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The SiteMapDataSourceStartingNodeOffset property takes the most getting used to It takes an integer that instructs the SiteMapDataSource to move that many levels down the tree (if the number is positive) or up the tree (if the number is negative) The important detail that s often misunderstood is that when the SiteMapDataSource moves down the tree, it moves toward the current node If it s already at the current node, or your offset takes it beyond the current node, the SiteMapDataSource won t know where to go, and you ll end up with a blank navigation control To understand how this works, it helps to consider an example.

The following class is a custom HTTP module that handles the event HttpApplication.AuthenticateRequest and then logs the user information to a new entry in the Windows event log using the EventLog class from the System.Diagnostics namespace. To use this example, the account used to run ASP.NET code must have permission to write to the event log. using System; using System.Web; using System.Diagnostics; namespace HttpExtensions { public class LogUserModule : IHttpModule { public void Init(HttpApplication httpApp) { // Attach application event handlers. httpApp.AuthenticateRequest += new EventHandler(OnAuthentication); } private void OnAuthentication(object sender, EventArgs a) { // Get the current user identity. string name = HttpContext.Current.User.Identity.Name; // Log the user name. EventLog log = new EventLog(); log.Source = "Log User Module"; log.WriteEntry(name + " was authenticated."); } public void Dispose() {} } } Now you can register the module with the following information in the web.config file. Here s an example that assumes it s compiled in a separate assembly named HttpExtensions.dll: <httpModules> <add name="LogUserModule" type="HttpExtensions.LogUserModule,HttpExtensions" /> </httpModules> To test this module, request any other page in the web application. Then check the entry in the Windows application event log. (To view the log, select Programs Administrative Tools Event Viewer from the Start menu.) Figure 5-15 shows the logged messages.

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Command (Hot Key)

Imagine you re at this location in a website: Home > Products > Software > Custom > Contact Us If the SiteMapDataSource is starting at the Home node (the default), and you apply a StartingNodeOffset of 2, it will move down the tree two levels and bind this portion: Software > Custom > Contact Us That means you ll be able to jump to any links in the Software or Custom groups, but you won t be able to go anywhere else (at least not without stepping up a level first or clicking another control) If you click the Custom link, the bound control will now show a tree with this information: Products > Software > Custom Now, what happens if you repeat the same test but set the site map provider to begin on another node Consider what happens if you set StartFromCurrentNode to true ASP .

Figure 5-15. Logging messages with an HTTP module In Part 4, you ll see a more detailed example that uses an HTTP module to perform custom authentication.

Step Into (F11)

NET tries to move two levels down the hierarchy, starting from Contact Us But because it s already at the current page, it has nowhere to go and can t get any navigational information On the other hand, if you set StartFromCurrentNode to true and use a StartingNodeOffset of 2, the SiteMapDataSource will move up two levels from Contact Us and bind this tree: Software > Custom > Contact Us It may take a bit of experimenting to decide the right combination of SiteMapDataSource settings that you want to use..

The previous example shows how you can handle application events in a custom HTTP module. However, some global events aren t provided by the HttpApplication class but are still quite important. These include events raised by other HTTP modules, such as the events fired to start and end a session. Fortunately, you can wire up to these events in the Init() event; you just need a slightly different approach. The HttpApplication class provides a collection of all the modules that are a part of the current HTTP pipeline through the Modules collection. You can retrieve a module by name and then use delegate code to connect an event handler. For example, if you want to connect an event handler named OnSessionStart() to the SessionStateModule.Start event, you could use code like this for the Init() method in your HTTP module: public void Init(HttpApplication httpApp) { SessionStateModule sessionMod = httpApp.Modules["Session"]; sessionMod.Start += new EventHandler(OnSessionStart); }

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