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温故知新ASP.NET 2.0(C#)(2) - Themes(主题)


作者:webabcd


介绍
使用 ASP.NET 2.0 的“主题”功能,可以将样式和布局信息分解为单独的文件组,统称为“主题”。然后,主题可应用于任何站点,影响站点中页和控件的外观。这样,通过更改主题即可轻松地维护对站点的样式更改,而无需对站点各页进行编辑。还可与其他开发人员共享主题。


关键
1、在web site中添加App_Themes文件夹,可以在每个主题文件加内添加.skin文件、.css文件(指定主题后会自动加载主题下所有.css文件)或者图片文件

2、在web.config的<system.web>元素下的<pages>元素下设置theme或者styleSheetTheme属性(针对全局);在页的@Page指令里设置Theme或者StylesheetTheme属性(针对当前页)

3、Theme定义的样式不可以覆盖;StylesheetTheme定义的样式可以覆盖

4、.skin文件里不设置SkinId则就是默认的,设置了SkinId后则对应控件的SkinId属性

5、动态修改Page的Theme要在Page_PreInit方法中实现


示例
Blue主题
<asp:Label runat="server" BackColor="blue" ForeColor="white" />
<asp:Label runat="server" BackColor="DarkBlue" ForeColor="white" SkinId="Dark" />

<%--ImageUrl如下设置则解析到该主题下的Images文件夹的pic.jpg文件--%>
<asp:Image runat="server" ImageUrl="Images/pic.jpg" />
 
Red主题
<asp:Label runat="server" BackColor="red" ForeColor="white" />
<asp:Label runat="server" BackColor="DarkRed" ForeColor="white" SkinId="Dark" />

<%--ImageUrl如下设置则解析到该主题下的Images文件夹的pic.jpg文件--%>
<asp:Image runat="server" ImageUrl="Images/pic.jpg" />
 
 
主题测试-Theme
Themes/Theme.aspx
<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Theme.aspx.cs"
        Inherits="Themes_Theme" Title="主题测试-Theme" Theme="Blue" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
        <p>
                在页头部分指定Theme="Blue"</p>
        <p>
                相关主题文件,我觉得最好把样式写在css里然后设置控件的CssClass属性
                <br />
                <asp:Label ID="Label1" runat="server" BackColor="blue" ForeColor="white" />
                <br />
                <asp:Label ID="Label2" runat="server" BackColor="DarkBlue" ForeColor="white"
                SkinId="Dark" />
        </p>
        <p>
                <asp:Label ID="lbl" runat="Server" Text="不做任何设置(使用主题中的没设置SkinId的样式)" />
        </p>
        <p>
                <asp:Label ID="lbl2" runat="Server" Text="设置BackColor为black(因为设置的是页的Theme属性,所以无法覆盖原有样式)" BackColor="black" />
        </p>
        <p>
                <asp:Label ID="lbl3" runat="Server" Text="主题测试设置SkinID为dark(指定SkinId)" SkinID="dark" />
        </p>
</asp:Content>
 
 
主题测试-StylesheetTheme
Themes/StylesheetTheme.aspx
<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="StylesheetTheme.aspx.cs"
        Inherits="Themes_StylesheetTheme" Title="主题测试-StylesheetTheme" StylesheetTheme="Red" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
        <p>
                在页头部分指定StylesheetTheme="Red"</p>
        <p>
                相关主题文件,我觉得最好把样式写在css里然后设置控件的CssClass属性
                <br />
                <asp:Label ID="Label1" runat="server" BackColor="red" ForeColor="white" />
                <br />
                <asp:Label ID="Label2" runat="server" BackColor="DarkRed" ForeColor="white" SkinId="Dark"
                />
        </p>
        <p>
                <asp:Label ID="lbl" runat="Server" Text="不做任何设置(使用主题中的没设置SkinId的样式)" />
        </p>
        <p>
                <asp:Label ID="lbl2" runat="Server" Text="设置BackColor为black(因为设置的是页的StylesheetTheme属性,所以可以覆盖原有样式)" BackColor="black" />
        </p>
        <p>
                <asp:Label ID="lbl3" runat="Server" Text="主题测试设置SkinID为dark(指定SkinId)" SkinID="dark" />
        </p>
</asp:Content>
 
 
主题测试-动态加载主题
Themes/Dynamic.aspx
<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Dynamic.aspx.cs"
        Inherits="Themes_Dynamic" Title="主题测试-动态加载主题" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
        <p>
                相关.skin文件内容如下:<asp:Image runat="server" ImageUrl="Images/pic.jpg" />
        </p>
        <p>
                <a href="?theme=blue">蓝色主题</a>  <a href="?theme=red">红色主题</a>
        </p>
        <p>
                该Image控件应用主题中的样式,包括ImageUrl
                <br />
                <asp:Image ID="img" runat="server" />
        </p>
</asp:Content>
 
Themes/Dynamic.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Themes_Dynamic : System.Web.UI.Page
{
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Page_PreInit(object sender, System.EventArgs e)
        {
                // 动态修改Page的Theme要在Page_PreInit方法中实现
                if (!String.IsNullOrEmpty(Request.QueryString["theme"]))
                {
                        Page.Theme = Request.QueryString["theme"];
                }
                else
                {
                        Page.Theme = "blue";
                }
        }
}