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XDocument xDocument = new XDocument( new XElement("BookParticipants", firstParticipant = 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")))); Console.WriteLine(xDocument); firstParticipant.Remove(); Console.WriteLine(System.Environment.NewLine + "After node deletion"); Console.WriteLine(xDocument); If all goes as planned, we should get the XML tree initially with the first book participant element and subsequently without it: Before node deletion <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants> After node deletion <BookParticipants> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants> As you can see, the first BookParticipant element is gone after the node deletion.

In the first example, I create a DataTable from an array of Student objects using my common GetDataTable method, and the array will have one duplicate in it. The record whose Id is equal to 1 is repeated in the array. I then display the DataTable. This proves that the record is in the DataTable twice. Then I remove any duplicate rows by calling the Distinct operator, and display the DataTable again, showing that the duplicate row has been removed. Listing 10-1 shows the code. Listing 10-1. The Distinct Operator with an Equality Comparer Student[] students new Student { Id new Student { Id new Student { Id new Student { Id new Student { Id new Student { Id new Student { Id = = = = = = = = { 1, Name = "Joe Rattz" }, 6, Name = "Ulyses Hutchens" }, 19, Name = "Bob Tanko" }, 45, Name = "Erin Doutensal" }, 1, Name = "Joe Rattz" }, 12, Name = "Bob Mapplethorpe" }, 17, Name = "Anthony Adams" },

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<h:outputText value=".NET" /> </f:facet> <h:panelGrid columns="1" > <h:outputText value="Pro .NET Extreme Programming" /> <h:outputText value=".NET for Delphi Programmers" /> </h:panelGrid> </pro:showItem> <pro:showListener type="com.apress.projsf.ch3.application.MyShowListener" /> </pro:showOneDeck> ... </f:view> </jsp:root> The tags highlighted in bold represent the JSF components you will learn how to create in this chapter. As you can see, the sample is a fairly simple application with one parent component <pro:showOneDeck ... > that keeps track of which item is currently open and which node is set to be expanded by default. In the page the parent component has three children <pro:showItem ... >. Each <pro:showItem ... > child component has its own unique identifier (for example, first, second, and third). Each <pro:showItem ... > has a facet <f:facet name="header"> associated with it representing the header of the clickable area of the item (see 1 for more about facets). Part of the deck component s requirements is to allow application developers to use any component to represent the actual clickable header, and as examples we have used regular <h:outputText> and <h:panelGroup> components. Nested within each <pro:showItem ... > is a set of children, which will be displayed when the user selects an item. When the user selects any of the <pro:showItem ... > components, an event will be delivered to the event queue for processing in the Invoke Application phase. To be able to react to this event, a new listener <pro:showListener ... /> listens for the aforementioned event.

IEnumerable<T>.Remove()

new Student { Id = 32, Name = "Dignan Stephens" } }; DataTable dt = GetDataTable(students); Console.WriteLine("{0}Before calling Distinct(){0}", System.Environment.NewLine); OutputDataTableHeader(dt, 15); foreach (DataRow dataRow in dt.Rows) { Console.WriteLine("{0,-15}{1,-15}", dataRow.Field<int>(0), dataRow.Field<string>(1)); } IEnumerable<DataRow> distinct = dt.AsEnumerable().Distinct(DataRowComparer.Default); Console.WriteLine("{0}After calling Distinct(){0}", System.Environment.NewLine); OutputDataTableHeader(dt, 15); foreach (DataRow dataRow in distinct) { Console.WriteLine("{0,-15}{1,-15}", dataRow.Field<int>(0), dataRow.Field<string>(1)); } Notice that I use the AsEnumerable operator to get a sequence of DataRow objects from the DataTable because that is what I must call the Distinct operator on. Also notice that in the students array, the record with an Id equal to 1 is repeated. You no doubt noticed that I call a method named Field on the DataRow object. For now, just understand that this is a helper method that makes obtaining a DataColumn object s value from a DataRow more convenient. I cover the Field<T> operator in depth later in the DataRow Field Operators section of this chapter. Here are the results: Before calling Distinct() Id Name ============================== 1 Joe Rattz 6 Ulyses Hutchens 19 Bob Tanko 45 Erin Doutensal 1 Joe Rattz 12 Bob Mapplethorpe 17 Anthony Adams 32 Dignan Stephens

In the previous case, we call the Remove method on a single XNode object. We can also call Remove on a sequence (IEnumerable<T>). Listing 7-68 is an example where we use the Descendants method of the document to recursively traverse all the way down the XML tree, returning only those elements whose name is FirstName by using the Where operator. We then call the Remove method on the resulting sequence.

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