public static async void CheckCollection()
        {
            LoadCollectionCompleted = false;
            StorageFolder musicFolder  = KnownFolders.MusicLibrary;
            StorageFolder coversFolder = await ApplicationData.Current.LocalFolder.CreateFolderAsync("Covers", CreationCollisionOption.OpenIfExists);

            QueryOptions options = new QueryOptions();

            options.FileTypeFilter.Add(".mp3");
            options.FileTypeFilter.Add(".wma");
            options.FileTypeFilter.Add(".aac");
            options.FileTypeFilter.Add(".m4a");
            options.FolderDepth = FolderDepth.Deep;

            var songs = await musicFolder.CreateFileQueryWithOptions(options).GetFilesAsync();

            Stream fileStream = null;

            TagLib.File tagFile     = null;
            Song        aux         = null;
            string      title       = "";
            string      artist      = "";
            string      album       = "";
            string      genre       = "";
            string      trackNumber = "";
            string      year        = "";

            int totalCount = songs.Count;

            double currentValue      = 0;
            double percentagePerItem = Convert.ToDouble(100) / Convert.ToDouble(totalCount);

            List <Song> listOfSongs = new List <Song>();

            XmlDocument DOC = new XmlDocument();

            XmlElement mainElem = DOC.DocumentElement;
            XmlElement ELE      = DOC.CreateElement("Collection");

            DOC.AppendChild(ELE);
            XmlElement x = null;

            foreach (StorageFile file in songs)
            {
                try
                {
                    x          = DOC.CreateElement("Song");
                    fileStream = await file.OpenStreamForReadAsync();

                    tagFile = TagLib.File.Create(new StreamFileAbstraction(file.Name, fileStream, fileStream));

                    aux = new Song();

                    if (tagFile.Tag.Album != null || string.IsNullOrWhiteSpace(tagFile.Tag.Album) == false)
                    {
                        album = tagFile.Tag.Album;
                    }
                    else
                    {
                        album = "Unknown";
                    }

                    if (tagFile.Tag.Title == null || string.IsNullOrWhiteSpace(tagFile.Tag.Title))
                    {
                        title = file.DisplayName;
                    }
                    else
                    {
                        title = tagFile.Tag.Title;
                    }

                    if (tagFile.Tag.FirstAlbumArtist != null && string.IsNullOrWhiteSpace(tagFile.Tag.FirstAlbumArtist) == false)
                    {
                        artist = tagFile.Tag.FirstAlbumArtist;
                    }
                    else if (tagFile.Tag.FirstPerformer != null && string.IsNullOrWhiteSpace(tagFile.Tag.FirstPerformer) == false)
                    {
                        artist = tagFile.Tag.FirstPerformer;
                    }
                    else
                    {
                        artist = "Unknown";
                    }

                    trackNumber = Convert.ToString(tagFile.Tag.Track);
                    year        = Convert.ToString(tagFile.Tag.Year);

                    if (tagFile.Tag.FirstGenre != null && string.IsNullOrWhiteSpace(tagFile.Tag.FirstGenre) == false)
                    {
                        genre = tagFile.Tag.FirstGenre;
                    }
                    else
                    {
                        genre = string.Empty;
                    }

                    var matchingResults = listOfSongs.Where(s => s.GetArtist() == artist && s.GetAlbum() == album).ToList();

                    string albumid;
                    string hexColor = string.Empty;

                    if (matchingResults.Count() > 0)
                    {
                        albumid  = matchingResults[0].GetAlbumID();
                        hexColor = matchingResults[0].HexColor;
                    }
                    else
                    {
                        albumid = Guid.NewGuid().ToString();

                        if (tagFile.Tag.Pictures.Length > 0)
                        {
                            var dataVector = tagFile.Tag.Pictures[0].Data.Data;

                            SaveCoverImageResult result = await ImageHelper.SaveAlbumCover(dataVector, albumid);

                            hexColor = result.HexColor;
                            //ImageHelper.BlurAlbumCover(albumid);
                        }
                    }

                    string songid = Guid.NewGuid().ToString();

                    x.SetAttribute("Artist", artist);
                    x.SetAttribute("Title", title);
                    x.SetAttribute("Album", album);
                    x.SetAttribute("Path", file.Path);
                    x.SetAttribute("Genre", genre);
                    x.SetAttribute("Year", year);
                    x.SetAttribute("Track", trackNumber);
                    x.SetAttribute("AlbumID", albumid);
                    x.SetAttribute("ID", Guid.NewGuid().ToString());
                    x.SetAttribute("HexColor", hexColor);
                    aux.Set(title, artist, album, albumid, songid, year, trackNumber, genre, file.Path, hexColor);

                    listOfSongs.Add(aux);

                    DOC.FirstChild.AppendChild(x);


                    fileStream.Dispose();
                }
                catch
                {
                }

                currentValue = currentValue + percentagePerItem;

                if (PageHelper.PreparingCollection != null)
                {
                    PageHelper.PreparingCollection.UpdateStatus(Convert.ToInt32(currentValue));
                }
                else if (PageHelper.SetupWizard != null)
                {
                    PageHelper.SetupWizard.UpdateStatus(Convert.ToInt32(currentValue));
                }
            }

            StorageFolder collectionFolder = await ApplicationData.Current.LocalFolder.CreateFolderAsync("Collection", CreationCollisionOption.OpenIfExists);

            StorageFile collectionFile = await collectionFolder.CreateFileAsync("Collection.xml", CreationCollisionOption.ReplaceExisting);

            await DOC.SaveToFileAsync(collectionFile);

            await CollectionHelper.LoadCollectionFile();

            LoadCollectionCompleted = true;

            if (PageHelper.PreparingCollection != null)
            {
                PageHelper.PreparingCollection.LoadingCompleted();
            }
            else if (PageHelper.SetupWizard != null)
            {
                PageHelper.SetupWizard.LoadingCompleted();
            }
        }
        public static async Task <SaveCoverImageResult> SaveAlbumCover(byte[] dataVector, string albumid)
        {
            var displayInformation = DisplayInformation.GetForCurrentView();

            StorageFolder coversFolder = await ApplicationData.Current.LocalFolder.CreateFolderAsync("Covers", CreationCollisionOption.OpenIfExists);

            SaveCoverImageResult result;
            string hexColor = string.Empty;

            SaveCoverImageResult.Result resultState;

            if (dataVector != null)
            {
                try
                {
                    MemoryStream ms = new MemoryStream(dataVector);

                    ms.Position = 0;

                    StorageFile f = await coversFolder.CreateFileAsync("cover_" + albumid + ".jpg", CreationCollisionOption.ReplaceExisting);

                    IRandomAccessStream ras = ms.AsRandomAccessStream();

                    BitmapDecoder decoder = await BitmapDecoder.CreateAsync(ras);

                    double oldHeight = decoder.PixelHeight;
                    double oldWidth  = decoder.PixelWidth;
                    double newWidth  = 500;

                    if (oldWidth < 500)
                    {
                        newWidth = oldWidth;
                    }

                    double newHeight = (oldHeight * newWidth) / oldWidth;

                    BitmapTransform transform = new BitmapTransform()
                    {
                        ScaledWidth = (uint)newWidth, ScaledHeight = (uint)newHeight, InterpolationMode = BitmapInterpolationMode.NearestNeighbor
                    };
                    PixelDataProvider pixelData = await decoder.GetPixelDataAsync(
                        BitmapPixelFormat.Rgba8,
                        BitmapAlphaMode.Ignore,
                        transform,
                        ExifOrientationMode.RespectExifOrientation,
                        ColorManagementMode.DoNotColorManage);

                    using (var destinationStream = await f.OpenAsync(FileAccessMode.ReadWrite))
                    {
                        BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, destinationStream);

                        encoder.SetPixelData(BitmapPixelFormat.Rgba8, BitmapAlphaMode.Premultiplied, (uint)newWidth, (uint)newHeight, displayInformation.RawDpiX, displayInformation.RawDpiY, pixelData.DetachPixelData());
                        await encoder.FlushAsync();
                    }

                    hexColor = await ImageHelper.GetDominantColorHex(ras);

                    ras.Dispose();
                    ms.Dispose();

                    resultState = SaveCoverImageResult.Result.Succeded;
                }
                catch
                {
                    resultState = SaveCoverImageResult.Result.Failed;
                }
            }
            else
            {
                resultState = SaveCoverImageResult.Result.Failed;
            }

            result = new SaveCoverImageResult(hexColor, resultState);

            return(result);
        }
        public static async void LoadCollectionChanges()
        {
            if (LoadCollectionCompleted == false)
            {
                return;
            }

            Debug.WriteLine("INICIANDO BUSCA");

            //if (ApplicationInfo.Current.IsMobile)
            //{
            //    StatusBar.GetForCurrentView().ProgressIndicator.ProgressValue = null;
            //    StatusBar.GetForCurrentView().ProgressIndicator.Text = "Looking for your music...";
            //}

            LoadCollectionCompleted = false;

            bool changed = false;

            if (CollectionHelper.IsCollectionLoaded)
            {
                List <string> currentSongs = CollectionHelper.GetAllSongsPaths();
                List <string> folderSongs  = new List <string>();
                if (currentSongs != null)
                {
                    List <Song> listOfSongs = new List <Song>();
                    Song        aux         = null;

                    foreach (XmlElement element in GetAllSongs(false))
                    {
                        aux = new Song();
                        aux.Set(element.GetAttribute("Title"),
                                element.GetAttribute("Artist"),
                                element.GetAttribute("Album"),
                                element.GetAttribute("AlbumID"),
                                element.GetAttribute("ID"),
                                element.GetAttribute("Year"),
                                element.GetAttribute("Track"),
                                element.GetAttribute("Genre"),
                                element.GetAttribute("Path"),
                                element.GetAttribute("HexColor"));

                        listOfSongs.Add(aux);
                    }

                    StorageFolder musicFolder  = KnownFolders.MusicLibrary;
                    StorageFolder coversFolder = await ApplicationData.Current.LocalFolder.CreateFolderAsync("Covers", CreationCollisionOption.OpenIfExists);

                    QueryOptions options = new QueryOptions();
                    options.FileTypeFilter.Add(".mp3");
                    options.FileTypeFilter.Add(".wma");
                    options.FileTypeFilter.Add(".aac");
                    options.FileTypeFilter.Add(".m4a");
                    options.FolderDepth = FolderDepth.Deep;

                    var songs = await musicFolder.CreateFileQueryWithOptions(options).GetFilesAsync();

                    XmlElement  x           = null;
                    Stream      fileStream  = null;
                    TagLib.File tagFile     = null;
                    string      title       = "";
                    string      artist      = "";
                    string      album       = "";
                    string      genre       = "";
                    string      trackNumber = "";
                    string      year        = "";

                    int totalCount = songs.Count;

                    foreach (StorageFile file in songs)
                    {
                        folderSongs.Add(file.Path);
                    }

                    foreach (StorageFile file in songs)
                    {
                        if (file.FileType == ".mp3" || file.FileType == ".wma" || file.FileType == ".aac" || file.FileType == ".m4a")
                        {
                            if (currentSongs.Contains(file.Path) == false)
                            {
                                try
                                {
                                    x          = CollectionDocument.CreateElement("Song");
                                    fileStream = await file.OpenStreamForReadAsync();

                                    tagFile = TagLib.File.Create(new StreamFileAbstraction(file.Name, fileStream, fileStream));

                                    aux = new Song();

                                    if (tagFile.Tag.Album != null || string.IsNullOrWhiteSpace(tagFile.Tag.Album) == false)
                                    {
                                        album = tagFile.Tag.Album;
                                    }
                                    else
                                    {
                                        album = "Unknown";
                                    }

                                    if (tagFile.Tag.Title == null || string.IsNullOrWhiteSpace(tagFile.Tag.Title))
                                    {
                                        title = file.DisplayName;
                                    }
                                    else
                                    {
                                        title = tagFile.Tag.Title;
                                    }

                                    if (tagFile.Tag.FirstAlbumArtist != null && string.IsNullOrWhiteSpace(tagFile.Tag.FirstAlbumArtist) == false)
                                    {
                                        artist = tagFile.Tag.FirstAlbumArtist;
                                    }
                                    else if (tagFile.Tag.FirstPerformer != null && string.IsNullOrWhiteSpace(tagFile.Tag.FirstPerformer) == false)
                                    {
                                        artist = tagFile.Tag.FirstPerformer;
                                    }
                                    else
                                    {
                                        artist = "Unknown";
                                    }

                                    trackNumber = Convert.ToString(tagFile.Tag.Track);
                                    year        = Convert.ToString(tagFile.Tag.Year);

                                    if (tagFile.Tag.FirstGenre != null && string.IsNullOrWhiteSpace(tagFile.Tag.FirstGenre) == false)
                                    {
                                        genre = tagFile.Tag.FirstGenre;
                                    }
                                    else
                                    {
                                        genre = string.Empty;
                                    }

                                    var matchingResults = listOfSongs.Where(s => s.Artist == artist && s.Album == album).ToList();

                                    string albumid;
                                    string hexColor = string.Empty;

                                    if (matchingResults.Count() > 0)
                                    {
                                        albumid  = matchingResults[0].AlbumID;
                                        hexColor = matchingResults[0].HexColor;
                                    }
                                    else
                                    {
                                        albumid = Guid.NewGuid().ToString();

                                        if (tagFile.Tag.Pictures.Length > 0)
                                        {
                                            var dataVector = tagFile.Tag.Pictures[0].Data.Data;

                                            SaveCoverImageResult result = await ImageHelper.SaveAlbumCover(dataVector, albumid);

                                            hexColor = result.HexColor;
                                            //ImageHelper.BlurAlbumCover(albumid);
                                        }
                                    }

                                    string songid = Guid.NewGuid().ToString();

                                    x.SetAttribute("Artist", artist);
                                    x.SetAttribute("Title", title);
                                    x.SetAttribute("Album", album);
                                    x.SetAttribute("Path", file.Path);
                                    x.SetAttribute("Genre", genre);
                                    x.SetAttribute("Year", year);
                                    x.SetAttribute("Track", trackNumber);
                                    x.SetAttribute("AlbumID", albumid);
                                    x.SetAttribute("ID", songid);
                                    x.SetAttribute("HexColor", hexColor);
                                    aux.Set(title, artist, album, albumid, songid, year, trackNumber, genre, file.Path, hexColor);

                                    CollectionDocument.FirstChild.AppendChild(x);


                                    fileStream.Dispose();
                                    changed = true;

                                    listOfSongs.Add(aux);
                                }
                                catch
                                {
                                }
                            }
                        }
                    }

                    foreach (string file in currentSongs)
                    {
                        if (folderSongs.Contains(file) == false)
                        {
                            IXmlNode node = CollectionDocument.SelectSingleNode("/Collection/Song[@Path=\"" + file + "\"]");

                            IXmlNode parent = node.ParentNode;

                            // remove the child node
                            parent.RemoveChild(node);
                            changed = true;
                        }
                    }

                    StorageFolder collectionFolder = await ApplicationData.Current.LocalFolder.CreateFolderAsync("Collection", CreationCollisionOption.OpenIfExists);

                    StorageFile collectionFile = await collectionFolder.CreateFileAsync("Collection.xml", CreationCollisionOption.ReplaceExisting);

                    await CollectionDocument.SaveToFileAsync(collectionFile);

                    await CollectionHelper.LoadCollectionFile();

                    if (changed)
                    {
                        if (PageHelper.Artists != null)
                        {
                            PageHelper.Artists.CollectionHasBeenUpdated = true;
                        }

                        if (PageHelper.Albums != null)
                        {
                            PageHelper.Albums.CollectionHasBeenUpdated = true;
                        }

                        if (PageHelper.Songs != null)
                        {
                            PageHelper.Songs.CollectionHasBeenUpdated = true;
                        }
                    }
                }
            }

            Debug.WriteLine("BUSCA CONCLUÍDA");

            if (ApplicationInfo.Current.IsMobile)
            {
                StatusBar.GetForCurrentView().ProgressIndicator.ProgressValue = 0;
                StatusBar.GetForCurrentView().ProgressIndicator.Text = "";
            }

            LoadCollectionCompleted = true;
        }