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Listing 5-30. Calling the First SingleOrDefault Prototype Where an Element Is Not Found Employee emp = Employee.GetEmployeesArray() .Where(e => e.id == 5).SingleOrDefault(); Console.WriteLine(emp == null "NULL" : string.Format("{0} {1}", emp.firstName, emp.lastName)); I queried for the employee whose id is 5 since I know none exists, so an empty sequence will be returned. Unlike the Single operator, the SingleOrDefault operator handles empty sequences just fine. Here are the results:

Listin g 4-38. Code Converting an ArrayList to an IEnumerable<T> That Can Be Used with the Typical Standard Query Operators

ArrayList employees = Employee.GetEmployeesArrayList(); Console.WriteLine("The data type of employees is " + employees.GetType()); var seq = employees.Cast<Employee>(); Console.WriteLine("The data type of seq is " + seq.GetType()); var emps = seq.OrderBy(e => e.lastName); foreach (Employee emp in emps) Console.WriteLine("{0} {1}", emp.firstName, emp.lastName); First we call the GetEmployeesArrayList method to return an ArrayList of Employee objects, and then we display the data type of the employees variable. Next we convert that ArrayList to an IEnumerable<T> sequence by calling the Cast operator, and then we display the data type of the returned sequence. Lastly, we enumerate through that returned sequence to prove that the ordering did indeed work. Here is the output from the code: The data type of employees is System.Collections.ArrayList The data type of seq is System.Linq.Enumerable+<CastIterator>d__b0`1[LINQ4.Employee] Kevin Flynn William Gates Anders Hejlsberg David Lightman Joe Rattz

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Listing 5-31 is the same example where a single element is found. I use the Where operator to provide a sequence with just one element. Listing 5-31. Calling the First SingleOrDefault Prototype Where an Element Is Found Employee emp = Employee.GetEmployeesArray() .Where(e => e.id == 4).SingleOrDefault(); Console.WriteLine(emp == null "NULL" : string.Format("{0} {1}", emp.firstName, emp.lastName)); This time I specify an id I know exists. Here are the results for the code when an element is found:

achieved by using a ServletResponse wrapper. In addition, the component hierarchy is no longer created inline during rendering. Instead, during the Render Response phase of JSF 1.2, the component hierarchy is created first and rendered next. Therefore, during rendering, the full component hierarchy is available, so the state is written directly into the buffered response, rather than needing to use a placeholder token to be replaced by the real state in </f:view>.

You can see the data type of the employees variable is an ArrayList. It is a little more difficult determining what the data type of seq is. We can definitely see it is different, and it looks like a sequence. We can also see the word CastIterator in its type. Have you noticed that when we discuss the deferred operators that they don t actually return the output sequence but really return an object that, when enumerated, would yield the elements to the output sequence The seq variable s data type displayed in the previous example is just this kind of object. However, this is an implementation detail and could change.

David Lightman As you can see, the employee has been found. For the second SingleOrDefault prototype, shown in Listing 5-32, I specify an id that I know exists. Instead of using the Where operator, I embed the filter into the SingleOrDefault operator call. Listing 5-32. Calling the Second SingleOrDefault Prototype Where an Element Is Found Employee emp = Employee.GetEmployeesArray() .SingleOrDefault(e => e.id == 4); Console.WriteLine(emp == null "NULL" : string.Format("{0} {1}", emp.firstName, emp.lastName)); This example is functionally equivalent to the previous example except instead of filtering the elements using the Where operator, I filter them by passing a predicate to the SingleOrDefault operator. Here are the results:

C a utio n The Cast operator will attempt to cast each element in the input sequence to the specified type. If any of those elements cannot be cast to the specified type, an InvalidCastException exception will be thrown. If it is at all possible that there may be elements of differing types, use the OfType operator instead.

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