c# - 移动/添加/重命名文件时自动刷新 UWP 应用程序中的文件列表

Question

我正在为 UWP 开发一个简单的音乐播放器应用程序，我有几个问题。首先这是我的代码

 private async void Page_Loaded(object sender, RoutedEventArgs e)
        {
            StorageFolder folder = KnownFolders.MusicLibrary;    
            await RetrieveFilesInFolders(folder);
        }



  private async Task RetrieveFilesInFolders(StorageFolder parent)
        {
            foreach (var file in await parent.GetFilesAsync())
            {
                if (file.FileType == ".mp3")
                {
                    var songProperties = await file.Properties.GetMusicPropertiesAsync();
                    var currentThumb = await file.GetThumbnailAsync(ThumbnailMode.MusicView, 200, ThumbnailOptions.UseCurrentScale);

                    var albumCover = new BitmapImage();
                    albumCover.SetSource(currentThumb);

                    var song = new Song();
                    song.Title = songProperties.Title;
                    song.Artist = songProperties.Artist;
                    song.Album = songProperties.Album;
                    song.AlbumCover = albumCover;
                    song.SongFile = file;
                    song.FileName = file.Name;

                    SongUC songUc = new SongUC(song);
                    sp1.Children.Add(songUc);
                }
            }

            foreach (var folder in await parent.GetFoldersAsync())
            {
                await RetrieveFilesInFolders(folder);
            }
        }

用户控件

public SongUC(Song song)
        {
            this.InitializeComponent();
            txtTitle.Text = song.Title;
            txtAlbum.Text = song.Album;
            txtArtist.Text = song.Artist;
            txtName.Text = song.FileName;
            imgAlbumArt.Source = song.AlbumCover;
        }

1. 如何在添加、移动或重命名新歌曲时自动刷新返回的文件
2. 在 PageLoaded 事件处理程序中触发 RetrieveFilesInFolders 方法是获取所有歌曲的最佳方式。或者如果音乐文件夹中有大量音乐，它会减慢应用程序的速度
3. 如何在检索文件时使用动画来使事情看起来更好

Answer 1

如前所述here ，看看file queries和他们的 ContentsChanged事件。