public async Task Play(Song a, MediaElement m)
{
if (Songs.Count != 0)
{
if (Songs.Contains(a))
{
NowIndex = Songs.IndexOf(a);
}
else
{
Songs.Add(a);
NowIndex = Songs.IndexOf(a);
}
}
else
{
Songs.Add(a);
NowIndex = 0;
}
await Task.Run(() =>
{
a.PlayOnce();
});
var stream = await a.AudioFile.OpenAsync(Windows.Storage.FileAccessMode.Read);
m.SetSource(stream, a.AudioFile.ContentType);
OnNotifyPlayBackEvent(a);
}