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Since the first prototype is for removing attributes, I need a sequence of attributes. So I will build my standard XML tree and retrieve a sequence of the BookParticipant element s attributes. I will display each source attribute, then call the Remove operator on the sequence of source attributes. Then, just to prove it worked, I will display the entire XML document, and the attributes will be gone, as shown in Listing 8-19.

N ote For the previous code to work, you will need to have a using directive for the System.Collections.Generic namespace, in addition to the System.Linq namespace you should always expect to have when LINQ code is present.

Before creating your first custom JSF component, you need to understand the steps required to complete a JSF component. Table 2-2 outlines the blueprint needed to successfully implement a custom JSF component. During the course of this book, we ll expand this blueprint with additional steps, and these first steps will be the foundation for all custom components you ll create later. For now, you ll focus only on the steps needed to successfully implement the input date component.

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Listing 8-19. Calling the First Remove Prototype XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XComment("This is a new author."), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); IEnumerable<XAttribute> attributes = xDocument.Element("BookParticipants").Elements("BookParticipant").Attributes(); // First, I will display the source attributes. foreach (XAttribute attribute in attributes) { Console.WriteLine("Source attribute: {0} : value = {1}", attribute.Name, attribute.Value); } attributes.Remove(); // Now, I will display the XML document. Console.WriteLine(xDocument); Will it work Let s see: Source attribute: type : value = Author Source attribute: type : value = Editor <BookParticipants> <BookParticipant> <!--This is a new author.--> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants> So far, all is good. Now, I ll try the second prototype. For this example, instead of merely obtaining a sequence of nodes and removing them, I ll show something that might be a little more interesting. I ll get a sequence of the comments of some particular elements and remove just those, as shown in Listing 8-20.

This code would produce the following abbreviated results: 3/21/1997 12:00:00 AM - 10482 - Lazy K Kountry Store 5/22/1997 12:00:00 AM - 10545 - Lazy K Kountry Store 4/17/1998 12:00:00 AM - 11032 - White Clover Markets 5/1/1998 12:00:00 AM - 11066 - White Clover Markets

You will find that the majority of LINQ s Standard Query Operators can be called only on collections implementing the IEnumerable<T> interface. None of the legacy C# collections those in the System.Collections namespace implement IEnumerable<T>. So, the question becomes, how do you use LINQ with legacy collections There are two Standard Query Operators specifically for this purpose, Cast and OfType. Both of these operators can be used to convert legacy collections to IEnumerable<T> sequences. Listing 1-9 shows an example.

Listing 8-20. Calling the Second Remove Prototype XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XComment("This is a new author."), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); IEnumerable<XComment> comments = xDocument.Element("BookParticipants").Elements("BookParticipant"). Nodes().OfType<XComment>(); // First, I will display the source comments. foreach (XComment comment in comments) { Console.WriteLine("Source comment: {0}", comment); } comments.Remove(); // Now, I will display the XML document. Console.WriteLine(xDocument); In this example, when building my source sequence, I retrieve the child nodes of each BookParticipant element. I could just call the Remove operator on that sequence, and then all the child nodes of each BookParticipant element would be gone. But instead, to spice it up, I call the OfType Standard Query Operator. If you recall from Part 2 of this book on LINQ to Objects, this operator will return only the objects in the input sequence matching the type specified. By calling the OfType operator and specifying a type of XComment, I get a sequence of just the comments. Then, I call the Remove method on the comments. The results should be that the original document is missing the one comment that it initially had: Source comment: <!--This is a new author.--> <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants> That worked like a charm. Look how handy the OfType operator is and how I can integrate it into the LINQ to XML query. That seems like it could be very useful.

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