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If you read the first code sample of the previous chapter, Listing 6-1, and laughed at our results, you no doubt have experienced the same issue that prevented us from getting the results we were after getting the actual value from a node is a bit of a nuisance. We find that if we haven t been working with XML DOM code for a while, we inevitably end up with an error like the one in Listing 6-1. We always forget we have to take the extra step to get the value of the node. The LINQ to XML API fixes that problem very nicely. First, calling the ToString method of an element outputs the XML string itself, not the object type as it does with the W3C DOM API. This is very handy when you want an XML fragment from a certain point in the tree and makes far more sense than outputting the object type. Listing 7-7 shows an example.

This example is different than the previous in that there is now a comment and processing instruction added to the first BookParticipant element Pressing Ctrl+F5 displays the following: <!--This is a new author--> < AuthorHandler new > <FirstName>Joe</FirstName> <LastName>Rattz</LastName> We can now see the comment and the processing instruction What if you only want a certain type of node, though, such as just the elements Do you recall from 4 the OfType operator I can use that operator to return only the nodes that are of a specific type, such as XElement Using the same basic code as Listing 7-47, to return just the elements, I will merely change the foreach line, as shown in Listing 7-48 Listing 7-48 Using the OfType Operator to Return Just the Elements XElement firstParticipant; // A full document with all the bells and whistles XDocument xDocument = new XDocument( new XDeclaration("1.

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XElement name = new XElement("Name", "Joe"); Console.WriteLine(name.ToString()); Pressing Ctrl+F5 gives us the following: <Name>Joe</Name> Wow, that s a nice change. But wait, it gets better. Of course, child nodes are included in the output, and since the WriteLine method doesn t have an explicit overload accepting an XElement, it calls the ToString method for you, as shown in Listing 7-8.

Listin g 7-8. Console.WriteLine Implicitly Calling the ToString Method on an Element to Produce an XML Tree

0", "UTF-8", "yes"), new XDocumentType("BookParticipants", null, "BookParticipantsdtd", null), new XProcessingInstruction("BookCataloger", "out-of-print"), // Notice on the next line that I am saving off a reference to the first // BookParticipant element new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XComment("This is a new author"), new XProcessingInstruction("AuthorHandler", "new"), new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); foreach (XNode node in firstParticipantNodes()OfType<XElement>()) { ConsoleWriteLine(node); } As you can see, the XComment and XProcessingInstruction objects are still being created.

Many frameworks have the same underlying ideas but solve a problem a little differently and in different layers of a multitier application (the view layer, the controller layer, and the model layer). Examples of frameworks are Struts (an open source controller framework); TopLink and Hibernate (model frameworks); and Tiles, Tapestry, XUL, and ADF UIX (socalled view frameworks). The benefits of application frameworks are the modularity, reusability, and inversion of control (IoC) they provide to developers. By encapsulating implementation details, frameworks enhance modularity and improve software quality by centralizing the impact of design and implementation details. Thanks to the stable environment provided by frameworks, they also enhance reusability by allowing developers to create generic components that can be reused in new applications. This reuse of framework components improves application developer productivity and the quality of application software. By leveraging IoC, the framework manages which application-specific methods are called in response to user events.

XElement name = new XElement("Person", new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")); Console.WriteLine(name); And the following is the output: <Person> <FirstName>Joe</FirstName> <LastName>Rattz</LastName>

But since I am now calling the OfType operator, the code produces these results: <FirstName>Joe</FirstName> <LastName>Rattz</LastName> Are you starting to see how cleverly all the new C# language features and LINQ are coming together Isn t it cool that we can use that Standard Query Operator to restrict the sequence of XML nodes this way So if you want to get just the comments from the first BookParticipant element, could you use the OfType operator to do so Of course you could, and the code would look like Listing 7-49..

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