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Because the LINQ to XML API is so focused on elements, and that is what we are working with most, Microsoft provides a quick way to get just the elements of an element s child nodes using the Elements method. It is the equivalent of calling the OfType<XElement> method on the sequence returned by the Nodes method. Listing 7-51 is an example that is logically the same as Listing 7-48. Listing 7-51. Accessing an Element s Child Elements Using the Elements Method XElement firstParticipant; // A full document with all the bells and whistles. XDocument xDocument = new XDocument( new XDeclaration("1.0", "UTF-8", "yes"), new XDocumentType("BookParticipants", null, "BookParticipants.dtd", 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"))));

State management is one of the primary benefits of using JSF to build applications. JSF provides automatic state handling through a class called StateManager, which saves and restores state for a particular view (hierarchy of UIComponents) between requests on the server. Each UIComponent controls what internal state is saved, so you need to perform some work on your ProInputDate component to save its internal state.

No doubt that after seeing some of the LINQ examples and tips in this chapter, you may find yourself puzzled by some of the syntax shown. If so, don t worry because in the next chapter, we cover the enhancements Microsoft has made to C# that make all of this possible.

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foreach (XNode node in firstParticipant.Elements()) { Console.WriteLine(node); } This code produces the exact same results as Listing 7-48: <FirstName>Joe</FirstName> <LastName>Rattz</LastName> The Elements method also has an overloaded version that allows you to pass the name of the element you are looking for, as in Listing 7-52. Listing 7-52. Accessing Named Child Elements Using the Elements Method XElement firstParticipant; // A full document with all the bells and whistles. XDocument xDocument = new XDocument( new XDeclaration("1.0", "UTF-8", "yes"), new XDocumentType("BookParticipants", null, "BookParticipants.dtd", 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 firstParticipant.Elements("FirstName")) { Console.WriteLine(node); } This code produces the following:

XElement smoker = new XElement("Smoker", "true"); Console.WriteLine(smoker); Console.WriteLine((bool)smoker); Since we have specified the value of the element to be "true" and since the string "true" can be successfully converted to a bool, the code works: <Smoker>true</Smoker> True Unfortunately, exactly how the values get converted is not specified, but it appears that the conversion methods in the System.Xml.XmlConvert class are used for this purpose. Listing 7-12 demonstrates that this is the case when casting as a bool.

Down with XContainer.Element()

try { XElement smoker = new XElement("Smoker", "Tue"); Console.WriteLine(smoker); Console.WriteLine((bool)smoker); } catch (Exception ex) { Console.WriteLine(ex); } Notice that we intentionally misspell "True" in the previous code to force an exception in the conversion hoping for a clue to be revealed in the exception that is thrown. Will we be so lucky Let s press Ctrl+F5 to find out. <Smoker>Tue</Smoker> System.FormatException: The string 'tue' is not a valid Boolean value. at System.Xml.XmlConvert.ToBoolean(String s) ...

s Note By default state saving for a UIComponent is turned on, but an application developer can opt out of this by setting a flag transient to true. When a component is marked transient, it will not be present in the component hierarchy during the next postback request.

With the new LINQ to XML API comes a new object model containing many new classes that exist in the System.Xml.Linq namespace. One is the static class where the LINQ to XML extension methods live, Extensions; two are comparer classes, XNodeDocumentOrderComparer and XNodeEqualityComparer, and the remaining are used to build your XML trees. Those remaining classes are displayed in Figure 7-1.

You may obtain the first child element matching a specified name using the Element method. Instead of a sequence being returned requiring a foreach loop, I will have a single element returned, as shown in Listing 7-53.

There are some interesting things to note: * Of those remaining classes, three are abstract XObject, XContainer, and XNode so you will never construct them. An attribute, XAttribute, is not derived from a node, XNode. In fact, it is not a node at all but instead is a totally different type of class that is basically a name-value pair. Streaming elements, XStreamingElement, have no inheritance relationship with elements, XElement. The XDocument and XElement classes are the only classes that have child nodes derived from XNode.

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