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public Person(){} public Person(string firstName, string lastName, int age) { Age = age; FirstName = firstName; LastName = lastName; } public override string ToString() { return string.Format("Name: {0} {1}, Age: {2}", FirstName, LastName, Age); } } To build a person only collection, you could define a System.Collections.ArrayList member variable within a class named PersonCollection and configure all members to operate on strongly typed Person objects, rather than on System.Object types. Here is a simple example (a production-level custom collection could support many additional members and might extend an abstract base class from the System.Collections namespace): public class PersonCollection : IEnumerable { private ArrayList arPeople = new ArrayList(); // Cast for caller. public Person GetPerson(int pos) { return (Person)arPeople[pos]; } // Only insert Person objects. public void AddPerson(Person p) { arPeople.Add(p); } public void ClearPeople() { arPeople.Clear(); } public int Count { get { return arPeople.Count; } } // Foreach enumeration support. IEnumerator IEnumerable.GetEnumerator() { return arPeople.GetEnumerator(); } } Notice that the PersonCollection class implements the IEnumerable interface, which allows a foreach-like iteration over each contained item. Also notice that your GetPerson() and AddPerson() methods have been prototyped to operate only on Person objects, not bitmaps, strings, database connections, or other items. With these types defined, you are now assured of type safety, given that the C# compiler will be able to determine any attempt to insert an incompatible data type:

Typically, you ll perform an action in response to an event from an Atlas control. All controls include a propertyChanged event that fires when any property value is modified. Most controls also provide a click event, and the Select control adds a selectionChanged event. (Oddly enough, the TextBox control doesn t provide a textChanged event, but you can respond to the propertyChanged event instead or use the behaviors described in the Behaviors section.)

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MXML is an XML-based user interface markup language. MXML is translated to an AS3 class that is 100percent compatible. It is the correct format to instantiate MXML classes via a new constructor. For example, you use the <mx:Button> tag to create an instance of the Button control using the following MXML statement: <mx:Button id="myButton" label="I'm a button!"/> That is exactly the same for the following AS code: var myButton : Button = new Button(); myButton.label = "I'm a button!" I prefer to use MXML just for the Views of the application because it is more readable for the designers and is easier to use with the layout managers and style sheets. However, excessive use of MXML can cause code-decoupling and make code difficult to read and implement.

static void UsePersonCollection() { Console.WriteLine("***** Custom Person Collection *****\n"); PersonCollection myPeople = new PersonCollection(); myPeople.AddPerson(new Person("Homer", "Simpson", 40)); myPeople.AddPerson(new Person("Marge", "Simpson", 38)); myPeople.AddPerson(new Person("Lisa", "Simpson", 9)); myPeople.AddPerson(new Person("Bart", "Simpson", 7)); myPeople.AddPerson(new Person("Maggie", "Simpson", 2)); // This would be a compile-time error! // myPeople.AddPerson(new Car()); foreach (Person p in myPeople) Console.WriteLine(p); } While custom collections do ensure type safety, this approach leaves you in a position where you must create an (almost identical) custom collection for each unique data type you wish to contain. Thus, if you need a custom collection that can operate only on classes deriving from the Car base class, you need to build a highly similar collection class: public class CarCollection : IEnumerable { private ArrayList arCars = new ArrayList(); // Cast for caller. public Car GetCar(int pos) { return (Car) arCars[pos]; } // Only insert Car objects. public void AddCar(Car c) { arCars.Add(c); } public void ClearCars() { arCars.Clear(); } public int Count { get { return arCars.Count; } } // Foreach enumeration support. IEnumerator IEnumerable.GetEnumerator() { return arCars.GetEnumerator(); } } However, a custom collection class does nothing to solve the issue of boxing/unboxing penalties. Even if you were to create a custom collection named IntCollection that you designed to operate only on System.Int32 items, you would have to allocate some type of object to hold the data (e.g., System.Array and ArrayList):

To see how an action works, you can take the Atlasified page shown in Figure 35-8 and add a click event to the button. To define an event, you simply add a nested element with the event name, as shown here: <button id="cmdOK"> <click> </click> </button>

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