如何让Windows Media Player控制全屏播放？

Question

首先，我获取所有YouTube视频的列表，并将列表添加到listBox：

static List<string> videosList = new List<string>();
        static List<string> videosUrl = new List<string>();
        public async void RetrieveUploadsList()
        {
            UserCredentials();
            var youtubeService = new YouTubeService(new BaseClientService.Initializer()
            {
                HttpClientInitializer = credential,
                ApplicationName = Assembly.GetExecutingAssembly().GetName().Name
            });

            var channelsListRequest = youtubeService.Channels.List("contentDetails");
            channelsListRequest.Mine = true;

            var channelsListResponse = await channelsListRequest.ExecuteAsync();

            foreach (var channel in channelsListResponse.Items)
            {
                var uploadsListId = channel.ContentDetails.RelatedPlaylists.Uploads;

                Console.WriteLine("Videos in list {0}", uploadsListId);

                var nextPageToken = "";
                while (nextPageToken != null)
                {
                    var playlistItemsListRequest = youtubeService.PlaylistItems.List("snippet");
                    playlistItemsListRequest.PlaylistId = uploadsListId;
                    playlistItemsListRequest.MaxResults = 50;
                    playlistItemsListRequest.PageToken = nextPageToken;
                    var playlistItemsListResponse = await playlistItemsListRequest.ExecuteAsync();

                    foreach (var playlistItem in playlistItemsListResponse.Items)
                    {
                            videosList.Add(playlistItem.Snippet.Title + "  " + playlistItem.Snippet.ResourceId.VideoId);
                            videosUrl.Add("http://www.youtube.com/v/" + playlistItem.Snippet.ResourceId.VideoId);
                            listBox1.Items.Add(playlistItem.Snippet.Title + "  " + playlistItem.Snippet.PublishedAt);    
                    }
                    nextPageToken = playlistItemsListResponse.NextPageToken;
                }
            }
            if (this.listBox1.Items.Count > 80)
            {
                this.listBox1.SelectedIndex = 80;
                axWindowsMediaPlayer1.URL = videosUrl[80];
            }
        }

然后listBox1选择索引更改事件：

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            axWindowsMediaPlayer1.URL = videosUrl[listBox1.SelectedIndex];
        }

最后Windows媒体播放器控制播放状态更改事件：

private void axWindowsMediaPlayer1_PlayStateChange(object sender, AxWMPLib._WMPOCXEvents_PlayStateChangeEvent e)
        {
            e.newState = 2;
            if (e.newState == 3)
            {
                axWindowsMediaPlayer1.fullScreen = true;
            }
        }

问题是，在我点击任何内容开始播放列表中的任何视频之前，它正在进入PlayStateChange事件并尝试执行fullScreen = true似乎正在尝试自动开始播放视频。

所以我补充说：

e.newState = 2;

代码2表示暂停。但现在即使我点击播放按钮，它也会使这行e.newState = 2;它会被暂停。

我找不到办法让它不要自动开始播放或认为它。

您可以在此链接中看到e.newState的所有代码

newState codes

代码1 =已停止

代码2 =暂停

代码3 =正在播放