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public static IEnumerable<T> AsEnumerable<T>( this IEnumerable<T> source); The preceding prototype declares that the AsEnumerable operator operates on an IEnumerable<T> named source and returns that same sequence typed as IEnumerable<T>. It serves no other purpose than changing the output sequence type at compile time. This may seem odd since it must be called on an IEnumerable<T>. You may ask, Why would you possibly need to convert a sequence of type IEnumerable<T> to a sequence of type IEnumerable<T> That would be a good question.

Listing 5-34. Calling the ElementAt Operator Employee emp = Employee.GetEmployeesArray() .ElementAt(3); Console.WriteLine("{0} {1}", emp.firstName, emp.lastName); I specified that I want the element whose index is 3, which is the fourth element. Here are the results of the query:

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This process will continue calling the processValidators() method recursively on each component in the component hierarchy During validation of each HtmlInputText component, type conversion will occur first on the component s submitted value (for example, a string to a strongly typed object) The new object is set as a local value on the component, and the submitted value is cleared The new strongly typed object is then validated If there are no errors, then the next step is to queue a ValueChangeEvent that will be delivered at the end of the Apply Request Values phase If a conversion or validation error occurs, a corresponding JSF message is attached to the FacesContext using the component clientId, and then the renderResponse() method is called to indicate that the lifecycle should skip directly to the Render Response phase after the Process Validations phase is complete.

ArrayList alEmployees = LINQDev.HR.Employee.GetEmployees(); LINQDev.Common.Contact[] contacts = alEmployees .Cast<LINQDev.HR.Employee>() .Select(e => new LINQDev.Common.Contact { Id = e.id, Name = string.Format("{0} {1}", e.firstName, e.lastName) }) .ToArray<LINQDev.Common.Contact>(); LINQDev.Common.Contact.PublishContacts(contacts); To convert the ArrayList of Employee objects to an array of Contact objects, we first cast the ArrayList of Employee objects to an IEnumerable<Employee> sequence using the Cast Standard Query Operator. This is necessary because the legacy ArrayList collection class was used. Syntactically speaking, objects of the System.Object class type are stored in an ArrayList, not objects of the Employee class type. So, we must cast them to Employee objects. Had the GetEmployees method returned a generic List collection, this would not have been necessary. However, that collection type was not available when this legacy code was written. Next, we call the Select operator on the returned sequence of Employee objects, and in the lambda expression, the code passed inside the call to the Select method, we instantiate and initialize a Contact object using the C# object initialization features to assign the values from the input Employee element into a newly constructed output Contact element. A lambda expression is a C# feature that allows a shorthand for specifying anonymous methods that we explain in 2. Lastly, we convert the sequence of newly constructed Contact objects to an array of Contact objects using the ToArray operator because that is what the PublishContacts method requires. Isn t that slick Here are the results:

The ElementAtOrDefault operator returns the element from the source sequence at the specified index.

Contact Id: Contact Id: Contact Id:

There is one prototype I cover. The ElementAtOrDefault Prototype public static T ElementAtOrDefault<T>( this IEnumerable<T> source, int index); If the sequence implements IList<T>, the IList interface is used to retrieve the indexed element directly. If the sequence does not implement IList<T>, the sequence will be enumerated until the indexed element is reached. If the index is less than zero or greater than or equal to the number of elements in the sequence, default(T) is returned. For reference and nullable types, the default value is null. This is the behavior that distinguishes it from the ElementAt operator.

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