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
}