如何使用CollectionViewSource对LongListSelector进行排序

我有一个LongListSelector ，当前正在填充来自IsolatedStorage图像。 我希望能够按日期按升序或降序对这些进行排序。 我一直在参考http://babaandthepigman.wordpress.com/2011/07/03/wp7-collectionviewsource-sorting-a-listbox/寻求帮助。 出于某种原因，我无法将LongListSelector的ItemsSource绑定到CollectionViewSource以实现排序function。

PictureRepository.cs（在应用程序启动时从IsolatedStorage加载图片）

 #region Constants public const string IsolatedStoragePath = "Pictures"; #endregion #region Properties public ObservableCollection Pictures { get; private set; } #endregion #region Singleton Pattern private PictureRepository() { LoadAllPicturesFromIsolatedStorage(); } public static readonly PictureRepository Instance = new PictureRepository(); #endregion /// 
 /// Saves to local storage /// This method gets two parameters: the captured picture instance and the name of the pictures folder in the isolated storage /// 
 ///  ///  public void SaveToLocalStorage(CapturedPicture capturedPicture, string directory) { //call IsolatedStorageFile.GetUserStoreForApplication to get an isolated storage file var isoFile = IsolatedStorageFile.GetUserStoreForApplication(); //Call the IsolatedStorageFile.EnsureDirectory extension method located in the Common IsolatedStorageFileExtensions class to confirm that the pictures folder exists. isoFile.EnsureDirectory(directory); //Combine the pictures folder and captured picture file name and use this path to create a new file string filePath = Path.Combine(directory, capturedPicture.FileName); using (var fileStream = isoFile.CreateFile(filePath)) { using (var writer = new BinaryWriter(fileStream)) { capturedPicture.Serialize(writer); } } } /// 
 /// To load all saved pictures and add them to the pictures list page /// 
 public CapturedPicture LoadFromLocalStorage(string fileName, string directory) { //To open the file, add a call to the IsolatedStorageFile.GetUserStoreForApplication var isoFile = IsolatedStorageFile.GetUserStoreForApplication(); //Combine the directory and file name string filePath = Path.Combine(directory, fileName); //use the path to open the picture file from the isolated storage by using the IsolatedStorageFile.OpenFile method using (var fileStream = isoFile.OpenFile(filePath, FileMode.Open, FileAccess.Read)) { //create a BinaryReader instance for deserializing the CapturedPicture instance using (var reader = new BinaryReader(fileStream)) { var capturedPicture = new CapturedPicture(); //create a new instance of the type CapturedPicture called CapturedPicture.Deserialize to deserialize the captured picture and return it capturedPicture.Deserialize(reader); return capturedPicture; } } } /// 
 /// To load all the pictures at start time /// 
 private void LoadAllPicturesFromIsolatedStorage() { //add call to the IsolatedStorageFile.GetUserStoreForApplication to open an isolated storage file var isoFile = IsolatedStorageFile.GetUserStoreForApplication(); //Call the IsolatedStorageFile.EnsureDirectory extension method located in the Common IsolatedStorageFileExtensions class to confirm that the pictures folder exists isoFile.EnsureDirectory(IsolatedStoragePath); //Call the IsolatedStorageFile.GetFileNames using the pictures directory and *.jpg as a filter to get all saved pictures var pictureFiles = isoFile.GetFileNames(Path.Combine(IsolatedStoragePath, "*.jpg")); var pictures = new List(); //Iterate through all the picture files in the list and load each using the LoadFromLocalStorage you created earlier foreach (var pictureFile in pictureFiles) { var picture = LoadFromLocalStorage(pictureFile, IsolatedStoragePath); pictures.Add(picture); } Pictures = new ObservableCollection(pictures.OrderBy(x => x.DateTaken)); } 

App.xaml.cs

 public static PictureRepository PictureList { get { return PictureRepository.Instance; } } 

MainPage.xaml中

MainPage.xaml.cs中

 #region Fields public System.Windows.Data.CollectionViewSource Source { get; set; } #endregion protected override void OnNavigatedTo(NavigationEventArgs e) { //Recent.ItemsSource = App.PictureList.Pictures; //working, unsorted Source = new System.Windows.Data.CollectionViewSource(); Source.Source = App.PictureList.Pictures; //Not Working //Need some sort of Cast to IList for LongListSelector? Recent.ItemsSource = Source.View as IList(); if (Settings.AscendingSort.Value) { //Recent.ItemsSource = PictureRepository.Instance.Pictures.OrderBy(x => x.DateTaken); //Recent.ItemsSource = App.PictureList.Pictures.OrderBy(x => x.DateTaken); Source.SortDescriptions.Clear(); Source.SortDescriptions.Add(new SortDescription("Date", ListSortDirection.Ascending)); } else { //Recent.ItemsSource = PictureRepository.Instance.Pictures.OrderByDescending(x => x.DateTaken); //Recent.ItemsSource = App.PictureList.Pictures.OrderByDescending(x => x.DateTaken); Source.SortDescriptions.Clear(); Source.SortDescriptions.Add(new SortDescription("Date", ListSortDirection.Descending)); } } 

Answer 1

如何在Windows Phone中对LongListSelector进行排序是最好和最简单的解决方案。 略微改变了我的实现，但效果很好。