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The following example shows an exceedingly simple custom cache dependency class. This class uses a timer to periodically check if a cached item is still valid. The first step is to create the class by deriving from CacheDependency: public class TimerTestCacheDependency : CacheDependency { ... } When the dependency is first created, you can set up the timer. In this example, the polling time isn t configurable it s hard-coded at 5 seconds. That means every 5 seconds the timer fires and the dependency check runs. private Timer timer; private int pollTime = 5000; public TimerTestCacheDependency() { // Check immediately and then wait the poll time // for each subsequent check (same as CacheDependency behavior). timer = new Timer(new TimerCallback(CheckDependencyCallback), this, 0, pollTime); }

Figure 12-3. Searching for information in an XML document You can also search portions of an XML document by using the method XmlElement.GetElementsByTagName() on a specific element. In this case, the XmlDocument searches all the descendant nodes looking for a match. To use this method, first retrieve an XmlNode that corresponds to an element and then cast this object to an XmlElement. The following example demonstrates how to use this technique to find the stars of a specific movie: // Load the XML file. string xmlFile = Server.MapPath("DvdList.xml"); XmlDocument doc = new XmlDocument(); doc.Load(xmlFile); // Find all the <Title> elements anywhere in the document. StringBuilder str = new StringBuilder(); XmlNodeList nodes = doc.GetElementsByTagName("Title"); foreach (XmlNode node in nodes) { str.Append("Found: <b>");

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This function retrieves elements based on what text a contained element starts with. /DvdList/DVD[starts-with(Title, 'P')] finds all <DVD> elements that have a <Title> element that contains text that starts with the letter P. This function retrieves elements based on position. /DvdList/DVD[position()=2] selects the second <DVD> element. A handy shorthand for this is to use [2]. Note also that numbering begins at 1 not 0 . This function counts the number of nodes with the matching name. count(DVD) returns the number of <DVD> elements.

As a test, the dependency check simply counts the number of times it s called. Once it s called for the fifth time (after a total of about 25 seconds), it invalidates the cached item. The important part of this example is how it tells ASP.NET to remove the dependent item. All you need to do is call the base CacheDependency.NotifyDependencyChanged() method, passing in a reference to the event sender (the current class) and any event arguments. private int count = 0; private void CheckDependencyCallback(object sender) { // Check your resource here. If it has changed, notify ASP.NET: count++; if (count > 4) { // Signal that the item is expired. base.NotifyDependencyChanged(this, EventArgs.Empty); // Don't fire this callback again. timer.Dispose(); } } The last step is to override DependencyDispose() to perform any cleanup that you need. DependencyDispose() is called soon after you use the NotifyDependencyChanged() method to invalidate the cached item. At this point, the dependency is no longer needed. protected override void DependencyDispose() { // Cleanup code goes here. if (timer != null) timer.Dispose(); } Once you ve created a custom dependency class, you can use it in the same way as the CacheDependency class, by supplying it as a parameter when you call Cache.Insert(): TimerTestCacheDependency dependency = new TimerTestCacheDependency(); Cache.Insert("MyItem", item, dependency);

// Show the text contained in this <Title> element. string name = node.ChildNodes[0].Value; str.Append(name); str.Append("</b><br />"); if (name == "Forrest Gump") { // Find the stars for just this movie. // First you need to get the parent node // (which is the <DVD> element for the movie). XmlNode parent = node.ParentNode; // Then you need to search down the tree. XmlNodeList childNodes = ((XmlElement)parent).GetElementsByTagName("Star"); foreach (XmlNode childNode in childNodes) { str.Append("   Found Star: "); str.Append(childNode.ChildNodes[0].Value); str.Append("<br />"); } } } XmlText.Text = str.ToString(); Figure 12-4 shows the result of this test.

To execute an XPath expression in .NET, you can use the Select() method of the XPathNavigator or the SelectNodes() or SelectSingleNode() method of the XmlDocument class. The following code uses this technique to retrieve specific information: ' Load the XML file. Dim xmlFile As String = Server.MapPath("DvdList.xml") Dim doc As New XmlDocument() doc.Load(xmlFile) ' Retrieve the title of every science-fiction movie. Dim nodes As XmlNodeList = doc.SelectNodes("/DvdList/DVD[@Category='Science Fiction']/Title") ' Display the titles. Dim str As New StringBuilder() For Each node As XmlNode In nodes str.Append("Found: <b>") ' Show the text contained in this <Title> element. str.Append(node.ChildNodes(0).Value) str.Append("</b><br />") Next XmlText.Text = str.ToString() Figure 12-5 shows the results.

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