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Now I will try that with a predicate that will not find a match, as shown in Listing 5-33. Listing 5-33. Calling the Second LastOrDefault Prototype Where an Element Is Not Found Employee emp = Employee.GetEmployeesArray() .SingleOrDefault(e => e.id == 5); Console.WriteLine(emp == null "NULL" : string.Format("{0} {1}", emp.firstName, emp.lastName)); Since there is no element whose id is 5, no elements are found. Here are the results:

The OfType operator is used to build an output sequence containing only the elements that can be successfully cast to a specified type.

So far, the only thing the user has seen is the initial rendering of the first requested page. After receiving the page, the user enters a username and password and clicks the login button. A postback is performed, and you will now look at how JSF handles postback. Some parts are similar to what we have already been covering in the initial request, but there are obviously differences and additions, especially in the JSF request lifecycle. At postback, all six phases of the JSF request lifecycle get called (unless somewhere in the process the FacesContext.renderResponse() method is called causing the lifecycle to jump directly to the Render Response phase). This is different from the initial request where only the first and last phases are called. Restore View Phase The first part of a postback is the same as for the initial request; the Restore View phase executes and calls the restoreView() method on the ViewHandler to restore any state available from the previous request. Figure 1-17 shows restoring the saved state of the component hierarchy.

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public static IEnumerable<T> OfType<T>( this IEnumerable source); The first thing you should notice about the OfType operator is that, just like the Cast operator, its first argument, named source, is of type IEnumerable, not IEnumerable<T>. Most of the deferred Standard Query Operators first arguments are of type IEnumerable<T>. This is because the OfType operator is designed to be called on classes that implement the IEnumerable interface, as opposed to the IEnumerable<T> interface. In particular, we are talking about all the legacy collections prior to C# 2.0 and generics. So, you can call the OfType operator on a legacy collection as long as it implements IEnumerable, and an IEnumerable<T> output sequence will be created. Since most of the Standard Query Operators work on IEnumerable<T> type sequences only, you must call some method like this one, or perhaps the Cast operator, to get the legacy collection converted to a sequence the Standard Query Operators can be called on. This is important when trying to use the Standard Query Operators on legacy collections. The OfType operator will return an object that, when enumerated, will enumerate the source sequence, yielding only those elements whose type matches the type specified, T. The OfType operator differs from the Cast operator in that the Cast operator will attempt to cast every element of the input sequence to type T and yield it to the output sequence. If the cast fails, an exception is thrown. The OfType operator will attempt to yield the input element only if it can be cast to type T. Technically, the element must return true for element e is T for the element to be yielded to the output sequence.

While no elements were found in the sequence, the SingleOrDefault operator handled the situation gracefully instead of throwing an exception.

For the example in Listing 4-39, we are going to create an ArrayList containing objects of our two common classes, Employee and EmployeeOptionEntry. Once we have the ArrayList populated with objects of both classes, we will first call the Cast operator to show how it fails in this circumstance. We will follow that call with a call to the OfType operator showing its prowess in the same situation.

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