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In all the examples I ve shown you so far, the application s code had to manually check that the cached element was already in the cache and hadn t been removed in the meantime; the code then had to read the cached element again if necessary:

After you have typed + as shown in Figure 17-7, IntelliSense in Visual Studio will offer to create the delegate for the event handler if you press the Tab key. When you press Tab, you are invited to press it again, as shown in Figure 17-8.

If Cache( Employees ) Is Nothing Then CacheEmployeesData() End If Get the cached data. Dim xmldoc As System.Xml.XmlDocument = _ DirectCast(Cache( Employees ), System.Xml.XmlDocument)

Step 2 of the Mail Merge Wizard appears in the Mail Merge task pane, so that you can add data elds to your publication.

This coding style is clumsy and adds a slight overhead each time you access an object. Fortunately, you can solve both problems by specifying a delegate to a callback proZ cedure in the last argument of the Insert and Add methods. This procedure is invoked by ASP.NET immediately after removing the element from the cache. Here s a protoZ type of the callback procedure that s invoked when the element is removed. As you see, its last argument lets you understand what exactly happened:

Sub OnRemoveItem(ByVal key As String, ByVal value As Object, _ ByVal reason As Caching.CacheItemRemovedReason) Select Case reason Case Caching.CacheItemRemovedReason.Expired The element expired. Case Caching.CacheItemRemovedReason.DependencyChanged The element depends on files/keys that have changed. Case Caching.CacheItemRemovedReason.Removed The element has been removed by a Remove method, or by an Insert method on the same key. Case Caching.CacheItemRemovedReason.Underused The element has been removed because of memory shortage. End Select End Sub

The following code shows how you can update the sample application to use this feaZ ture. Note that I moved both functions into a module and accessed the Cache object by using the HttpRuntime.Cache property because I m outside a Page class:

If you press Tab a second time, the event handler is created automatically, although it just contains a statement that will throw an exception if the method is ever called. You should end up with code that looks like the following:

Module CacheFunctions Save a reference to the Cache object. Dim Cache As System.Web.Caching.Cache = HttpRuntime.Cache Sub CacheEmployeesData() Read an XML document. Dim filename As String = MapPath( employees.xml ) Dim xmldoc As New System.Xml.XmlDocument() xmldoc.Load(filename) Make this item expire when the file is modified, and

Dim xmldocDep As New System.Web.Caching.CacheDependency(filename)

The Insert Address Block dialog box opens. From this dialog box, you can re ne the format of the elds that constitute the name and address.

Part VI:

Cache.Insert( Employees", xmldoc, xmldocDep, Nothing, Nothing, _ Caching.CacheItemPriority.Default, AddressOf OnRemoveItem) End Sub Sub OnRemoveItem(ByVal key As String, ByVal value As Object, _ ByVal reason As Caching.CacheItemRemovedReason) Always refresh the XML file when the cached item expires. CacheEmployeesData() End Sub End Module

The technique based on callbacks is most effective when the data is cached the first time inside the Application_Start event in Global.asax. Because the code is in a module (and not in a Page class), you can access these routines from Global.asax:

protected override void Initialize() { accel = new Accelerometer(); accel.ReadingChanged += new EventHandler<AccelerometerReadingEventArgs>(accel_ReadingChanged); base.Initialize(); } void accel_ReadingChanged(object sender, AccelerometerReadingEventArgs e) { throw new NotImplementedException(); }

Global.asax partial listing Public Class Global Inherits System.Web.HttpApplication Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs) Cache the XML file when the application starts. CacheEmployeesData() End Sub End Class

You can now reference the cached element from anywhere in your ASP.NET applicaZ tion without testing it for Nothing first because the XML file is automatically recached when it s modified:

3

You can place this statement in any .aspx page. Public xmldoc As System.Xml.XmlDocument = _ DirectCast(Cache( Employees ), System.Xml.XmlDocument)

ASP.NET offers another means for storing application-wide values that isn t available under ASP and can work as a viable alternative to standard application variables. Because your code is compiled and runs inside an ASP.NET working process (aspnet_wp.exe under Windows 2000 and XP, w3wp.exe under Windows Server 2003) until the process is shut down or recycled, any static variable in your project will preserve its value between client requests. Consider this simple Module block: