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Many dislike properties because they promote bad programming practices. You need to get beyond those comments and think in terms of the credit card and the cashier. Properties have their time and place. Classes should, in general, not expose their state. To get around exposing state, create methods that implement the general intent of the purpose of the class. Inheritance is a fundamental part of C# and you will need to know how to use it. One way to implement inheritance is through the use of the abstract keyword. Overriding is when you keep the interface the same and change behavior. Overloading is when you derive a class and define an identifier that happens to be the same as some base class identifier. Your overloaded identifier may change behavior and usage. Conditional compilation statements can be effective when you want to include code in certain configurations. Partial classes are very useful when you want to separate functionality that serves a specific purpose. In this chapter s example, it meant having the ability to add test code without violating the rule of exposing state.

chapter. There are two key differences. First, in the form generator, you need to write the parsing, whereas XAML and WFML provide their own parsers that automate this low-level grunt work. The second difference is that the form generator uses a higher-level model that has elements map to logical survey elements. In the XAML and WFML standards, elements map directly to controls.

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Figure 8-6. Creating a new type of form for easy reuse In the preceding example, you create a form with three fields: label, textbox, and button. You can then manipulate these fields using external code. At the end of the example, you create a new instance of this form and then set the Text property of the textbox field. Events can be exposed on the interface of a form in much the same way that fields can. This takes a little more work because of some inherent restrictions. The idea is to create a new event, store this event in a field in the class, and finally, to make this event a subscriber to the filtered event. You can see this demonstrated in the next example, where you filter the MouseClick event to create a LeftMouseClick: open System.Windows.Forms // a form with addation LeftMouseClick event type LeftClickForm() as x = inherit Form() // create the new event let event = new Event<MouseEventArgs>() // wire the new event up so it fires when the left // mouse button is clicked do x.MouseClick |> Event.filter (fun e -> e.Button = MouseButtons.Left) |> Event.add (fun e -> event.Trigger e) // expose the event as property [<CLIEvent>] member x.LeftMouseClick = event.Publish

A significant example of markup-based user interface is XAML (Extensible Application Markup Language, pronounced Zamel ). XAML is an XML-based markup language for constructing .NET objects. It was designed as a way to declaratively define Windows Forms user interfaces, and for that reason, it s the new standard for the Windows Presentation Foundation (WPF) display technology. (WPF is found in Windows Vista, Microsoft s next version of Windows, and it s available as a free download for Windows XP). Using XAML, you can define your windows with tags and write the logic behind them using your favorite .NET language, giving you the ability to tweak either piece separately. The nicest part is that Visual Studio won t be the only tool capable of working with XAML. Instead, several professional graphics programs are in the works that allow design artists to design XAML interfaces. To start experimenting with XAML in .NET today, surf to http://msdn.microsoft.com/ winfx/technologies/presentation.

To apply what you ve learned in this chapter, you can do the following: 1. The code for HotelCurrencyTrader.ConvertTo() and HotelCurrencyTrader.ConvertFrom() contains a potentially big bug. Identify the bug and fix it. 2. In the examples, the exchange rate is assigned by the caller of the HotelCurrencyTrader and ActiveCurrencyTrader. Implement functionality such that the exchange rate can be retrieved dynamically. Hint: think of converting ExchangeRate into a property that references an abstract base class that can be used as a directory to look up an exchange rate pair. 3. The currency ExchangeRate property is a double. Implement ExchangeRate using the decimal type. 4. Write test code for ActiveCurrencyTrader and HotelCurrencyTrader.

WFML (Windows Forms Markup Language) provides a more straightforward model for using markup with Windows Forms applications. Essentially, WFML consists of two pieces: the WFML markup standard (which dictates how you can build templates) and the WFML parser (which reads templates and creates the corresponding control objects).

Note If you ve programmed with ASP.NET before, the idea of WFML will seem surprisingly familiar. Like

Forms you create in this component-based manner will undoubtedly be easier to use than forms you create with a more scripted approach; however, you still face pitfalls when you create libraries for other .NET languages. Please refer to 13 for more information about making F# libraries usable by other .NET languages.

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