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public static T Single<T>( this IEnumerable<T> source, Func<T, bool> predicate); This version of the Single operator returns the only element it finds for which the predicate returns true. If no elements cause the predicate to return true or multiple elements cause the predicate to return true, the Single operator throws an InvalidOperationException.

Listing 7-1. Using Functional Construction to Create an XML Schema XElement xBookParticipant = new XElement("BookParticipant", new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")); Console.WriteLine(xBookParticipant.ToString()); Notice that when I constructed the element named BookParticipant, I passed two XElement objects as its value, each of which becomes a child element. Also notice that when I constructed the FirstName and LastName elements, instead of specifying multiple child objects, as I did when constructing the BookParticipant element, I provided the element s text value. Here are the results of this code: <BookParticipant> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> Notice how much easier it is now to visualize the XML schema from the code. Also notice how much less verbose that code is than the first code sample of the previous chapter, Listing 6-1. The LINQ to XML API code necessary to replace the code in Listing 6-1 that actually creates the XML tree is significantly shorter, as shown in Listing 7-2. Listing 7-2. Creates the Same XML Tree as Listing 6-1 but with Far Less Code XElement xBookParticipants = 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"))); Console.WriteLine(xBookParticipants.ToString()); That is far less code to create and maintain. Also, the schema is fairly ascertainable just reading the code. Here is the output: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants>

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ArgumentNullException is thrown if any arguments are null. InvalidOperationException is thrown if the source sequence is empty or if the predicate never returns true or finds more than one element for which it returns true.

essentially checks to see whether this style resource has already been written to the client; if it has, there is no need to write it again. Code Sample 2-5. Writing Style Resources to Client /** * Writes a style sheet resource at-most-once within a single * RenderResponse phase. * * @param context the Faces context * @param resourcePath the style sheet resource path * * @throws IOException if an error occurs during rendering */ protected void writeStyleResource( FacesContext context, String resourcePath) throws IOException { Set styleResources = _getStyleResourcesAlreadyWritten(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 (styleResources.add(resourcePath)) { ViewHandler handler = context.getApplication().getViewHandler(); String resourceURL = handler.getResourceURL(context, resourcePath); ResponseWriter out = context.getResponseWriter(); out.startElement("style", null); out.writeAttribute("type", "text/css", null); out.writeText("@import url(" + resourceURL + ");", null); out.endElement("style"); } } The writeStyleResource() method first calls the _getStyleResourceAlreadyWritten() method, which returns a resource set, identified by a key, containing resources written to the client, if any. If the style resource is already present in the resource set, the styleResource.add() returns false, and no resource is written to the client. Although not used in this chapter, a similar method, the writeScriptResource() method (see Code Sample 2-6), makes the same write-once guarantee for script resources. Code Sample 2-6. Writing Script Resource to the Client /** * Writes a script library resource at-most-once within a single * RenderResponse phase. * * @param context the Faces context

There is one more additional benefit to the new API that is apparent in the example s results. Please notice that the output is formatted to look like a tree of XML. If I output the XML tree created in Listing 6-1, it actually looks like this:

Listing 5-28. Samp le Code Callin g the Fi rst Si ngle Prot otype Employee emp = Employee.GetEmployeesArray() .Where(e => e.id == 3).Single(); Console.WriteLine("{0} {1}", emp.firstName, emp.lastName);

In this example, instead of wanting the query to produce a sequence, we just want a reference to a particular employee. The Single operator is very useful for this as long as you can ensure there will be only a single element in the sequence passed to it. In this case, since we called the Where operator and specified a unique key, we are safe. Here are the results: Anders Hejlsberg Listing 5-29 is some sample code using the second prototype of the Single operator.

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