C# BackgroundAudioPlayer.Play方法代码示例

        /// <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.TrackReady:
                    player.Play();
                    break;

                case PlayState.TrackEnded:
                    player.Position = TimeSpan.Zero;
                    player.Play();
                    break;
            } NotifyComplete();
        }

        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.
        ///     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)
        {
            Debug.WriteLine("OnPlayStateChanged() playState " + playState);

            switch (playState)
            {
                case PlayState.TrackEnded:
                    player.Track = GetPreviousTrack();
                    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:
                    break;
                case PlayState.Playing:
                    break;
                case PlayState.BufferingStarted:
                    break;
                case PlayState.BufferingStopped:
                    break;
                case PlayState.Rewinding:
                    break;
                case PlayState.FastForwarding:
                    break;
            }

            NotifyComplete();
        }

        protected override void OnUserAction(BackgroundAudioPlayer player, AudioTrack track, UserAction action, object param)
        {
            ShellTile mainTile = ShellTile.ActiveTiles.FirstOrDefault();
            switch (action)
            {
                case UserAction.Play:
                    if (PlayState.Paused == player.PlayerState)
                    {
                        player.Play();

                        mainTile.Update(new StandardTileData
                        {
                            BackContent = "Play"
                        });

                    }
                    break;

                case UserAction.Pause:
                    player.Pause();

                    mainTile.Update(new StandardTileData
                    {
                        BackContent = "Pause"
                    });
                    break;
            }
            NotifyComplete();
        }

        /// <summary>
        /// playstate 更改时调用，但 Error 状态除外(参见 OnError)
        /// </summary>
        /// <param name="player">BackgroundAudioPlayer</param>
        /// <param name="track">在 playstate 更改时播放的曲目</param>
        /// <param name="playState">播放机的新 playstate </param>
        /// <remarks>
        /// 无法取消播放状态更改。即使应用程序
        /// 导致状态自行更改也会提出这些更改，假定应用程序已经选择了回调。
        ///
        /// 值得注意的 playstate 事件:
        /// (a) TrackEnded: 播放器没有当前曲目时激活。代理可设置下一曲目。
        /// (b) TrackReady: 音轨已设置完毕，现在可以播放。
        ///
        /// 只在代理请求完成之后调用一次 NotifyComplete()，包括异步回调。
        /// </remarks>
        protected override void OnPlayStateChanged(BackgroundAudioPlayer player, AudioTrack track, PlayState playState)
        {
            switch (playState)
            {
                case PlayState.TrackEnded:
                    //player.Track = GetPreviousTrack();
                    //player.Track = GetNextTrack();
                    PlayNextTrack(player);
                    break;
                case PlayState.TrackReady:
                    player.Play();
                    break;
                case PlayState.Shutdown:
                    // TODO: 在此处理关机状态(例如保存状态)
                    break;
                case PlayState.Unknown:
                    break;
                case PlayState.Stopped:
                    break;
                case PlayState.Paused:
                    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 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.Track = GetNextTrack();
                    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:
                    _playlistHelper.SetAllTracksToNotPlayingAndSave();
                    break;
                case PlayState.Paused:
                    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 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)
 {
     if (action == UserAction.Play)
         player.Play();
     else if (action == UserAction.Pause)
         player.Pause();
     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.Track = GetPreviousTrack();
                    player.Track = null;
                    break;
                case PlayState.TrackReady:
                    player.Play();
                    connectedEvent.Set();

                    if (track != null && track.Tag != null)
                    {
                        var data = track.Tag.ToString().Split('$');
                        var url = data[data.Length - 1];
                        var title = data[1];
                        var type = data[2];

                        //#region from http://stackoverflow.com/questions/7159900/detect-application-launch-from-universal-volume-control
                        //MediaHistoryItem nowPlaying = new MediaHistoryItem();
                        //nowPlaying.Title = title;
                        //nowPlaying.PlayerContext.Add("station", title);
                        //MediaHistory.Instance.NowPlaying = nowPlaying;
                        //#endregion
                    }
                    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:
                    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 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.TrackReady:
                    // Wiedergabe wurde in PlayTrack() bereits festgelegt
                    player.Play();
                    break;
                case PlayState.TrackEnded:
                    PlayNextTrack(player);
                    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.TrackEnded:
                    PlayNext(player);
                    break;
                case PlayState.TrackReady:
                    player.Play();
                    break;
                default:
                    break;
            }

            NotifyComplete();
        }

        private void PlayPreviousTrack(BackgroundAudioPlayer player)
        {
            if (_playList.Count == 0)
            {
                loadPlaylist();
            }
            else if (--currentTrackNumber < 0)
            {
                currentTrackNumber = _playList.Count - 1;
                StorageUtility.writeStringToFile(IsolatedStorageFile.GetUserStoreForApplication(),
                "CurrentTrackNumber.txt",
                currentTrackNumber.ToString(CultureInfo.InvariantCulture));
            }

            player.Track = _playList[currentTrackNumber];
            player.Play();
        }

        protected override void OnPlayStateChanged(BackgroundAudioPlayer player, AudioTrack track, PlayState playState)
        {
            switch (playState)
            {
                case PlayState.TrackEnded:
                    player.Close();
                    break;

                case PlayState.TrackReady:
                    player.Volume = 1.0;
                    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:
                    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 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.Track = GetPreviousTrack();
                    if (currentTrack < playlist.Count - 1)
                    {
                        currentTrack += 1;
                        player.Track = playlist[currentTrack];
                    }
                    else
                    {
                        player.Track = null;
                    }
                    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:
                    break;
                case PlayState.Playing:
                    break;
                case PlayState.BufferingStarted:
                    break;
                case PlayState.BufferingStopped:
                    break;
                case PlayState.Rewinding:
                    break;
                case PlayState.FastForwarding:
                    break;
            }

            NotifyComplete();
        }

        private void PlayTrack(BackgroundAudioPlayer player)
        {
            if (NetworkInterface.GetIsNetworkAvailable())
            {
                string numberString = StorageUtility.readStringFromFile(IsolatedStorageFile.GetUserStoreForApplication(),
                                                       "CurrentTrackNumber.txt");
                if (numberString != null)
                    currentTrackNumber = Int16.Parse(numberString);
                if (_playList.Count == 0)
                {
                    loadPlaylist();
                }
                else
                {
                    player.Track = _playList[currentTrackNumber];
                    player.Play();
                }

            }
        }

        /// <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();
        }