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To revert to the code-behind model, remove the script block and add the Inherits attribute to the Application directive: <%@ Application Language="C#" Inherits='MyImpl' %> Now add a class file to the App_Code directory of your project and name it MyImpl (or whatever class you named with the Inherits attribute). Have this class use HttpApplication as its base class: public class MyImpl : HttpApplication { } This will leverage the ASP .NET 1.x model for the global.asax, with the exception that, by default, the class isn t compiled until runtime (as is the case for any class in the code directory). The type will still show up via IntelliSense in the IDE, and you can still code against it in a strongly typed manner. To trap HttpApplicaiton events, you now have two options. The aforementioned naming convention will work. Or you can add delegates to the base class events from the constructor. The following class traps both the BeginRequest and PreRequestHandlerExecute events: one by explicitly creating the trap; the other by using the naming convention. It also declares a static field that will be available throughout the application: using System; using System.Web; public class MyImpl : HttpApplication { public static string SomeStaic = "This is a static variable"; public MyImpl() { this.PreRequestHandlerExecute += new EventHandler(MyImpl_PreRequestHandlerExecute); } void Application_OnBeginRequest(object sender, EventArgs e) { Response.Write("Entering BeginRequest<BR>"); } void MyImpl_PreRequestHandlerExecute(object sender, EventArgs e) { Response.Write("Entering PreRequestHandlerExecute<BR>"); } }
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There s no runtime difference between these techniques: one relies on a naming convention and magic behind the scenes, and the other clearly documents the existence of the event trap and allows you to use method names of your own choosing. You can use the following Web Form to exercise your HttpApplication derived class. Here s the markup for Default.aspx: <%@ Page Language="C#" CodeFile="Default.aspx.cs" Inherits="_Default" %> And here s the code from Default.aspx.cs: public partial class Default_aspx { protected override void OnInit(EventArgs e) { this.Load +=new EventHandler(Default_aspx_Load); this.PreRender +=new EventHandler(Default_aspx_PreRender); } void Default_aspx_Load(object sender, EventArgs e) { Response.Write(MyImpl.SomeStaic + "<BR>"); } void Default_aspx_PreRender(object sender, EventArgs e) { Response.Write("<b>Page Handler Fired</b><BR>"); } } Notice in the ASPX file that all of the markup has been removed. You should do this whenever you use Response.Write, because using this method pre-empts the page-rendering process. Requesting the page produces the results shown in Figure 2-5. The first two lines are output during preprocessing, before the Default_aspx type has executed. The last two lines are output by the page processing, and the first of the two here accesses and outputs the static field declared on your HttpApplication class. Note that this value is shared across pages and across users. A change made for one user will be reflected for all users. Any modifications to it must be synchronized to be thread safe. If the type requires more complex construction semantics, you can add a static constructor to your derived type, as in this example: public static DataSet StateList; static MyImpl() { StateList = new DataSet(); StateList.ReadXml("http://www.IntertechTraining.com/StateList.xml"); }
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Figure 2-5. Output of the Default.aspx page in an application with our custom global.asax One final note about inheriting from HttpApplication: Using the strategies outlined here, the actual global.asax is nothing more than an Application directive. In Visual Studio .NET 2003, the IDE won t actually show the contents of this file; it has to be opened from the file system with another editor to see the directive. Now in Visual Studio .NET 2005, it won t give you a code-behind. Fickle. Figure 2-6 displays your options when you add a new Global Application Class.
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Figure 2-6. The Visual Studio .NET 2005 dialog for adding a Global Application Class. Notice the option to Place code in separate file is disabled.
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