MediaPlayer doesn't play after computer sleeps

Question

The following code plays a short sound (a simple wav file) every time a button is clicked.

But after putting the computer to sleep and waking it up again - it doesn't play the sound anymore when the button is clicked (though the event handler Button_Click is being called). Why?

The code:

public partial class MainWindow : Window
{
    MediaPlayer player1;

    public MainWindow()
    {
        InitializeComponent();
        player1 = new MediaPlayer();
        player1.Open(new Uri("Some\Path\sound.wav"));
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        player1.Position = TimeSpan.Zero;
        player1.Play();
    }
}

I know I can Open the file again when the user logs on again. But that shouldn't be needed.

user_6630084 · Answer

What I did in my application is just called player1.Stop(); when the Windows is going to suspend mode.

MainWindow.xaml

MainWindow.xaml.cs

public partial class MainWindow : Window
{
    MediaPlayer player1;

    // Last play position before going to suspend mode
    private TimeSpan LastPosition = TimeSpan.Zero;

    public MainWindow()
    {
        InitializeComponent();
        player1 = new MediaPlayer();
        player1.MediaEnded += Player1_MediaEnded;            
    }

    private void OpenMedia()
    {
        player1.Open(new Uri(@"M:\Sting.wav"));
        //player1.Open(new Uri(@"M:\ring.wav"));
    }

    private void Player1_MediaEnded(object sender, EventArgs e)
    {
        LastPosition = TimeSpan.Zero;            
    }

    private void Button_PlayResume(object sender, RoutedEventArgs e)
    {
        if (LastPosition != TimeSpan.Zero)
        {
            player1.Position = LastPosition; // Resume    
            LastPosition = TimeSpan.Zero;               
        }
        else
        {
            OpenMedia();
        }
        player1.Play();
    }

    private void Button_Pause(object sender, RoutedEventArgs e)
    {            
        player1.Pause();
        LastPosition = player1.Position;
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        SystemEvents.PowerModeChanged += OnPowerModeChanged;
    }

    private void OnPowerModeChanged(object sender, PowerModeChangedEventArgs e)
    {
        if (e.Mode == PowerModes.Suspend)
        {
            if (player1.CanPause)
            {
                player1.Pause();
                LastPosition = player1.Position;
            }
            player1.Stop();
        }
    }
}

The screen-shot:

This will work even when the MediaPlayer is playing something. After resuming from sleeping mode press on Play/Resume button to continue playing from the latest position.

MediaPlayer doesn't play after computer sleeps

1 Answers