微软官方指南：Windows Phone程序开发权威书籍

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"《Windows Phone程序开发指南》是由Microsoft Press出版的一本权威著作，专为Windows Phone平台的开发者设计。这本书由微软公司的专家撰写，深入探讨了Windows Phone应用的开发技术，涵盖了从基础概念到高级实践的全方位内容。作为国外大牛的作品，它不仅提供了丰富的编程技巧，还展示了最新的Windows Phone生态系统特性。书中包含了详细的教学步骤和实用案例，帮助读者掌握C#语言在Windows Phone应用开发中的应用，包括XAML（XML-based language for user interface design）的设计和利用MVVM（Model-View-ViewModel）架构模式进行高效开发。此外，读者还将了解到如何利用PhoneGap等工具进行跨平台开发，以及如何优化应用程序性能和用户体验。版权方面，该书受到Microsoft Corporation严格的版权保护，未经许可，任何复制或传播行为都必须获得书面授权。图书已在全球范围内通过书店和分销商发行，对于国际版的需求，读者可以通过联系微软公司或直接与Microsoft Press International联系获取更多信息。本书的特色还包括了对微软商标和第三方知识产权的尊重，其中列举了示例公司、产品和服务的名称，旨在提供一个真实世界的应用场景，但所有提及的具体名称均为虚构，以免侵犯实际品牌权益。《Windows Phone程序开发指南》是一本必备的参考书籍，无论是初学者还是专业开发者，都能从中受益匪浅，提升在Windows Phone平台上构建高质量应用的能力。如果你对本书有任何反馈，可以通过微软官网的学习书籍调查链接参与评价，共同推动技术进步。"

Charles Petzold

New York City and Roscoe, New York

October 22, 2010

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you do find an error, e-mail Microsoft Press Book Support at mspinput@microsoft.com.

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Chapter 1

Hello, Windows Phone 7

Sometimes it becomes apparent that previous approaches to a problem haven’t quite worked

the way you anticipated. Perhaps you just need to clear away the smoky residue of the past,

take a deep breath, and try again with a new attitude and fresh ideas. In golf, it’s known as a

“mulligan”; in schoolyard sports, it’s called a “do-over”; and in the computer industry, we say

it’s a “reboot.”

A reboot is what Microsoft has initiated with its new approach to the mobile phone market.

With its clean look, striking fonts, and new organizational paradigms, Microsoft Windows

Phone 7 not only represents a break with the Windows Mobile past but also differentiates

itself from other smartphones currently in the market. Windows Phone 7 devices will be made

by several manufacturers and available with a variety of cell providers.

For programmers, Windows Phone 7 is also exciting, for it supports two popular and modern

programming platforms: Silverlight and XNA.

Silverlight—a spinoff of the client-based Windows Presentation Foundation (WPF)—has

already given Web programmers unprecedented power to develop sophisticated user

interfaces with a mix of traditional controls, high-quality text, vector graphics, media,

animation, and data binding that run on multiple platforms and browsers. Windows Phone 7

extends Silverlight to mobile devices.

XNA—the three letters stand for something like “XNA is Not an Acronym”—is Microsoft’s

game platform supporting both 2D sprite-based and 3D graphics with a traditional game-

loop architecture. Although XNA is mostly associated with writing games for the Xbox 360

console, developers can also use XNA to target the PC itself, as well as Microsoft’s classy audio

player, the Zune HD.

Either Silverlight or XNA would make good sense as the sole application platform for the

Windows Phone 7, but programmers have a choice. And this we call “an embarrassment of

riches.”

Targeting Windows Phone 7

All programs for Windows Phone 7 are written in .NET managed code. Although the sample

programs in this book are written in the C# programming language, it is also possible to write

Windows Phone 7 applications in Visual Basic .NET. The free downloadable Microsoft Visual

Studio 2010 Express for Windows Phone includes XNA Game Studio 4.0 and an on-screen

phone emulator, and also integrates with Visual Studio 2010. You can develop visuals and

animations for Silverlight applications using Microsoft Expression Blend.

The Silverlight and XNA platforms for Windows Phone 7 share some libraries, and you can use

some XNA libraries in a Silverlight program and vice versa. But you can’t create a program

that mixes visuals from both platforms. Maybe that will be possible in the future, but not now.

Before you create a Visual Studio project, you must decide whether your million-dollar idea is

a Silverlight program or an XNA program.

Generally you’ll choose Silverlight for writing programs you might classify as applications or

utilities. These programs are built from a combination of markup and code. The markup is the

Extensible Application Markup Language, or XAML and pronounced “zammel.” The XAML

mostly defines a layout of user-interface controls and panels. Code-behind files can also

perform some initialization and logic, but are generally relegated to handling events from the

controls. Silverlight is great for bringing to the Windows Phone the style of Rich Internet

Applications (RIA), including media and the Web. Silverlight for Windows Phone is a version of

Silverlight 3 excluding some features not appropriate for the phone, but compensating with

some enhancements.

XNA is primarily for writing high-performance games. For 2D games, you define sprites and

backgrounds based around bitmaps; for 3D games you define models in 3D space. The action

of the game, which includes moving graphical objects around the screen and polling for user

input, is synchronized by the built-in XNA game loop.

The differentiation between Silverlight-based applications and XNA-based games is

convenient but not restrictive. You can certainly use Silverlight for writing games and you can

even write traditional applications using XNA, although doing so might sometimes be

challenging.

In particular, Silverlight might be ideal for games that are less graphically oriented, or use

vector graphics rather than bitmap graphics, or are paced by user-time rather than clock-

time. A Tetris-type program might work quite well in Silverlight. You’ll probably find XNA to

be a bit harder to stretch into Silverlight territory, however. Implementing a list box in XNA

might be considered “fun” by some programmers but a torture by many others.

The first several chapters in this book describe Silverlight and XNA together, and then the

book splits into different parts for the two platforms. I suspect that some developers will stick

with either Silverlight or XNA exclusively and won’t even bother learning the other

environment. I hope that’s not a common attitude. The good news is that Silverlight and XNA

are so dissimilar that you can probably bounce back and forth between them without

confusion!

Microsoft has been positioning Silverlight as the front end or “face” of the cloud, so cloud

services and Windows Azure form an important part of Windows Phone 7 development. The

Windows Phone is “cloud-ready.” Programs are location-aware and have access to maps and

other data through Bing and Windows Live. One of the available cloud services is Xbox Live,

which allows XNA-based programs to participate in online multiplayer games, and can also be

accessed by Silverlight applications.

Programs you write for the Windows Phone 7 will be sold and deployed through the

Windows Phone Marketplace, which provides registration services and certifies that programs

meet minimum standards of reliability, efficiency, and good behavior.

I’ve characterized Windows Phone 7 as representing a severe break with the past. If you

compare it with past versions of Windows Mobile, that is certainly true. But the support of

Silverlight, XNA, and C# are not breaks with the past, but a balance of continuity and

innovation. As young as they are, Silverlight and XNA have already proven themselves as

powerful and popular platforms. Many skilled programmers are already working with either

one framework or the other—probably not so many with both just yet—and they have

expressed their enthusiasm with a wealth of online information and communities. C# has

become the favorite language of many programmers (myself included), and developers can

use C# to share libraries between their Silverlight and XNA programs as well as programs for

other .NET environments.

The Hardware Chassis

Developers with experience targeting Windows Mobile devices of the past will find significant

changes in Microsoft’s strategy for the Windows Phone 7. Microsoft has been extremely

proactive in defining the hardware specification, often referred to as a “chassis.”

Initial releases of Windows Phone 7 devices will have one consistent screen size. (A second

screen size is expected in the future.) Many other hardware features are guaranteed to exist

on each device.

The front of the phone consists of a multi-touch display and three hardware buttons generally

positioned in a row below the display. From left to right, these buttons are called Back, Start,

and Search:

• Back Programs can use this button for their own navigation needs, much like the Back

button on a Web browser. From the home page of a program, the button causes the

program to terminate.

• Start This button takes the user to the start screen of the phone; it is otherwise

inaccessible to programs running on the phone.

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