使用 XAML 和 C# 构建 Windows 8 Metro 应用程序

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"Metro Revealed Building Windows 8 apps with XAML and C#" 本书籍《Metro Revealed Building Windows 8 apps with XAML and C#》是关于使用 XAML 和 C# 构建 Windows 8 应用程序的指南。该书籍涵盖了 Metro 应用程序的开发、设计和实现的方方面面，旨在帮助开发者快速掌握 Windows 8 应用程序的开发技术。在本书籍中，作者 Adam Freeman 详细介绍了 Metro 应用程序的开发过程，从基本概念到高级主题，包括数据绑定、页面设计、应用栏、飞出菜单、导航、布局和瓦片设计、应用生命周期和合同等。同时，本书籍还提供了大量的代码示例和实践指导，帮助开发者快速上手 Metro 应用程序的开发。本书籍的主要内容包括： 1. 获取开始：介绍 Metro 应用程序的基本概念和开发环境，包括 Visual Studio 和 Windows 8 开发工具。 2. 数据、绑定和页面：详细介绍了 Metro 应用程序中的数据绑定和页面设计，包括数据模型、数据绑定、页面导航和数据验证等。 3. 应用栏、飞出菜单和导航：介绍了 Metro 应用程序中的应用栏、飞出菜单和导航设计，包括应用栏的创建和自定义、飞出菜单的设计和实现、导航的设计和优化等。 4. 布局和瓦片设计：介绍了 Metro 应用程序中的布局和瓦片设计，包括布局的基本概念、瓦片设计的原则和实现、布局的优化和调整等。 5. 应用生命周期和合同：详细介绍了 Metro 应用程序的生命周期和合同，包括应用程序的安装、激活、暂停、恢复和卸载等生命周期事件，以及应用程序之间的合同和交互机制。本书籍《Metro Revealed Building Windows 8 apps with XAML and C#》是 Metro 应用程序开发者的必备指南，为开发者提供了详细的指南和实践指导，帮助开发者快速掌握 Windows 8 应用程序的开发技术。

CHAPTER 1 ■ GETTING STARTED

XAML may strike you as verbose and hard to read at ﬁrst, but you will soon get used to it. I ﬁnd that it is a

lot easier to work with XAML than using just C# code, although I admit it took me quite some time with XAML

before I decided that was the case.

Running and Debugging a Metro App

Now that we have a very simple Metro app, it is time to focus on how to run and debug a Metro app. Visual Studio

provides three ways to run a Metro app: on the local machine, on the simulator, or on a remote machine.

e problem with the local machine is that development PCs are rarely conﬁgured the way that user devices

are. Unless you are targeting your app at people with similar spec platforms, then testing on the local machine

doesn’t give you a representative view of how your application can behave.

Testing on a remote machine is the best approach, but only if you have a range of machines with dierent

capabilities to test with, which is difﬁcult at this point, given that so few Windows 8 machines are available

(although I have a small Dell laptop that runs the Consumer Preview of Windows 8 quite happily and lets me

debug touchscreen issues).

Tip ■ You need to download and install the Remote Tools for Visual Studio 11 Beta from http://preview.win-

dows.com on each remote machine you want to test an app on.

e best compromise is the Visual Studio simulator, which provides faithful representation of the Metro

experience and lets you change the capabilities of the device you are simulating, including changing the screen

size, simulating touch events, and generating synthetic geolocation data. To select the simulator, locate the

button on the Visual Studio toolbar that currently says Local Machine, and click the small downward arrow just to

the right of it. Select Simulator from the pop-up menu, as shown in Figure 1-5.

Figure 1-5. Selecting the Visual Studio simulator to test Metro apps

Running a Metro App in the Simulator

To start the example app, click the toolbar button (which will now say Simulator), or select Start with Debug

from the Debug menu. Visual Studio will start the simulator and build and deploy the Metro app, as show in

Figure 1-6.

Chapter 2

Data, Binding, and Pages

In this chapter, I show you how to deﬁne and use the data that forms the core of a Metro application. To do this,

I will be loosely following the view model pattern, which allows me to cleanly separate the data from the parts of

the app that are responsible for displaying that data and handling user interactions.

You may already be familiar with view models from design patterns such as Model-View-Controller (MVC)

and Model-View-View Controller (MVVC). I am not going to get into the details of these patterns in this book.

ere is a lot of good information about MVC and MVVC available, starting with Wikipedia, which has some

balanced and insightful descriptions.

I ﬁnd the beneﬁts of using a view model to be enormous and well worth considering for all but the simplest

Metro projects, and I recommend you seriously consider following the same path. I am not a pattern zealot, and I

ﬁrmly believe in taking the parts of patterns and techniques that solve real problems and adapting them to work

in speciﬁc projects. To that end, you will ﬁnd that I take a pretty liberal view of how a view model should be used.

is chapter is focused on the behind-the-scenes plumbing in a Metro app, creating a foundation that I can

build to demonstrate dierent Metro features. I start slowly, deﬁning a simple view model, and demonstrate

dierent techniques for bringing the data from the view model into the application display using data binding.

I then show you how you can break down your application into multiple pages and bring those pages into

the main layout, changing which pages are used to reﬂect the state of your Metro app. Table 2-1 provides the

summary for this chapter.

Table 2-1. Chapter Summary

Problem Solution Listing

Create an observable class. Implement the InotifyPropertyChanged interface. 1

Create an observable collection. Use the ObservableCollection class. 2

Change the Page loaded when

a Metro app starts.

Change the type speciﬁed in the OnLaunched

method in App.xaml.cs.

Set the source for data binding values. Use the DataContext property. 4

Create reusable styles and templates. Create a resource dictionary. 5, 6

Bind UI controls to the view model. Use the Binding keyword. 7

Add another Page to the app layout. Add a Frame to the main layout and use the

Navigate method to specify the Page to display.

8, 10

Dynamically insert pages into the app layout. Use the Frame.Navigate method, optionally

passing a context object to the embedded Page.

CHAPTER 2 ■ DATA, BINDING, AND PAGES

Caution ■ You will need to uninstall the example Metro app from the previous chapter if you are following the

examples using the source code download from Apress.com. Right-click the MetroGrocer Start menu tile in the

simulator and select Uninstall. If you run an app that has already been installed from a different project path, Visual

Studio will report an error. You must uninstall as you move from one chapter to another.

Adding a View Model

At the heart of a good Metro app is a view model, the use of which lets me keep my application data separate

from the way it is presented to the user. View models are an essential foundation for creating apps that are easy to

enhance and maintain over time. It can be tempting to treat the data contained in a particular UI control as being

authoritative, but you will soon reach a point where ﬁguring out where your data is and how it should be updated

is unmanageable.

To begin, I have created a new folder in the Visual Studio project called Data and have created two new class

ﬁles. e ﬁrst deﬁnes the GroceryItem class, which represents a single item on the grocery list. You can see the

contents of GroceryItem.cs in Listing 2-1.

Listing 2-1. e GroceryItem Class

using System.ComponentModel;

namespace MetroGrocer.Data {

public class GroceryItem : INotifyPropertyChanged {

private string name, store;

private int quantity;

public string Name {

get { return name; }

set { name = value; NotifyPropertyChanged("Name"); }

}

public int Quantity {

get { return quantity; }

set { quantity = value; NotifyPropertyChanged("Quantity"); }

}

public string Store {

get { return store; }

set { store = value; NotifyPropertyChanged("Store"); }

}

public event PropertyChangedEventHandler PropertyChanged;

private void NotifyPropertyChanged(string propName) {

if (PropertyChanged != null) {

PropertyChanged(this, new PropertyChangedEventArgs(propName));

}

is class deﬁnes properties for the name and quantity of the item to be purchased and which store it should

be bought from. e only noteworthy aspect of this class is that it is observable. One of the nice features about

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