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public class IntCollection : IEnumerable { private ArrayList arInts = new ArrayList(); // Unbox for caller. public int GetInt(int pos) { return (int)arInts[pos]; } // Boxing operation! public void AddInt(int i) { arInts.Add(i); } public void ClearInts() { arInts.Clear(); } public int Count { get { return arInts.Count; } } IEnumerator IEnumerable.GetEnumerator() { return arInts.GetEnumerator(); } } Regardless of which type you might choose to hold the integers, you cannot escape the boxing dilemma using non-generic containers. When you use generic collection classes, you rectify all of the previous issues, including boxing/unboxing penalties and a lack of type safety. Also, the need to build a custom (generic) collection class manually becomes quite rare. Rather than having to build unique classes that can contain people, cars, and integers, you can use a generic collection class and specify the type of type. Consider the following method, which uses a generic List<> class (in the System.Collections.Generic namespace) to contain various types of data in a strongly typed manner (don t fret the details of generic syntax at this time): static void UseGenericList() { Console.WriteLine("***** Fun with Generics *****\n"); // This List<> can only hold Person objects. List<Person> morePeople = new List<Person>(); morePeople.Add(new Person ("Frank", "Black", 50)); Console.WriteLine(morePeople[0]); // This List<> can only hold integers. List<int> moreInts = new List<int>(); moreInts.Add(10); moreInts.Add(2); int sum = moreInts[0] + moreInts[1]; // Compile-time error! Can't add Person object // to a list of ints! // moreInts.Add(new Person()); }

Note To use the click event of a button, you must make sure you re using an ordinary button, not the ASP.NET Button server control. That s because the Button server control always renders as a submit button, so clicking it always posts back the page. If you re using Atlas, this isn t the behavior you want instead, you d like to handle the event on the client.

The System.Windows.Forms.Control base class (which is the inheritance chain of the Form type) defines a property named Controls. This property wraps a custom collection nested in the Control class named ControlsCollection. This collection (as the name suggests) references each UI element maintained by the derived type. Like other containers, this type supports several methods for inserting, removing, and finding a given UI widget (see Table A-1). Table A-1. ControlCollection Members

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Inside the <click> section, you place the element that defines the action you want to use. The following action sets the property of another Atlas control the spanResult label: <button id="cmdOK"> <click> <setProperty target="spanResult" property="text" value="You clicked the button." /> </click> </button> The <setProperty> element takes several attributes. This example uses only the required ones: a target that identifies the control that will be affected by the action, the property of the control you want to change, and the value you want to supply for that property. Figure 35-9 shows the rather underwhelming result.

Add() AddRange() Clear() Count Remove() RemoveAt()

In previous sections I spoke about Java POJO lightweight frameworks programming, Flex, AS, and BlazeDS the bridge between Java and Flex. You should now have a rough idea of all the technologies that you will need to develop a new generation of RIAs. Before presenting the sample applications and talking about the languages themselves, I want to introduce the Unified Modeling Language (UML) for planning and architecting the applications. UML is a standardized, general-purpose modeling language that combines the best techniques from data modeling, such as work flows, and entity relationship diagrams using various graphical techniques. Most of the time, the decision to start a project without UML results from the mistaken belief that this will save time. But speaking from experience and a straw poll of project managers, the project will always take longer and go over budget without planning. It isn t just the development time but also testing, bug fixing, and ultimately deployment that is affected. UML helps you to visualize the entire application before you enter the development phase and it should always be used, even with just a single developer. With UML you are able to define all processes, for both OO design and application requirements. Using UML, you can design your approach before you get involved with the code, and if you are leading a team, you can easily organize the development dividing the application in different parts and producing deliverables and check points. This will help you run your teams more effectively and have a better handle on the overall project. You are easily able to pinpoint the parts of code that you can reuse, and create reusable libraries for future projects. And you can visualize all the software requirements and check that all the pieces of the puzzle are there.

Figure 35-9. Showing a client-side message More commonly, you can use the SetPropertyAction to disable and enable controls or to dynamically hide and show entire panels. For example, consider the revised version of this page

You use these members to insert a new Control-derived type (or array of types) in the collection. This member removes all entries in the collection. This member returns the number of items in the collection. You use these members to remove a control from the collection.

shown in Figure 35-10. It provides two links that, when clicked, collapse the panel with all the controls or pop it back into view.

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