private void JumpPre() { var pre = HistoryImageProvider.Previous(image.Date); if (pre != null) { image = pre; } else { image = HistoryImageProvider.Last(); } LoadImageAsync(); }
public async void PreWallpaper() { if (CurrentWallpaper != null) { var newImage = HistoryImageProvider.Previous(this.CurrentWallpaper.Date); if (newImage != null) { this.CurrentWallpaper = newImage; await UpdateWallpaper(); } else { this.CurrentWallpaper = HistoryImageProvider.Last(); await UpdateWallpaper(); } } else { RandomWallpaper(); } }