Accessing Master Page at Run Time
The ASP.NET Framework offers the possibility to access Master Pages programmatically during run time. You can use this as a basis for individual enhancements and changes. The Content Page offers the Master property, which is marked as protected. This way, you get an instance on the individual Master Page, from which you get access to the public properties and methods.
The assignment of an individual page title is a typical example for the application. The files in Listing 4-3 show this using a Literal control placed on the Master Page. The text is assigned through a custom and public property, HtmlTitle, which passes the text to the label.
Listing 4-3: Access Any Public Members Through the Master Properties
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// MasterPage3.master <%@ master language="C#" %> <script runat="server"> public string HtmlTitle { get { return this.LT_HtmlTitle.Text; } set { this.LT_HtmlTitle.Text = value; } } </script> <html> <head runat="server"> <title><ASP:Literal runat="server" /></title> </head> <body> <form runat="server"> <asp:contentplaceholder runat="server"> </asp:contentplaceholder> </form> </body> </html> // ContentPage3.aspx <%@ page language="C#" master="~/MasterPage3.master" %> <script runat="server" language="c#"> void Page_Load(object sender, System.EventArgs e) { this.Master.HtmlTitle = "Hello World!"; } </script> |
If you intend to define meta tags dynamically, I recommend you use the page's Header object, which implements IPageHeader. The object gives access to meta tags, external CSS files, and any style sheets defined globally on that page. The approach shown in Listing 4-4 works well in Master Pages, Content Pages, and normal pages.
Listing 4-4: Assigning Custom Meta Tags
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<%@ page language="C#" master="~/MasterPage4.master" %> <script runat="server" language="c#"> void Page_Load(object sender, System.EventArgs e) { this.Master.HtmlTitle = "Hello World!"; this.Header.Metadata.Add("Author", "Patrick A. Lorenz"); } </script> |
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