add("color", _color);                Lab_css.Style.Add("font-size", _fontsize);            }        }    }    protected void Button1_Click(object sender, EventArgs e)    {        string _color, _fs;        _color = lab_color.SelectedValue;        _fs = lab_fontsize.SelectedValue;        HttpCookie _hk = new HttpCookie("testCss");        _hk.Values.Add("color", _color);        _hk.Values.Add("fs", _fs);        _hk.Expires = DateTime.MaxValue;        Response.Cookies.Add(_hk);     //   Response.Write(lab_color.SelectedValue);        Lab_css.Style.Add("color", _color);        Lab_css.Style.Add("font-size", _fs);    }}

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