入门Windows Phone中的媒体播放器状态7

Question

我已经修改了我的代码App.xaml.cs

但我有在“this.ApplicationLifetimeObjects.Add（新XNAAsyncDispatcher（TimeSpan.FromMilliseconds错误（50 ）））;”（放置在我的App.xaml.cs的端）

该错误是

• “System.TimeSpan.FromMilliseconds（双）是一种方法，但使用像类型”
• 系统。 Windows.Application.ApplicationLifetimeObjects是一个属性，但使用像类型
• 标识符预期
• 令牌无效“（”在一个类，结构或接口成员声明
• 方法必须有一个重转式

下面是整片我App.xaml.cs

namespace Alarm_Clock 

{ 

public class GlobalData 

{ 
    public BitmapImage bitmapImage; 
} 

public partial class App : Application 
{ 
    public static GlobalData globalData; 

    public class XNAAsyncDispatcher : IApplicationService 
{ 
    private readonly DispatcherTimer _frameworkDispatcherTimer; 

    public XNAAsyncDispatcher(TimeSpan dispatchInterval) 
    { 
     _frameworkDispatcherTimer = new DispatcherTimer(); 
     _frameworkDispatcherTimer.Tick += frameworkDispatcherTimer_Tick; 
     _frameworkDispatcherTimer.Interval = dispatchInterval; 
    } 
    void IApplicationService.StartService(ApplicationServiceContext context) { _frameworkDispatcherTimer.Start(); } 
    void IApplicationService.StopService() { _frameworkDispatcherTimer.Stop(); } 
    void frameworkDispatcherTimer_Tick(object sender, EventArgs e) { FrameworkDispatcher.Update(); } 
} 

    public static string imagePath 
    { 
     //get { return "PhotoNote_{0:yyyy-MM-dd_hh-mm-ss-tt}.jpg"; } 
     get; 
     set; 
    } 

    /// <summary> 
    /// Provides easy access to the root frame of the Phone Application. 
    /// </summary> 
    /// <returns>The root frame of the Phone Application.</returns> 
    public PhoneApplicationFrame RootFrame { get; private set; } 

    //Global variables for the WriteableBitmap objects used throughout the application. 
    public static WriteableBitmap CapturedImage; 

    /// <summary> 
    /// Constructor for the Application object. 
    /// </summary> 
    public App() 
    { 
     globalData = new GlobalData(); 
     globalData.bitmapImage = new BitmapImage(); 

     // Global handler for uncaught exceptions. 
     UnhandledException += Application_UnhandledException; 

     // Show graphics profiling information while debugging. 
     if (System.Diagnostics.Debugger.IsAttached) 
     { 
      // Display the current frame rate counters. 
      Application.Current.Host.Settings.EnableFrameRateCounter = true; 

      // Show the areas of the app that are being redrawn in each frame. 
      //Application.Current.Host.Settings.EnableRedrawRegions = true; 

      // Enable non-production analysis visualization mode, 
      // which shows areas of a page that are being GPU accelerated with a colored overlay. 
      //Application.Current.Host.Settings.EnableCacheVisualization = true; 
     } 

     // 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 
    private 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 
    this.ApplicationLifetimeObjects.Add(new XNAAsyncDispatcher(TimeSpan.FromMilliseconds(50))); 
} 

}

暂停只是没有在下面我的代码工作。

这是我整个的代码：

namespace Alarm_Clock 
{ 

    public partial class AlarmRing : PhoneApplicationPage 
    { 
     int songSelectedIndex; 

     public AlarmRing() 
     { 
      InitializeComponent(); 
      SupportedOrientations = SupportedPageOrientation.Portrait; 
      //Get the DateTime.Now and place it into "timeTxtBlock" text block 
      timeTxtBlock.Text = DateTime.Now.ToShortTimeString(); 


      //Read from Isolated storage queSetting.txt for the number of question to answer by the user 
      //Read from Isolated storage music.txt for the selected music to play when the alarm ring 
      var isoFile = IsolatedStorageFile.GetUserStoreForApplication(); 

       IsolatedStorageFile myStore = IsolatedStorageFile.GetUserStoreForApplication(); 
       try 
       { 
        StreamReader readFile = new StreamReader(new IsolatedStorageFileStream("SettingFolder\\music.txt", FileMode.Open, myStore)); 

        songSelectedIndex = Convert.ToInt16(readFile.ReadLine()); 
        readFile.Close(); 
       } 
       catch (Exception) 
       { 
        //If the user did not select the music to be played when the alarm ring it will play the first music by default 
        songSelectedIndex = 0; 
       } 


      using (var ml = new MediaLibrary()) 
      { 
       //Play the music using media player from the song collection 
       FrameworkDispatcher.Update(); 
       MediaPlayer.MediaStateChanged += new EventHandler<EventArgs>(MediaPlayer_MediaStateChanged); 
       MediaPlayer.Play(ml.Songs[songSelectedIndex]); 
       MediaPlayer.IsRepeating = true; 
       MediaPlayer.IsMuted = false; 
       MediaPlayer.IsShuffled = false; 
       MediaPlayer.IsVisualizationEnabled = false; 

      } 

      //Load code 
      loadtime(); 
     } 

     static void MediaPlayer_MediaStateChanged(object sender, EventArgs e) 
     { 
      if (MediaPlayer.State == MediaState.Paused) 
      { 
       MediaPlayer.Resume(); 
      } 

     } 

     void loadtime() 
     { 
      ringingAlarm.Begin(); 

      //Get the DateTime.Now 
      String timeNow = DateTime.Now.ToShortTimeString(); 


      using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication()) 
      { 
       foreach (string labels in storage.GetFileNames("*")) 
       { 
        XElement _xml; 
        IsolatedStorageFileStream location = new IsolatedStorageFileStream(labels, System.IO.FileMode.Open, storage); 
        System.IO.StreamReader file = new System.IO.StreamReader(location); 
        _xml = XElement.Parse(file.ReadToEnd()); 
        if (_xml.Name.LocalName != null) 
        { 
         XAttribute time = _xml.Attribute("time"); 
         //Get the day of the week 
         String dayOfWeek = DateTime.Now.DayOfWeek.ToString("F"); 

         if (timeNow == time.Value.ToString()) 
         { 
          //"textBlock2" text block will display the label of the alarm 
          textBlock2.Text = labels; 
         } 
        } 
        file.Dispose(); 
        location.Dispose(); 
       } 

      } 

     } 

     string settingQues; 
     string settingQuesPassToGame; 
     string format; 
     string format1; 
     protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e) 
     { 
      base.OnNavigatedTo(e); 

      //Try get the value of number of question to be answered by the user that is pass over from setClockPage.xaml 
      if (NavigationContext.QueryString.TryGetValue("settingQues", out settingQues)) 
       settingQuesPassToGame = settingQues; 

      //Try get the format that is passed over 
      if (NavigationContext.QueryString.TryGetValue("format", out format)) 
       format1 = format; 
     } 

     //Display a pop up message box with instruction 
     //And navigate to "Start.xaml" 
     private void gameBtn_Click(object sender, RoutedEventArgs e) 
     { 
      MessageBox.Show("To dismiss alarm" + System.Environment.NewLine + "- Answer selected IQ question" + System.Environment.NewLine + "- With all correct answer"); 
      NavigationService.Navigate(new Uri("/Start.xaml?ringingAlarmTitle=" + textBlock2.Text + "&ringingAlarmTime=" + timeTxtBlock.Text + "&format1=" + format1, UriKind.Relative)); 
     } 

     protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e) 
     { 
      e.Cancel = true; 
     } 

     public Visibility visible { get; set; } 
    } 
}  

当我把MediaPlayer.MediaStateChanged += new EventHandler<EventArgs>(MediaPlayer_MediaStateChanged);在构造函数中存在错误。

错误是MediaPlayer.MediaStateChanged += new EventHandler<EventArgs>(MediaPlayer_MediaStateChanged) is a method but is use like a type。

---

我已经改变了我的代码，但它仍然dosent工作

static void MediaPlayer_MediaStateChanged(object sender, EventArgs e) 
{ 

if (MediaPlayer.State == MediaState.Paused) 
{ 
    MediaPlayer.Resume(); 
} 

} 

Answer 1

你必须派遣XNA活动手册中的Windows Phone 7个应用程序：

public class XNAAsyncDispatcher : IApplicationService 
{ 
    private readonly DispatcherTimer _frameworkDispatcherTimer; 

    public XNAAsyncDispatcher(TimeSpan dispatchInterval) 
    { 
     _frameworkDispatcherTimer = new DispatcherTimer(); 
     _frameworkDispatcherTimer.Tick += frameworkDispatcherTimer_Tick; 
     _frameworkDispatcherTimer.Interval = dispatchInterval; 
    } 

    void IApplicationService.StartService(ApplicationServiceContext context) { _frameworkDispatcherTimer.Start(); } 
    void IApplicationService.StopService() { _frameworkDispatcherTimer.Stop(); } 
    void frameworkDispatcherTimer_Tick(object sender, EventArgs e) { FrameworkDispatcher.Update(); } 
} 

一下添加到年底您的public App()

public App() 
{ 
    // Other stuff 

    // End 
    this.ApplicationLifetimeObjects.Add(new XNAAsyncDispatcher(TimeSpan.FromMilliseconds(50))); 
} 

完全指南：http://msdn.microsoft.com/library/ff842408.aspx