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In this chapter, I ll discuss the different kinds of types that you ll run into as a Microsoft .NET Framework developer. It is crucial that all developers be familiar with the different behaviors that these types exhibit. When I was first learning the .NET Framework, I didn t fully understand the difference between primitive, reference, and value types. This lack of clarity led me to unwittingly introduce subtle bugs and performance issues into my code. By explaining the differences between the types here, I m hoping to save you some of the headaches I experienced while getting up to speed.

// This code is easier to write and understand. Appointment[] appointments = GetAppointmentsForToday(); for (Int32 a = 0; a < appointments.Length; a++) { ... }

applications or who have other strong reasons to use web standards (such as portability across multiple platforms), the Web, with support for advanced standards such as HTML5, is also an option. Java ME remains an option when you want to target the very low-cost Series 40 devices, and Flash remains available on Symbian and MeeGo. NOTE: Throughout the book, we focus on mobile-device software development for Qt and HTML5, as considerable documentation is already available that describes Java ME and Flash. If you re looking for resources for either of those platforms, consider Beginning Java ME Platform or AdvancED Flash on Devices: Mobile Development with Flash Lite and Flash

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The following code also runs correctly if there are no appointments to iterate over . However, this code is slightly more difficult to write and understand:

Certain data types are so commonly used that many compilers allow code to manipulate them using simplified syntax. For example, you could allocate an integer using the following syntax:

// This code is harder to write and understand. Appointment[] appointments = GetAppointmentsForToday(); if (appointments != null) { for (Int32 a = 0, a < appointments.Length; a++) { // Do something with appointments[a] } }

If you design your methods to return arrays with zero elements instead of null, callers of your methods will have an easier time working with them . By the way, you should do the same for fields . If your type has a field that s a reference to an array, you should consider having the field refer to an array even if the array has no elements in it .

System.Int32 a = new System.Int32();

The extension method above can now be invoked using any expression that results in a type that implements the IEnumerable<T> interface:

public static void Main() { // Shows each Char on a separate line in the console "Grant".ShowItems(); // Shows each String on a separate line in the console new[] { "Jeff", "Kristin" }.ShowItems(); // Shows each Int32 value on a separate line in the console new List<Int32>() { 1, 2, 3 }.ShowItems(); }

But I m sure you d agree that declaring and initializing an integer using this syntax is rather cumbersome. Fortunately, many compilers (including C#) allow you to use syntax similar to the following instead:

(LINQ) technology . For a great example of a class that offers many extension methods, see the static System.Linq.Enumerable class and all its static extension methods in the Microsoft .NET Framework SDK documentation . Every extension method in this class extends either the IEnumerable or IEnumerable<T> interface .

Although you may not know it, many well regarded applications use Qt, an open crossplatform framework acquired by Nokia through its acquisition of Trolltech in 2008; Google Earth, KDE, Opera, and Skype all use Qt to ease porting between multiple platforms. Qt as a framework for portable computing devices is not new either, having been used in mobile computing, running Linux and Window Mobile devices for several years. As you learn in s 4, 5 and 6, Qt provides a broad set of abstractions above native hardware, including: Help with memory management in C++ through its use of smart pointers, owned objects, and shared data between objects with copyon-write. A lightweight meta-object framework implemented using the C preprocessor and C++ to permit run-time type detection and message dispatching. Not one, but two graphics frameworks, one based on widget hierarchies and the other on scene-based rendering and transformation of viewable items. Cross-platform wrappers for network, file system, and other operating system services.

You can define extension methods for delegate types, too . For an example of this, turn to page 278 in 11, Events . You can also add extension methods to enumerated types . I show an example of this in the Adding Methods to Enumerated Types section in 15, Enumerated Types and Bit Flags . And last but not least, I want to point out that the C# compiler allows you to create a delegate (see 17, Delegates, for more information) that refers to an extension method over an object:

int a = 0;

public static void Main () { // Create an Action delegate that refers to the static ShowItems extension method // and has the first argument initialized to reference the Jeff string. Action a = "Jeff".ShowItems; . . . // Invoke the delegate which calls ShowItems passing it a reference to the Jeff string. a(); }

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