Windows phone 7 需要Windows Phone 7上的小帮助吗

我正在创建一个应用。。我面临一个小问题。我想得到这个东西。。。 我有一个单选按钮。现在，每当单击此单选按钮时，我想在循环中播放一段小音乐。我正在使用visual studio。。无法对其使用表达式。 我正在使用以下代码

public partial class Page3 : PhoneApplicationPage
    {

        private SoundEffect s1;


        public Page3()
        {
            InitializeComponent();
            GameTimer gameTimer = new GameTimer();
            gameTimer.UpdateInterval = TimeSpan.FromMilliseconds(10000);

            // Call FrameworkDispatcher.Update to update the XNA Framework internals.
            gameTimer.Update += delegate { try { FrameworkDispatcher.Update(); } catch { } };

            // Start the GameTimer running.
            gameTimer.Start();

            // Prime the pump or we'll get an exception.
            FrameworkDispatcher.Update();

            LoadSound("Views/1.wav", out s1);


        }

        private void LoadSound(String SoundFilePath, out SoundEffect Sound)
        {
            // For error checking, assume we'll fail to load the file.
            Sound = null;

            try
            {
                // Holds informations about a file stream.
                StreamResourceInfo SoundFileInfo = App.GetResourceStream(new Uri(SoundFilePath, UriKind.Relative));

                // Create the SoundEffect from the Stream
                Sound = SoundEffect.FromStream(SoundFileInfo.Stream);
            }
            catch (NullReferenceException)
            {
                // Display an error message
                MessageBox.Show("Couldn't load sound " + SoundFilePath);
            }
        }


        private void radioButton1_Checked(object sender, RoutedEventArgs e)
        {

                try
                {
                    s1.Play();
                }
                catch (NullReferenceException)
                {
                    MessageBox.Show("Can't play, s1 is null.");
                }
            }

---

这是我用来播放声音的代码，它可以工作：

private void PlaySound()
{
    Stream stream = TitleContainer.OpenStream("Media/Sounds/SomeFile.wav");
    SoundEffect effect = SoundEffect.FromStream(stream);
    FrameworkDispatcher.Update();
    effect.Play();
}

另外，确保您的声音文件被标记为内容