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XElement xElement = new XElement("BookParticipants", elements.Select(e => new XElement(e.Name, new XElement(e.Element("Name").Name, e.Element("Name").Value), new XElement("Books", e.Elements("Book"))))); Console.WriteLine(xElement); In the previous code, in the first statement, I generate a sequence of BookParticipant elements, two to be precise. Notice that some of the BookParticipant elements have Book child elements, such as the BookParticipant with the Name child element whose value is "Joe Rattz", and some have no Book elements, such as the BookParticipant whose Name child element is "John Q. Public". In the second statement, I build an XML tree using the sequence of elements I obtained. In the XML tree, I create an element with the same name as the source sequence, which will be BookParticipant. I then make the participant s name a child element, and then I create a list of Books for each participant. Here is the output from this code: <BookParticipants> <BookParticipant> <Name>Joe Rattz</Name> <Books> <Book>Pro LINQ: Language Integrated Query in C# 2008</Book> </Books> </BookParticipant> <BookParticipant> <Name>John Q. Public</Name> <Books /> </BookParticipant> </BookParticipants> The XML is just as I would expect based on the code, but notice that the Books element for the second BookParticipant is empty. What if you didn t want an empty Books element if there were no Book elements You could use null to suppress the Books element as well, with the correct operator. In Listing 9-10, I make a slight change to the code that produces the XML. Listing 9-10. An Example That Prevents an Empty Element IEnumerable<XElement> elements = new XElement[] { new XElement("BookParticipant", new XElement("Name", "Joe Rattz"), new XElement("Book", "Pro LINQ: Language Integrated Query in C# 2008")), new XElement("BookParticipant", new XElement("Name", "John Q. Public"))}; XElement xElement = new XElement("BookParticipants", elements.Select(e => new XElement(e.Name, new XElement(e.Element("Name").Name, e.Element("Name").Value), e.Elements("Book").Any() new XElement("Books", e.Elements("Book")) : null))); Console.WriteLine(xElement);

The setProperties() method, as shown in Code Sample 2-39, transfers properties and attributes from this tag to the specified component, if the corresponding properties of this tag handler instance were explicitly set. Code Sample 2-39. The setProperties() Method /** * Transfers the property values from this tag to the component. * * @param component the target component */ protected void setProperties( UIComponent component) { super.setProperties(component); // Behavioral properties setValueBindingProperty(component, "converter", _converter); setBooleanProperty(component, "immediate", _immediate); setBooleanProperty(component, "required", _required); setValueBindingProperty(component, "validator", _validator); setStringProperty(component, "value", _value); setMethodBindingProperty(component, "valueChangeListener", _valueChangeListener, new Class[] { ValueChangeEvent.class }); // Renderer-specific attributes setStringProperty(component, "title", _title); } }

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always seems like such a hassle. Well, worry yourself no longer. One of our personal favorite features of the LINQ to XML API is the parse method. Both the XDocument and XElement classes have a static method named Parse for parsing XML strings. We think by now you probably feel comfortable accepting that if you can parse with the XDocument class, you can probably parse with the XElement class, and vice versa. And since the LINQ to XML API is all about the elements, baby, we are going to only give you an element example this time. In the Saving with XDocument.Save() section earlier in this chapter, we show the output of the Save method if the LoadOptions parameter is specified as DisableFormatting. The result is a single string of XML. For the example in Listing 7-40, we start with that XML string (after escaping the inner quotes), parse it into an element, and output the XML element to the screen.

The significant change in the previous code is in bold. Instead of just creating a Books element and specifying all the existing Book elements as its content, I use the Any Standard Query Operator combined with the ternary operator (if then : else) to create the Books element only if there are in fact any Book elements. If there are no Book elements, the ternary operator returns null, and the XElement constructor knows to just ignore null, thereby eliminating the creation of the Books element. This can be very handy. Here are the results after the modification: <BookParticipants> <BookParticipant> <Name>Joe Rattz</Name> <Books> <Book>Pro LINQ: Language Integrated Query in C# 2008</Book> </Books> </BookParticipant> <BookParticipant> <Name>John Q. Public</Name> </BookParticipant> </BookParticipants> As you can see, the second BookParticipant element no longer has an empty Books element, as it did in the previous example.

In the previous chapter, we introduced you to LINQ. We provided some examples to whet your appetite n and shared some premature tips. You may be perplexed, though, by some of the syntax. If so, it is probably because C# has been enhanced with new features that are specific to LINQ. These features were added in C# 3.0 and further supplemented in .NET 4.0. In this chapter, we introduce you to the powerful C# additions.

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