一起学Windows Phone7开发(十.Windows Phone 7 CTP-April 向Beta版迁移)

Windows phone 7 从发布到现在一共出了三个版本的SDK，并且互不兼容。之前我写了第一版向第二版的迁移，现在来看一下第二版到Beta版的变化。

一．App.xaml和App.cs

1. App.xaml

这个文件看上去比原来清爽了很多，没有大段大段的代码，这也看来也和新的模拟器风格有关。但是这样就会出问题了，原来的一个属性项没有了，造成原来的页面加载错误。

a. 把PhoneTextPageTitle2Style改为PhoneTextNormalStyle或自已再增加一个这样的属性。

b. <Application.RootVisual>

<phoneNavigation:PhoneApplicationFrame x:Name="RootFrame" Source="/MainPage.xaml"/>

</Application.RootVisual>

这一项被取消。从而造成无法启动应用程序。这个设置程序RootFrame的项被放到了配置文件里。

2. App.xaml.cs

同样的这个文件也发生了改变。改动也是比较大的。需要增加和去除一些代码（这里的Appp 类的代码）：

public partial class App : Application

{

public PhoneApplicationFrame RootFrame { get; private set; }

// Constructor

public App()

{

// Global handler for uncaught exceptions.

// Note that exceptions thrown by ApplicationBarItem.Click will not get caught here.

UnhandledException += Application_UnhandledException;

// Standard Silverlight initialization

InitializeComponent();

// Phone-specific initialization

InitializePhoneApplication();

}

// Code to execute when the application is launching (eg, from Start)

// This code will not execute when the application is reactivated

private void Application_Launching(object sender, LaunchingEventArgs e)

{

}

// Code to execute when the application is activated (brought to foreground)

// This code will not execute when the application is first launched

private void Application_Activated(object sender, ActivatedEventArgs e)

{

}

// Code to execute when the application is deactivated (sent to background)

// This code will not execute when the application is closing

private void Application_Deactivated(object sender, DeactivatedEventArgs e)

{

}

// Code to execute when the application is closing (eg, user hit Back)

// This code will not execute when the application is deactivated

private void Application_Closing(object sender, ClosingEventArgs e)

{

}

// Code to execute if a navigation fails

void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)

{

if (System.Diagnostics.Debugger.IsAttached)

{

// A navigation has failed; break into the debugger

System.Diagnostics.Debugger.Break();

}

}

// Code to execute on Unhandled Exceptions

private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)

{

if (System.Diagnostics.Debugger.IsAttached)

{

// An unhandled exception has occurred; break into the debugger

System.Diagnostics.Debugger.Break();

}

}

#region Phone application initialization

// Avoid double-initialization

private bool phoneApplicationInitialized = false;

// Do not add any additional code to this method

private void InitializePhoneApplication()

{

if (phoneApplicationInitialized)

return;

// Create the frame but don't set it as RootVisual yet; this allows the splash

// screen to remain active until the application is ready to render.

RootFrame = new PhoneApplicationFrame();

RootFrame.Navigated += CompleteInitializePhoneApplication;

// Handle navigation failures

RootFrame.NavigationFailed += RootFrame_NavigationFailed;

// Ensure we don't initialize again

phoneApplicationInitialized = true;

}

// Do not add any additional code to this method

private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)

{

// Set the root visual to allow the application to render

if (RootVisual != RootFrame)

RootVisual = RootFrame;

// Remove this handler since it is no longer needed

RootFrame.Navigated -= CompleteInitializePhoneApplication;

}

#endregion

}

二．WMAppManifest.xml

这个文件也有一些小改动。但是这些改动会造成程序无法启动。

1. 增加项

<Capabilities>

<Capability Name="ID_CAP_NETWORKING" />

<Capability Name="ID_CAP_LOCATION" />

<Capability Name="ID_CAP_SENSORS" />

<Capability Name="ID_CAP_MICROPHONE" />

<Capability Name="ID_CAP_MEDIALIB" />

<Capability Name="ID_CAP_GAMERSERVICES" />

<Capability Name="ID_CAP_PHONEDIALER" />

<Capability Name="ID_CAP_PUSH_NOTIFICATION" />

<Capability Name="ID_CAP_WEBBROWSERCOMPONENT" />

</Capabilities>

2. 修改项

原来的：

<Tasks>

<DefaultTask Name ="_default" PlaceHolderString="Default task"/>

</Tasks>

修改后：

<Tasks>

<DefaultTask Name ="_default" NavigationPage="MainPage.xaml"/>

</Tasks>

三．工程文件

增加了一个宏：WINDOWS_PHONE

<DefineConstants>DEBUG;TRACE;SILVERLIGHT;WINDOWS_PHONE</DefineConstants>

四．API

很多API被去掉，改名或并且，有相关的文档可以查。最主要的是这个Microsoft.Phone.dll的改动也会造成无法编译或无法启动程序。原来的Microsoft.Phone.Navigatio.dll被改为了System.Windows.Navigation.dll;

修改这两项：

xmlns:navigation="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"

xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"

五．Application Bar

这个也发生了改变，去掉了x:Name项，增加了Text属性，这个属性必须加，否则运行时会报错。

六．其它：

这个Beta，变动比较大，所有API的改变都在它的文档里有说明。这里就不在赘述了。还有就是模拟器的变化，可以看到内嵌了Bing搜索，还带语音搜索功能。另外这个版本已经支持中文了！