Named skins in Visual Studio .NET

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Named skins
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The following is a control skin for a Button control that defines the foreground and background colors:
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<asp:Button runat="server" BackColor="lightblue" ForeColor="black" />
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Lesson 2: Using Themes and User Profiles
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Similarly, you can define other attributes, including font attributes:
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<asp:Button runat="server" BackColor="Red" ForeColor="White" Font-Name="Arial" Font-Size="9px" />
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Control skins are exactly like ASP.NET source code for the controls; however, skins never define the control IDs. The easiest way to create a skin file is to follow these steps: 1. Add controls to an .aspx file. 2. Specify the appearance of the controls using the Visual Studio designer. 3. Create a new skin file. To do this with Visual Studio 2005, right-click the name of your theme in Solution Explorer, select Add New Item, and then select the Skin File template. 4. Copy the source for the controls to the skin file. 5. Remove the ID properties from the control definitions in the skin file. Be sure to leave the runat="server" attribute.
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Adding a Cascading Style Sheet to Your Theme A cascading style sheet (CSS) con tains style rules that are applied to elements in a Web page. CSS styles define how ele ments are displayed and where they are positioned on the page. Instead of assigning attributes to each element on your page individually, you can create a general rule that applies attributes whenever a Web browser encounters an instance of an element or an element that is assigned to a certain style class.
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To add a CSS to your Web site, right-click the name of your theme in Solution Explorer, select Add New Item, and then select the Style Sheet template. When the theme is applied to a page, ASP.NET adds a reference to the style sheet to the head ele ment of the page.
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MORE INFO
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Cascading Style Sheets
CSS is not part of ASP.NET; CSS works for any type of Web site. It isn t specifically covered in the exam objectives and won t be covered in detail in this book. However, CSS is still extremely useful, and all Web developers should be familiar with CSS. For more information about CSS, see Cascad ing Style Sheets Overview at http://msdn2.microsoft.com/en-US/library/240ww6sz(VS.80).aspx.
9
Customizing and Personalizing a Web Application
Applying a Theme Programmatically
If you just want to provide a consistent appearance for your Web site, you should spec ify a theme in page declarations or configuration files. This provides a single interface for all users who visit your Web site. You can also give users a choice of themes. While this isn t usually necessary for busi ness Web sites, it s a great way to allow users to customize consumer-oriented portal, forum, and shopping sites. To apply a theme programmatically, set the page s Theme property in the Page_PreInit method. The following code demonstrates how to set the theme based on a query string value; however, this works equally well using cookies or session state:
'VB Protected Sub Page_PreInit(ByVal sender As Object, ByVal e As System.EventArgs) _ Handles Me.PreInit Select Case Request.QueryString("theme") Case "Blue" Page.Theme = "BlueTheme" Case "Pink" Page.Pink = "PinkTheme" End Select End Sub //C# Protected void Page_PreInit(object sender, EventArgs e) {
switch (Request.QueryString["theme"])
case "Blue":
Page.Theme = "BlueTheme";
break;
case "Pink":
Page.Theme = "PinkTheme";
break;
Similarly, you can apply a theme to specific controls by setting the control s SkinID property in the Page_PreInit method. The following code shows how to set the skin for a control named Calendar1:
'VB Sub Page_PreInit(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles Me.PreInit
Calendar1.SkinID = "BlueTheme"
End Sub
Lesson 2: Using Themes and User Profiles
//C# void Page_PreInit(object sender, EventArgs e) {
Calendar1.SkinID = "BlueTheme";
To programmatically apply a style sheet theme (which works just like a theme but doesn t override control attributes), override the StyleSheetTheme property, and in the Get accessor, return the name of the style sheet theme. The following code example shows how to set a theme named BlueTheme as the style sheet theme for a page:
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