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<BookParticipants><BookParticipant type="Author"><FirstName>Joe</FirstName> Which would you rather read In the next chapter, when I get to the section on performing LINQ queries that produce XML output, you will see the necessity of functional construction.

Employee emp = Employee.GetEmployeesArray() .Single(e => e.id == 3); Console.WriteLine("{0} {1}", emp.firstName, emp.lastName); This code is functionally equivalent to the previous example. Instead of calling the Where operator to ensure a single element is in the sequence, we can provide the same sequence filtering operation in the Single operator. This should return the only element in the input sequence whose id is 3. Here are the results: Anders Hejlsberg Remember, if either prototype of the Single operator ends up with no element to return, an InvalidOperationException is thrown. To avoid this, use the SingleOrDefault operator.

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* @param resourcePath the script library resource path * * @throws IOException if an error occurs during rendering */ protected void writeScriptResource( FacesContext context, String resourcePath) throws IOException { Set scriptResources = _getScriptResourcesAlreadyWritten(context); // Set.add() returns true only if item was added to the set // and returns false if item was already present in the set if (scriptResources.add(resourcePath)) { ViewHandler handler = context.getApplication().getViewHandler(); String resourceURL = handler.getResourceURL(context, resourcePath); ResponseWriter out = context.getResponseWriter(); out.startElement("script", null); out.writeAttribute("type", "text/javascript", null); out.writeAttribute("src", resourceURL, null); out.endElement("script"); } } The _getStyleResourceAlreadyWritten() method implements the at-most-once semantics by adding a key _STYLE_RESOURCE_KEY with an associated Map to the request scope. This Map is populated by the writeStyleResource() method described in Code Sample 2-7. Code Sample 2-7. Implements At-Most-Once Semantics for Each Style Resource // Implements at-most-once semantics for each style resource on // the currently rendering page private Set _getStyleResourcesAlreadyWritten( FacesContext context) { ExternalContext external = context.getExternalContext(); Map requestScope = external.getRequestMap(); Set written = (Set)requestScope.get(_STYLE_RESOURCES_KEY); if (written == null) { written = new HashSet(); requestScope.put(_STYLE_RESOURCES_KEY, written); } return written; }

With the original W3C DOM API, you could not simply create an XML element, XmlElement; you must have an XML document, XmlDocument, from which to create it. If you try to instantiate an XmlElement like this XmlElement xmlBookParticipant = new XmlElement("BookParticipant"); you will be greeted with the following compiler error: 'System.Xml.XmlElement.XmlElement(string, string, string, System.Xml.XmlDocument)' is inaccessible due to its protection level With the W3C DOM API, you can only create an XmlElement by calling an XmlDocument object s CreateElement method like this: XmlDocument xmlDoc = new XmlDocument(); XmlElement xmlBookParticipant = xmlDoc.CreateElement("BookParticipant"); This code compiles just fine. But it is often inconvenient to be forced to create an XML document when you just want to create an XML element. The new LINQ-enabled XML API allows you to instantiate an element itself without creating an XML document: XElement xeBookParticipant = new XElement("BookParticipant"); XML elements are not the only XML type of node impacted by this W3C DOM restriction. Attributes, comments, CData sections, processing instructions, and entity references all must be created from an XML document. Thankfully, the LINQ to XML API has made it possible to directly instantiate each of these on the fly. Of course, nothing prevents you from creating an XML document with the new API. For example, you could create an XML document and add the BookParticipants element and one BookParticipant to it, as shown in Listing 7-3. Listing 7-3. Using the LINQ to XML API to Create an XML Document and Adding Some Structure to It XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); Console.WriteLine(xDocument.ToString());

The SingleOrDefault operator is similar to the Single operator except for how it behaves when an element is not found.

public static T SingleOrDefault<T>( this IEnumerable<T> source); This version of the prototype returns the only element found in the input sequence. If the sequence is empty, default(T) is returned. For reference and nullable types, the default value is null. If more than one element is found, an InvalidOperationException is thrown.

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