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！
