C# BackgroundAudioPlayer.Stop方法代碼示例

        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            switch (action)
            {
                case UserAction.Play:
                    if (PlayState.Playing != player.PlayerState)
                    {
                        player.Play();
                    }
                    break;

                case UserAction.Stop:
                    player.Stop();
                    break;

                case UserAction.Pause:
                    if (PlayState.Playing == player.PlayerState)
                    {
                        player.Pause();
                    }
                    break;
                case UserAction.Rewind:
                  player.Position = player.Position.Subtract(new TimeSpan(0,0,10));
                    break;

                case UserAction.FastForward:
                  player.Position = player.Position.Add(new TimeSpan(0,0,10));
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        /// Called when the playstate changes, except for the Error state (see OnError)
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time the playstate changed</param>
        /// <param name="playState">The new playstate of the player</param>
        /// <remarks>
        /// Play State changes cannot be cancelled. They are raised even if the application
        /// caused the state change itself, assuming the application has opted-in to the callback
        /// </remarks>
        protected override void OnPlayStateChanged(BackgroundAudioPlayer player, AudioTrack track, PlayState playState)
        {
            switch (playState)
            {
                case PlayState.TrackReady:
                    // The track to play is set in the PlayTrack method.
                    player.Volume = 1;
                    player.Play();
                    break;

                case PlayState.TrackEnded:
                    try
                    {
                        player.Stop();
                    }
                    catch (Exception e)
                    {
                        //Console.WriteLine(e);
                    }
                    break;
            }
            NotifyComplete();
        }

        /// <summary>
        /// Called when the playstate changes, except for the Error state (see OnError)
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time the playstate changed</param>
        /// <param name="playState">The new playstate of the player</param>
        /// <remarks>
        /// Play State changes cannot be cancelled. They are raised even if the application
        /// caused the state change itself, assuming the application has opted-in to the callback.
        /// 
        /// Notable playstate events: 
        /// (a) TrackEnded: invoked when the player has no current track. The agent can set the next track.
        /// (b) TrackReady: an audio track has been set and it is now ready for playack.
        /// 
        /// Call NotifyComplete() only once, after the agent request has been completed, including async callbacks.
        /// </remarks>
        protected override void OnPlayStateChanged(BackgroundAudioPlayer player, AudioTrack track, PlayState playState)
        {
            switch (playState)
            {
                case PlayState.TrackEnded:
                    player.Stop();
                    break;
                case PlayState.TrackReady:
                    player.Play();
                    break;
                case PlayState.Shutdown:
                    // TODO: Handle the shutdown state here (e.g. save state)
                    break;
                case PlayState.Unknown:
                    break;
                case PlayState.Stopped:
                    break;
                case PlayState.Paused:
                    player.Pause();
                    break;
                case PlayState.Playing:
                    break;
                case PlayState.BufferingStarted:
                    break;
                case PlayState.BufferingStopped:
                    break;
                case PlayState.Rewinding:
                    break;
                case PlayState.FastForwarding:
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        /// Called when the user requests an action using application/system provided UI
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">The data associated with the requested action.
        /// In the current version this parameter is only for use with the Seek action,
        /// to indicate the requested position of an audio track</param>
        /// <remarks>
        /// User actions do not automatically make any changes in system state; the agent is responsible
        /// for carrying out the user actions if they are supported.
        /// 
        /// Call NotifyComplete() only once, after the agent request has been completed, including async callbacks.
        /// </remarks>
        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            System.Diagnostics.Debug.WriteLine("UserAction player state: "+player.PlayerState);
            switch (action)
            {
                case UserAction.Play:

                    PlayTrack(player);
                    break;

                case UserAction.Stop:
                    player.Stop();
                    break;

            }
            System.Diagnostics.Debug.WriteLine("Before NOtify. ");
            NotifyComplete();
        }

        /// <summary>
        /// Called when the user requests an action using application/system provided UI
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">The data associated with the requested action.
        /// In the current version this parameter is only for use with the Seek action,
        /// to indicate the requested position of an audio track</param>
        /// <remarks>
        /// User actions do not automatically make any changes in system state; the agent is responsible
        /// for carrying out the user actions if they are supported.
        /// 
        /// Call NotifyComplete() only once, after the agent request has been completed, including async callbacks.
        /// </remarks>
        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            switch (action) {
                case UserAction.Play:
                    if (player.PlayerState != PlayState.Playing) {
                        player.Play();
                    }
                    break;
                case UserAction.Stop:
                    player.Stop();
                    break;
                case UserAction.Pause:
                    player.Pause();
                    break;
                case UserAction.FastForward:
                    player.FastForward();
                    break;
                case UserAction.Rewind:
                    player.Rewind();
                    break;
                case UserAction.Seek:
                    player.Position = (TimeSpan)param;
                    break;
                case UserAction.SkipNext:
                    try {
                        player.Track = GetNextTrack();
                    } catch (LastTrackException ex) {
                        player.Track = ex.Track;
                        player.Stop();
                    }
                    break;
                case UserAction.SkipPrevious:
                    if (player.Position > TimeSpan.FromSeconds(7)) {
                        player.Position = new TimeSpan(0);
                    } else {
                        AudioTrack previousTrack = GetPreviousTrack();
                        if (previousTrack != null) {
                            player.Track = previousTrack;
                        }
                    }
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        ///     Called when the user requests an action using application/system provided UI
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">
        ///     The data associated with the requested action.
        ///     In the current version this parameter is only for use with the Seek action,
        ///     to indicate the requested position of an audio track
        /// </param>
        /// <remarks>
        ///     User actions do not automatically make any changes in system state; the agent is responsible
        ///     for carrying out the user actions if they are supported.
        ///     Call NotifyComplete() only once, after the agent request has been completed, including async callbacks.
        /// </remarks>
        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            Debug.WriteLine("OnUserAction() action " + action);

            switch (action)
            {
                case UserAction.Play:
                    var task = Task.Run((Func<Task>)RunDownload);

                    if (player.PlayerState != PlayState.Playing)
                        player.Play();

                    task.ContinueWith(t => NotifyComplete());

                    return;
                case UserAction.Stop:
                    player.Stop();
                    break;
                case UserAction.Pause:
                    player.Pause();
                    break;
                case UserAction.FastForward:
                    player.FastForward();
                    break;
                case UserAction.Rewind:
                    player.Rewind();
                    break;
                case UserAction.Seek:
                    player.Position = (TimeSpan)param;
                    break;
                case UserAction.SkipNext:
                    player.Track = GetNextTrack();
                    break;
                case UserAction.SkipPrevious:
                    var previousTrack = GetPreviousTrack();
                    if (previousTrack != null)
                        player.Track = previousTrack;
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        /// Called when the user requests an action using application/system provided UI
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">The data associated with the requested action.
        /// In the current version this parameter is only for use with the Seek action,
        /// to indicate the requested position of an audio track</param>
        /// <remarks>
        /// User actions do not automatically make any changes in system state; the agent is responsible
        /// for carrying out the user actions if they are supported.
        /// 
        /// Call NotifyComplete() only once, after the agent request has been completed, including async callbacks.
        /// </remarks>
        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            switch (action)
            {
                case UserAction.Play:
                    loadfile();
                    PlayTrack(player);
                    break;

                case UserAction.Pause:
                    player.Pause();
                    break;
                case UserAction.Stop:
                    player.Stop();
                    break;
                case UserAction.SkipPrevious:
                    PlayPreviousTrack(player);
                    break;

                case UserAction.SkipNext:
                    PlayNextTrack(player);
                    break;
                case UserAction.Seek:
                    
                    player.Position = (TimeSpan)param;
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        /// Called when the user requests an action using application/system provided UI
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">The data associated with the requested action.
        /// In the current version this parameter is only for use with the Seek action,
        /// to indicate the requested position of an audio track</param>
        /// <remarks>
        /// User actions do not automatically make any changes in system state; the agent is responsible
        /// for carrying out the user actions if they are supported.
        /// 
        /// Call NotifyComplete() only once, after the agent request has been completed, including async callbacks.
        /// </remarks>
        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            switch (action)
            {
                case UserAction.Play:
                    try
                    {
                        if (player.PlayerState != PlayState.Playing)
                        {
                            Debug.WriteLine("User.Action: Play");
                            player.Play();
                        }
                    }
                    catch (InvalidOperationException e)
                    {
                        Debug.WriteLine("Exception: " + e.Message);
                    }
                    catch (SystemException syse)
                    {
                        Debug.WriteLine("Exception: " + syse.Message);
                    }
                    break;
                case UserAction.Stop:
                    try
                    {
                        if (player.PlayerState != PlayState.Stopped) {
                            updatePlayposForCurrentEpisode(player);
                            player.Stop();
                            Debug.WriteLine("User.Action: Stop");
                        }
                    }
                    catch (Exception e)
                    {
                       Debug.WriteLine("Exception: " + e.Message);
                    }
                    break;

                case UserAction.Pause:
                    Debug.WriteLine("User.Action: Pause");
                    try
                    {
                        if (player.PlayerState == PlayState.Playing)
                        {
                            updatePlayposForCurrentEpisode(player);
                            player.Pause();
                        }
                    }
                    catch (InvalidOperationException e)
                    {
                        Debug.WriteLine("Exception: " + e.Message);
                    }
                    break;

                case UserAction.Seek:
                    try
                    {
                        if (player.PlayerState == PlayState.Playing)
                        {
                            player.Position = (TimeSpan)param;
                        }
                    }
                    catch (InvalidOperationException e)
                    {
                        Debug.WriteLine("Exception: " + e.Message);
                    }
                    break;

                case UserAction.SkipNext:
                    Debug.WriteLine("Skip next.");
                    updatePlayposForCurrentEpisode(player);
                    AudioTrack nextTrack = getNextPlaylistTrack();

                    if (nextTrack == null)
                    {
                        player.Position = (player.Position.TotalSeconds + 30 < player.Track.Duration.TotalSeconds) ? TimeSpan.FromSeconds(player.Position.TotalSeconds + 30) :
                                                                                                                     TimeSpan.FromSeconds(player.Track.Duration.TotalSeconds);
                    }
                    else
                    {
                        player.Track = nextTrack;
                        player.Play();
                    }
                    break;

                case UserAction.FastForward:
//.........這裏部分代碼省略.........

        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            switch (action)
            {
                case UserAction.Play:
                    PlayTrack(player);
                    break;

                case UserAction.Pause:
                    try
                    {
                        if (player.CanPause)
                        {
                            player.Pause();
                        }
                    }
                    catch (UnauthorizedAccessException ex)
                    {
                        // what the fuck??
                    }
                    break;

                case UserAction.SkipPrevious:
                    PlayPreviousTrack(player);
                    break;

                case UserAction.SkipNext:
                    PlayNextTrack(player);
                    break;

                case UserAction.Stop:
                    player.Stop();
                    break;

                case UserAction.FastForward:
                    player.FastForward();
                    break;

                case UserAction.Rewind:
                    player.Rewind();
                    break;

                case UserAction.Seek:
                    player.Position = (TimeSpan)param;
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        /// Called when the user requests an action using application/system provided UI
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">The data associated with the requested action.
        /// In the current version this parameter is only for use with the Seek action,
        /// to indicate the requested position of an audio track</param>
        /// <remarks>
        /// User actions do not automatically make any changes in system state; the agent is responsible
        /// for carrying out the user actions if they are supported.
        ///
        /// Call NotifyComplete() only once, after the agent request has been completed, including async callbacks.
        /// </remarks>
        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            switch (action)
            {
                case UserAction.Play:
                    if (player.PlayerState != PlayState.Playing)
                    {
                        player.Play();
                    }
                    break;
                case UserAction.Stop:
                    player.Stop();
                    break;
                case UserAction.Pause:
                    player.Pause();
                    break;
                default:
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        /// Called when the user requests an action using system-provided UI and the application has requesed
        /// notifications of the action
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">The data associated with the requested action.
        /// In the current version this parameter is only for use with the Seek action,
        /// to indicate the requested position of an audio track</param>
        /// <remarks>
        /// User actions do not automatically make any changes in system state; the agent is responsible
        /// for carrying out the user actions if they are supported
        /// </remarks>
        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            switch (action)
            {
                case UserAction.FastForward:
                    player.FastForward();
                    break;
                case UserAction.Pause:
                    player.Pause();
                    break;
                case UserAction.Play:
                    if (player.PlayerState == PlayState.Paused)
                    {
                        player.Play();
                    }
                    else
                    {
                        Play(player);
                    }
                    break;
                case UserAction.Rewind:
                    player.Rewind();
                    break;
                case UserAction.Seek:
                    player.Position = (TimeSpan)param;
                    break;
                case UserAction.SkipNext:
                    PlayNext(player);
                    break;
                case UserAction.SkipPrevious:
                    PlayPrev(player);
                    break;
                case UserAction.Stop:
                    player.Stop();
                    break;
                default:
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        /// Called when the user requests an action using application/system provided UI
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">The data associated with the requested action.
        /// In the current version this parameter is only for use with the Seek action,
        /// to indicate the requested position of an audio track</param>
        /// <remarks>
        /// User actions do not automatically make any changes in system state; the agent is responsible
        /// for carrying out the user actions if they are supported.
        /// 
        /// Call NotifyComplete() only once, after the agent request has been completed, including async callbacks.
        /// </remarks>
        protected override async void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            await ConfigureThePlayer();
            switch (action)
            {
                case UserAction.Play:
                    if (player.PlayerState != PlayState.Playing)
                    {
                        _logger.Info("OnUserAction.Play");
                        player.Play();
                    }
                    break;
                case UserAction.Stop:
                    _logger.Info("OnUserAction.Stop");
                    player.Stop();
                    break;
                case UserAction.Pause:
                    _logger.Info("OnUserAction.Pause");
                    player.Pause();
                    break;
                case UserAction.FastForward:
                    _logger.Info("OnUserAction.FastForward");
                    player.FastForward();
                    break;
                case UserAction.Rewind:
                    _logger.Info("OnUserAction.Rewind");
                    player.Rewind();
                    break;
                case UserAction.Seek:
                    player.Position = (TimeSpan)param;
                    break;
                case UserAction.SkipNext:
                    _logger.Info("OnUserAction.SkipNext");
                    var nextTrack = await GetNextTrack();
                    if (nextTrack != null)
                    {
                        player.Track = nextTrack;
                    }
                    await InformOfPlayingTrack();
                    break;
                case UserAction.SkipPrevious:
                    _logger.Info("OnUserAction.SkipPrevious");
                    var previousTrack = await GetPreviousTrack();
                    if (previousTrack != null)
                    {
                        player.Track = previousTrack;
                    }
                    await InformOfPlayingTrack();
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        /// Called when the user requests an action using system-provided UI and the application has requesed
        /// notifications of the action
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">The data associated with the requested action.
        /// In the current version this parameter is only for use with the Seek action,
        /// to indicate the requested position of an audio track</param>
        /// <remarks>
        /// User actions do not automatically make any changes in system state; the agent is responsible
        /// for carrying out the user actions if they are supported
        /// </remarks>
        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action,
                                             object param)
        {
            switch (action)
            {
                case UserAction.Play:
                    playTrack(player);
                    break;

                case UserAction.Stop:
                    player.Stop();
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        /// Called when the user requests an action using application/system provided UI
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">The data associated with the requested action.
        /// In the current version this parameter is only for use with the Seek action,
        /// to indicate the requested position of an audio track</param>
        /// <remarks>
        /// User actions do not automatically make any changes in system state; the agent is responsible
        /// for carrying out the user actions if they are supported.
        /// 
        /// Call NotifyComplete() only once, after the agent request has been completed, including async callbacks.
        /// </remarks>
        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            switch (action)
            {
                case UserAction.Play:
                    if (player.PlayerState == PlayState.Paused)
                        PopulatePlaylist(false);
                    else
                        PopulatePlaylist(true);
                    if (currentPlaylist != null && currentPlaylist.Count > 0)
                    {
                        player.Track = currentPlaylist[currentTrackNumber];
                    }
                    break;
                case UserAction.Stop:
                    currentPlaylist = null;
                    currentTrackNumber = 0;
                    player.Stop();
                    break;
                case UserAction.Pause:
                    player.Pause();
                    break;
                case UserAction.FastForward:
                    player.FastForward();
                    break;
                case UserAction.Rewind:
                    player.Rewind();
                    break;
                case UserAction.Seek:
                    player.Position = (TimeSpan)param;
                    break;
                case UserAction.SkipNext:
                    if (currentPlaylist != null && currentPlaylist.Count > 0)
                        player.Track = GetNextTrack();
                    break;
                case UserAction.SkipPrevious:
                    if (currentPlaylist != null && currentPlaylist.Count > 0)
                        player.Track = GetPreviousTrack();
                    break;
            }

            NotifyComplete();
        }

        /// <summary>
        /// Called when the user requests an action using application/system provided UI
        /// </summary>
        /// <param name="player">The BackgroundAudioPlayer</param>
        /// <param name="track">The track playing at the time of the user action</param>
        /// <param name="action">The action the user has requested</param>
        /// <param name="param">The data associated with the requested action.
        /// In the current version this parameter is only for use with the Seek action,
        /// to indicate the requested position of an audio track</param>
        /// <remarks>
        /// User actions do not automatically make any changes in system state; the agent is responsible
        /// for carrying out the user actions if they are supported.
        /// 
        /// Call NotifyComplete() only once, after the agent request has been completed, including async callbacks.
        /// </remarks>
        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            switch (action)
            {
                case UserAction.Play:
                    //if (player.PlayerState != PlayState.Playing)
                    //{
                        // to get audio track
                        //player.Track = this.audioTrack;
                        //player.Play();
                    //}
                    if (player.Track == null)
                    {
                        currentTrack = 0;
                        player.Track = playlist[currentTrack];
                    }
                    else
                    {
                        player.Play();
                    }
                    break;
                case UserAction.Stop:
                    player.Stop();
                    break;
                case UserAction.Pause:
                    player.Pause();
                    break;
                case UserAction.FastForward:
                    player.FastForward();
                    break;
                case UserAction.Rewind:
                    player.Rewind();
                    break;
                case UserAction.Seek:
                    player.Position = (TimeSpan)param;
                    break;
                case UserAction.SkipNext:
                    //player.Track = GetNextTrack();
                    if (currentTrack < playlist.Count - 1)
                    {
                        currentTrack += 1;
                        player.Track = playlist[currentTrack];
                    }
                    else
                    {
                        player.Track = null;
                    }
                    break;
                case UserAction.SkipPrevious:
                    //AudioTrack previousTrack = GetPreviousTrack();
                    //if (previousTrack != null)
                    //{
                        //player.Track = previousTrack;
                    //}
                    break;
            }

            NotifyComplete();
        }