Part II Advanced Features in Visual C#.NET

Generator QR in Visual C#.NET Part II Advanced Features

Part II Advanced Features
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The following exercise shows how to create and use a theme .
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Creating and using a theme
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. . 1 . . Add a new form to the MasterPagesSite project . Make this a regular form that doesn t use master pages . Name the page UseThemes.aspx . 2 . . Add a theme folder to your project by right-clicking the Web Site node in Solution Explorer, and clicking Add ASP .NET Folder . Select Theme . This creates an App_Themes directory for you . 3 . . Right-click the App_Themes folder, click Add Folder, and then click Theme Folder . Rename the Theme1 folder Default . 4 . . Add a new style sheet to the Default folder . Right-click the project node in Solution Explorer and click Add New Item . Select the style sheet Template, as shown in the following graphic, and name the style sheet Default .css . Drag the Default .css file into the Themes\Default folder . This is now the style sheet that will apply when the page uses the style named Default .
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5 . . Build the style sheet . The default style sheet includes only a body tag . When the style sheet is open in Visual Studio, select Add Style Rule from the Styles menu . You can right-click the Elements node to modify the style for the node . For example, if you want to change the style of the <h1> tag, right-click the Elements node and click Add Style Rule . To add a style for the <h1> tag, select the style from the list of elements and move it into the Style Rule Hierarchy area by clicking the > button, as shown in the following graphic . Then, click OK .
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7 A Consistent Look and Feel
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To modify the style, click the H1 node in the CSS outline page and select Style in the Properties pane . Click the ellipsis button ( ) to open the Modify Style dialog box, shown in the following graphic, and change the size and weight of the font (or any other aspects) . Then, click OK .
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The sample application included on this book s accompanying CD sets the font to Arial Black, xx-large, bold, and with an underscore . If you look in the CSS file, you ll see that the style has been modified:
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body { } h1 { font-family: Arial, Helvetica, sans-serif; font-size: xx-large; font-weight: bold; text-decoration: underline; }
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Part II Advanced Features
6 . . Now test the theme by declaring it in the page by adding the Theme directive and then by typing a heading with <h1> tags:
<%@ Page Language="C#" AutoEventWireup="true" Theme="Default" CodeFile="UseThemes.aspx.cs" Inherits="UseThemes" %> <!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> <h1> How does this look </h1> </div> </form> </body> </html>
Here s how the themed page appears in the browser with the new theme applied (the <h1> tag set to the new font and to use underlining in this example):
7 A Consistent Look and Feel
7 . . Add another theme to the project and name the theme SeeingRed . That is, create a new theme folder and add a new style sheet called SeeingRed . Set the <h1> tag font color to red this time . Then, change the theme used by the page to SeeingRed (you can also set the theme in the Properties pane in Visual Studio):
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UseThemes.aspx.cs" Theme="SeeingRed" trace="false" Inherits="UseThemes" %>
Surf to the page to see the <h1> tag printed in red . This is just a taste of the kinds of things you can do by using themes in a page . Once you have defined a theme, you can apply it by declaring it as part of the Page declaration or by intercepting the PreInit event and changing the Theme property in the page to a valid theme . Skins, described in the next section, go hand in hand with themes .
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