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While you can obtain the single parent element using a node s Parent property, you can get a sequence of the ancestor elements using the Ancestors method. This is different in that it recursively traverses up the XML tree instead of stopping one level up, and it only returns elements, as opposed to nodes. To make this demonstration more clear, I will add some child nodes to the first book participant s FirstName element. Also, instead of enumerating through the ancestors of the first BookParticipant element, I use the Element method to reach down two levels to the newly added NickName element. This provides more ancestors to provide greater clarity. The code is shown in Listing 7-54. Listing 7-54. Traversing Up from an XElement Object via the Ancestors 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."),

Have you ever worked with some sort of collection, iterated through it, and deleted an item, and this caused the iteration to break or misbehave We have seen this recently working with a major suite of ASPNET server controls The suite has a DataGrid server control, and we needed to remove selected records from it We iterated through the records from start to finish, deleting the ones we needed to, but in doing so, it messed up the pointers being used for the iteration The result was some records that should not have been deleted were, and some that should have been deleted were not We called the vendor for support, and its solution was to iterate through the records backward This resolved the problem.

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With LINQ to XML, you will most likely run into this problem when removing nodes from an XML tree, although it can occur at other times, so you want to keep this in your mind when you are coding Let s examine the example in Listing 7-13..

new XProcessingInstruction("AuthorHandler", "new"), new XAttribute("type", "Author"), new XElement("FirstName", new XText("Joe"), new XElement("NickName", "Joey")), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); foreach (XElement element in firstParticipant. Element("FirstName").Element("NickName").Ancestors()) { Console.WriteLine(element.Name); } Again, please notice I add some child nodes to the first book participant s FirstName element. This causes the first book participant s FirstName element to have contents that include an XText object equal to the string "Joe", and to have a child element, NickName. I retrieve the first book participant s FirstName element s NickName element for which to retrieve the ancestors. In addition, notice I used an XElement type variable instead of an XNode type for enumerating through the sequence returned from the Ancestors method. This is so I can access the Name property of the element. Instead of displaying the element s XML as I have done in past examples, I am only displaying the name of each element in the ancestor s sequence. I do this because it would be confusing to display each ancestor s XML, because each would include the previous and it would get very recursive, thereby obscuring the results. That all said, here they are: FirstName BookParticipant BookParticipants Just as expected, the code recursively traverses up the XML tree.

XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", 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")))); IEnumerable<XElement> elements = xDocument.Element("BookParticipants").Elements("BookParticipant"); foreach (XElement element in elements) { Console.WriteLine("Source element: {0} : value = {1}",

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