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

一起学Windows Phone7开发（十.Windows Phone 7 CTP-April向Beta版迁移）2010-11-07 博客园小镇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。

<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
     }