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Playlist Classe

Definizione

Fornisce l'accesso a una playlist multimediale.

public ref class Playlist sealed
/// [Windows.Foundation.Metadata.Activatable(65536, Windows.Media.Playlists.PlaylistsContract)]
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Media.Playlists.PlaylistsContract, 65536)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
class Playlist final
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Media.Playlists.PlaylistsContract, 65536)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
/// [Windows.Foundation.Metadata.Activatable(65536, "Windows.Media.Playlists.PlaylistsContract")]
class Playlist final
[Windows.Foundation.Metadata.Activatable(65536, typeof(Windows.Media.Playlists.PlaylistsContract))]
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Media.Playlists.PlaylistsContract), 65536)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
public sealed class Playlist
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Media.Playlists.PlaylistsContract), 65536)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
[Windows.Foundation.Metadata.Activatable(65536, "Windows.Media.Playlists.PlaylistsContract")]
public sealed class Playlist
function Playlist()
Public NotInheritable Class Playlist
Ereditarietà
Object Platform::Object IInspectable Playlist
Attributi

Requisiti Windows

Famiglia di dispositivi
Windows Desktop Extension SDK (è stato introdotto in 10.0.10240.0)
API contract
Windows.Media.Playlists.PlaylistsContract (è stato introdotto in v1.0)

Esempio

Questo esempio è un estratto dall'esempio Playlist. Vedere l'esempio per la soluzione completa.

// Create and save a playlist from a set of audio files.
async private void PickAudioButton_Click(object sender, RoutedEventArgs e)
{
    FileOpenPicker picker = MainPage.CreateFilePicker(MainPage.audioExtensions);
    IReadOnlyList<StorageFile> files = await picker.PickMultipleFilesAsync();

    if (files.Count > 0)
    {
        Playlist playlist = new Playlist();

        foreach (StorageFile file in files)
        {
            playlist.Files.Add(file);
        }

        StorageFolder folder = KnownFolders.MusicLibrary;
        string name = "Sample";
        NameCollisionOption collisionOption = NameCollisionOption.ReplaceExisting;
        PlaylistFormat format = PlaylistFormat.WindowsMedia;

        try
        {
            StorageFile savedFile = await playlist.SaveAsAsync(folder, name, collisionOption, format);
            this.rootPage.NotifyUser(savedFile.Name + " was created and saved with " + files.Count + " files.", NotifyType.StatusMessage);
        }
        catch (Exception error)
        {
            rootPage.NotifyUser(error.Message, NotifyType.ErrorMessage);
        }
    }
    else
    {
        rootPage.NotifyUser("No files picked.", NotifyType.ErrorMessage);
    }
}

// Pick playlist and display its contents.
async private void PickPlaylistButton_Click(object sender, RoutedEventArgs e)
{
    Playlist playlist = await PickPlaylistAsync();

    if (playlist != null)
    {
        string result = "Songs in playlist: " + playlist.Files.Count.ToString() + "\n";

        foreach (StorageFile file in playlist.Files)
        {
            MusicProperties properties = await file.Properties.GetMusicPropertiesAsync();
            result += "\n";
            result += "File: " + file.Path + "\n";
            result += "Title: " + properties.Title + "\n";
            result += "Album: " + properties.Album + "\n";
            result += "Artist: " + properties.Artist + "\n";
        }

        this.OutputStatus.Text = result;
    }
}

private async Task<Playlist> PickPlaylistAsync()
{
    FileOpenPicker picker = CreateFilePicker(MainPage.playlistExtensions);
    StorageFile file = await picker.PickSingleFileAsync(); 

    if (file == null)
    {
        NotifyUser("No playlist picked.", NotifyType.ErrorMessage);
        return null;
    }

    try
    {
        return await Playlist.LoadAsync(file);
    }
    catch (Exception ex)
    {
        NotifyUser(ex.Message, NotifyType.ErrorMessage);
        return null;
    }
}

Commenti

Questa API viene usata per salvare e caricare i file della playlist da e verso il disco. Per informazioni sulla riproduzione di elenchi di elementi multimediali, vedere Elementi multimediali, playlist e tracce.

Costruttori

Playlist()

Crea una nuova istanza di un oggetto Playlist .

Proprietà

Files

Set di file multimediali che costituiscono la playlist.

Metodi

LoadAsync(IStorageFile)

Carica in modo asincrono i file in una playlist.

SaveAsAsync(IStorageFolder, String, NameCollisionOption)

Salva in modo asincrono la playlist in un file e una cartella specificati.

SaveAsAsync(IStorageFolder, String, NameCollisionOption, PlaylistFormat)

Salva in modo asincrono la playlist in un file e una cartella specificati, in un formato specificato.

SaveAsync()

Salva in modo asincrono la playlist.

Si applica a

Vedi anche