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Figure 6-6: The sample application sorts nodes by title and lastname To generate the output shown in this figure, I made use of an XPath iterator to visit all the nodes and their own subtrees We'll examine this code in detail in the section "Visiting the Selected Nodes," on page 286, but first we'll take a look at the internal layout of the XML document classes the navigator relies on XPath Data Stores As mentioned, an XPath navigator works on top of an ad hoc document class The NET Framework provides three XPath-enabled classes: XmlPathDocument, XmlDocument, and XmlDataDocument These classes have in common the IXPathNavigable interface In theory, each NET Framework class can become XPath-enabled In practice, however, only a subset of classes is a good candidate In the first place, the class must act as the in-memory repository of some sort of content.

Second, this content must be, or must be exposed as, XML When these two prerequisites are met, classes can reasonably implement the IXPathNavigable interface and create their own navigators An XPath navigator is always class-specific and is built by inheriting from the abstract class XPathNavigator Although in practice you always use navigators through the generic reference type of XPathNavigator, each class has its own navigator object Table 6-9 lists these internal, undocumented classes; they are programmatically unaccessible, and often each is implemented in a different way Despite this complexity, however, the classes' application-level programming interface is common and is based on their base class XPathNavigator Table 6-9: Document-Specific Navigator Classes Document Class Corresponding Internal Navigator Class XPathDocument SystemXmlXPathXPathDocumentNavigator XmlDocument SystemXmlDocumentXPathNavigator XmlDataDocument SystemXmlDataDocumentXPathNavigator The document-specific navigator exploits the internal layout of the document class to provide the navigation API.

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A document-specific navigator can also have new methods and properties that make sense to a particular implementation In this case, however, 229.

You have more options, including automatic republishing and interactivity, when you save a selection as a web page. To save a selection, open the workbook and then select the content you wish to save as a web page. Valid selections include the following: A worksheet (select any single cell on the sheet) A range A chart A PivotTable report (select the entire pivot table) Select the cells, PivotTable report, or chart that you want to save as a web page, then choose File Save as Web Page. In the Save options, choose Selection instead of Entire Workbook. Edit the file name if you wish. Click the Publish button to open the Publish as Web Page dialog box, shown in Figure 6-5.

the navigator's author must carefully document the new features; otherwise, it would be hard for a caller to exploit them through the generic XPathNavigator interface. In the following sections, we'll review the characteristics of the various XPath-enabled document classes. The XPathDocument Class The XPathDocument class provides a highly optimized, read-only in-memory cache for XML documents. Specifically designed to serve as an XPath data container, the class does not provide any information or identity for nodes. XPathDocument simply creates an underlying web of node references to let the navigator operate quickly and effectively. XPathDocument does not respect any XML DOM specification and has only one method CreateNavigator. The internal architecture of the XPathDocument class looks like a linked list of node references. Nodes are managed through an internal class (XPathNode) that represents a small subset of the XmlNode class, which is the official XML DOM node class in the .NET Framework. You can access the XML nodes of the document only through the properties exposed by the navigator object. (See Table 6-3.) The following code shows how to create a new, XPathDocument -driven navigator object: XPathDocument doc = new XPathDocument(fileName); XPathNavigator nav = doc.CreateNavigator(); The returned navigator is positioned at the root of the document. The XPathDocument class supports only XML-based data sources, and you can initialize it from disk files, streams, text, and XML readers. Tip You can also initialize an XPath document using the output returned by the ExecuteXmlReader method of the SqlCommand ADO.NET class. The method builds and returns an XML reader using the result set of a SQL query, as shown here: SqlCommand cmd = new SqlCommand(query, conn); XmlTextReader reader = (XmlTextReader) cmd.ExecuteXmlReader(); XPathDocument doc = new XPathDocument(reader);

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The XmlDocument Class XmlDocument is the class that represents the .NET Framework implementation of the W3C-compliant XML DOM. This aspect of XmlDocument was covered in detail in 5. Unlike XPathDocument, the XmlDocument class provides read/write access to the nodes of the underlying XML document. In addition, each node can be individually accessed and sets of nodes can be selected through XPath queries run by the SelectSingleNode and SelectNodes methods, respectively. The XmlDocument class also enables you to create a navigator object. In this case, however, the navigator will work on a much more rich and complex web of node references. The following code shows how to get the navigator for the XmlDocument class: XmlDocument doc = new XmlDocument(); doc.Load(fileName); XPathNavigator nav = doc.CreateNavigator(); 230

Figure 6-5. Use the Publish as Web Page dialog box settings to set options, including automatic republishing.

In particular, XmlDocument's navigator class extends the interface of the standard navigator by implementing the IHasXmlNode interface. This interface defines just one method, GetNode, as shown here: public interface IHasXmlNode { XmlNode GetNode(); } Using this method, callers can access and query the currently selected node of the navigator. This feature is simply impossible to implement for navigators based on XPathDocument because it exploits the different internal layout of the XmlDocument class. By design, the XPathDocument class minimizes the memory footprint and does not provide node identity. If the GetNode method is an extension to the XPathNavigator base class, how can callers take advantage of it Here's a code snippet: XmlDocument doc = new XmlDocument(); doc.Load(fileName); XPathNavigator nav = doc.CreateNavigator(); XmlNode node = ((IHasXmlNode) nav).GetNode(); At this point, the caller program has gained full access to the node and can read and update it at will. Note When created, the XmlDocument navigator is not positioned on the root of the document. Instead, it is positioned on the node from which the CreateNavigator method was called.

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