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What s a Master Page, Anyway
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A master page is similar to an ordinary ASP.NET page except for the top @Master directive and the presence of one or more ContentPlaceHolder server controls. In addition, a master page doesn t derive from Page but has UserControl as its parent class. A ContentPlaceHolder control defines a region in the master page that can be customized in a derived page. A master page without content placeholders is technically correct and will be processed correctly by the ASP.NET runtime. However, a placeholder-less master fails in its primary goal to be the super-template of multiple pages that look alike. A master page devoid of placeholders works like an ordinary Web page but with the extra burden required to process master pages.
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8
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Page Composition and Usability
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Here is a simple master page adapted from the master page of the Visual Studio 2010 sample ASP.NET project:
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<%@ Master Codebehind=.Site.master.cs. Inherits=.YourApp.SiteMaster. %> <html> <head runat="server"> <title></title> <link href="~/Styles/Site.css" rel="stylesheet" type="text/css" /> <asp:ContentPlaceHolder ID="HeadContent" runat="server"> </asp:ContentPlaceHolder> </head> <body> <form runat="server"> <div class="page"> <div class="header"> <div class="title"><h1> Programming ASP.NET 4 </h1></div> <div class="loginDisplay"> ... </div> <div class="clear menu"> ... </div> </div> <div class="main"> <asp:ContentPlaceHolder ID="MainContent" runat="server"/> </div> <div class="clear"></div> </div> <div class="footer"> ... </div> </form> </body> </html>
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As you can see, the master page looks like a standard ASP.NET page. Aside from the identifying @Master directive, the only key differences are ContentPlaceHolder controls. A page bound to this master automatically picks up the layout and contents of the master and can attach custom markup and server controls to each defined placeholder. The content placeholder element is fully identified by its ID property and normally doesn t require other attributes. This is important to note because a content page is not allowed to include any content other than the markup strictly required to fill up a specific content placeholder. I ll return to this point in a moment.
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The @Master Directive
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The @Master directive distinguishes master pages from content pages and allows the ASP.NET runtime to properly handle each. A master page file is compiled to a class that derives from the MasterPage class. The MasterPage class, in turn, inherits UserControl. So, at the end of the day, a master page is treated as a special kind of ASP.NET user control.
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Part II
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ASP.NET Pages and Server Controls
The @Master directive supports quite a few attributes. For the most part, though, they are the same attributes that we reviewed in 5, Anatomy of an ASP.NET Page, for the @Page directive. Table 8-1 details the attributes that have a special meaning to master pages.
TABLE 8-1
Attributes of the @Master Directive
Description
Specifies the name for the class that will be created to render the master page. This value can be any valid class name but should not include a namespace. By default, the class name for a simple.master is ASP.simple_master. Indicates the file that contains any source code associated with the master page, and is used for a Web Application Project (WAP). Note that the CodeBehind attribute is ignored by ASP.NET and simply exists to help Visual Studio edit the file. You can remove it in production without losing functionality.
Attribute
ClassName
CodeBehind
CodeFile Inherits MasterPageFile
Indicates the file that contains any source code associated with the master page, and is used for a Web site project. Specifies a code-behind class for the master page to inherit. This can be any class derived from MasterPage. Specifies the name of the master page file that this master refers to. A master can refer to another master through the same mechanisms a page uses to attach to a master. If this attribute is set, you will have nested masters.
The master page is associated with a code file that looks like the following:
public partial class SiteMaster: System.Web.UI.MasterPage { protected void Page_Load(Object sender, EventArgs e) { ... } ... }
The @Master directive doesn t override attributes set at the @Page directive level. For example, you can have the master set the language to Visual Basic and one of the content pages can instead use C#. The language set at the master page level never influences the choice of the language at the content page level. Likewise, you can use other ASP.NET directives in a master page for example, @Import. However, the scope of these directives is limited to the master file and does not extend to child pages generated from the master.
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