vb.net code 39 generator source C02620245.fm Page 60 Wednesday, June 9, 2004 5:24 PM in .NET

Maker Code 128 Code Set B in .NET C02620245.fm Page 60 Wednesday, June 9, 2004 5:24 PM

C02620245.fm Page 60 Wednesday, June 9, 2004 5:24 PM
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Part I ASP.NET Essentials
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Importing Compiled Templates
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Any ASP.NET page bound to a master page must have a certain structure no server controls or literal text are allowed outside the <asp:Content> tag. As a result, the layout of the page looks like a plain collection of content elements, each bound to a particular placeholder in the master. The connection is established through the ID property. The <asp:Content> element works like a control container, much like the Panel control of ASP.NET or the HTML <div> tag. All the markup text is compiled to a template and associated with the corresponding placeholder property on the master class. The master page is a special kind of user control. In fact, the ASP.NET Framework calls the InitializeAsUserControl method an internal method on the UserControl class which completes the initialization phase of user controls. The method wires automatic event handlers (such as Page_Load, Page_Unload) to the control. The construction of the final page continues with the addition of the filled master page to the control tree of the current instance of the page. No other controls are present in the final page except those brought in by the master. Figure 2-4 shows the skeleton of the final page served to the user.
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<asp:Content> for the placeholder compiled as an ITemplate object
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Placeholder 1
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Placeholder n ASP .simple_master (Master) ASP .test_aspx (Content page)
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<asp:Content> for the placeholder compiled as an ITemplate object
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Figure 2-4 The structure of the final page in which the master page and the content page are merged
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F02DR04
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Nested Masters
So far we ve seen a pretty simple relationship between a master and a collection of content pages. However, the topology of the relationship can be made as complex and sophisticated as needed. A master can, in fact, be associated with another master and form a hierarchical, nested structure. Figure 2-5 shows an example.
C02620245.fm Page 61 Wednesday, June 9, 2004 5:24 PM
2 Working with Master Pages
Parent.master ParentPlaceHolder
Child.master ChildPlaceHolder1 ChildPlaceHolder2 ContentPage.aspx Content of ParentPlaceHolder Content of ChildPlaceHolder1 Content of ChildPlaceHolder2
Figure 2-5 Complex sites (such as portals) require the use of interrelated master pages that end up forming a hierarchical structure.
F02DR05
Designing Nested Masters
When nested masters are used, any child master is seen and implemented as a plain content page in which extra ContentPlaceHolder controls are defined for an extra level of content pages. Put another way, a child master is a content page that contains a combination of <asp:Content> and <asp:ContentPlaceHolder> elements. Like any other content page, a child master points to a master page and provides content blocks for its parent s placeholders. At the same time, it makes available new placeholders for its child pages. There s no architectural limitation in the number of nesting levels you can implement in your Web sites. Performance-wise, the depth of the nesting has a negligible impact on the overall functionality and scalability of the solution. The final page served to the user is always compiled on demand and never modified as long as dependent files are not touched. Let s extend the previous example so it encompasses a nested structure of master pages.
Building an Example
Many Web sites most of them portals have such a complex structure that they can t be rendered using a flat master/content relationship. Suppose you need to have a global menu on top of the page and then a second-level menu whose options vary quite a bit depending on which logical group the page belongs to. In addition, suppose that the second-level menu is not the only visual element to be displayed a search box or a login text box is also required.
C02620245.fm Page 62 Wednesday, June 9, 2004 5:24 PM
Part I ASP.NET Essentials
Even from this simple description, it s clear that the portal contains two distinct sets of widgets. Hence, two distinct but interrelated masters are needed to render it in code. The parent master (BookSample.master) defines the overall layout of the pages header, body, and footer. The child master (Body.master) expands the body for a certain group of pages, meaning that the Web site will be made of pages belonging to different groups, each with a differently laid out structure. We define a child master in which a toolbar is expected. The content page is responsible for providing the buttons for the toolbar. We ll use a slightly modified version of the BookSample.master page we considered earlier as the parent master in this example. Here s the code:
<%@ Master Language="C# %> <html> <head> <link rel="Stylesheet href="/intro20/styles.css /> <title>Master Page</title> </head> <body style="margin:0;font-family:verdana;"> <form runat="server"> <table width="100% bgcolor="beige style="BORDER-BOTTOM:silver 5px solid"> <tr> <td><h1>Introducing ASP.NET 2.0</h1></td> </tr> </table> <br> <table width="100% style="border:solid 1px black;"> <tr><td> <asp:contentplaceholder runat="server id="Toolbar /></td></tr> <tr><td> <asp:contentplaceholder runat="server id="PageBody /></td></tr> <tr><td align="center style="background-color:lightcyan;"> All rights reserved.</td></tr> </table> </form> </body> </html>
The following code shows the source of the child master a file named Body.master:
<%@ Master Language="VB MasterPageFile="BookSample.master %> <asp:content runat="server contentplaceholderID="Toolbar"> <table width="100%"> <tr bgcolor="lightcyan"> <td width="100%"><h3>Great choice!</h3></td>
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