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The ReplaceAll method is useful for replacing an element s entire subtree of XML. You can pass a simple value, such as a new string or a numeric type; or because there is an overloaded method that accepts multiple objects via the params keyword, an entire subtree can be changed. The ReplaceAll method also replaces attributes. Listing 7-73 is some sample code. Listing 7-73. Using ReplaceAll to Change an Element s Subtree // I will use this to store a reference to one of the elements in the XML tree. XElement firstParticipant; XDocument xDocument = new XDocument( new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz"))));

After all that finagling to get the reference of the second BookParticipant element in the previous example, the example in Listing 7-66 is sure to be anticlimactic. We will just get a reference to the first BookParticipant element using the Element method and add the new BookParticipant element after it using the AddAfterSelf method.

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Both provide the user with a rich, intuitive user interface and are not forcing the user to navigate from page to page Unless you are a serious JavaScript or Ajax hacker, you should think twice before choosing Ajax to build a SPIF application In context, a SPIF application built on top of a pure Ajax solution definitely means more client-side code More client-side code means more work at the browser, which means that code-intensive SPIF applications will need powerful processors to give the user the responsiveness desired Although computers have become faster, the processor problem with JavaScript functionality in the past has not completely disappeared not to mention that maintaining all that JavaScript code is not a task for the faint of heart! If you combined the asynchronous communication channel provided by Ajax with a feature-rich, client-side component model, you would be golden.

Listin g 7-66. Adding a Node in a Specific Location of the Specified Node s Child Nodes with AddAfterSelf

Console.WriteLine(System.Environment.NewLine + "Before updating elements:"); Console.WriteLine(xDocument); firstParticipant.ReplaceAll( new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")); Console.WriteLine(System.Environment.NewLine + "After updating elements:"); Console.WriteLine(xDocument); Notice that when I replaced the content with the ReplaceAll method, I omitted specifying an attribute. As you would expect, the content is replaced: Before updating elements: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> After updating elements: <BookParticipants> <BookParticipant> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants> Notice that the BookParticipant type attribute is now gone. This is interesting in that attributes are not child nodes of an element. But the ReplaceAll method replaces them as well.

// A document with one book participant. XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); xDocument.Element("BookParticipants").Add( new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham"))); xDocument.Element("BookParticipants"). Element("BookParticipant").AddAfterSelf(

Don t let this simply named method fool you; it s a powerhouse. It has the ability to add, change, and remove elements. Furthermore, it performs these operations on the child elements of the element you call it on. Stated differently, you call the SetElementValue method on a parent element to affect its content, meaning its child elements. When calling the SetElementValue method, you pass it the name of the child element you want to set and the value you want to set it to. If a child element is found by that name, its value is updated, as long as the passed value is not null. If the passed value is null, that found child element will be removed. If an element by that name is not found, it will be added with the passed value. Wow, what a method! Also, the SetElementValue method will only affect the first child element it finds with the specified name. Any subsequent elements with the same name will not be affected, either by the value being changed to the one passed in or the element being removed, because that passed value is null. Listing 7-74 is an example demonstrating all uses: update, add, and delete.

new XElement("BookParticipant", new XAttribute("type", "Technical Reviewer"), new XElement("FirstName", "Fabio"), new XElement("LastName", "Ferracchiati"))); Console.WriteLine(xDocument); This example just seems trivial after the previous one: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant type="Technical Reviewer"> <FirstName>Fabio</FirstName> <LastName>Ferracchiati</LastName> </BookParticipant> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants>

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