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PODataContext - ListView - Refresh UI - INotifyPropertyChanged
 

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  1. PODataContext - ListView - Refresh UI - INotifyPropertyChanged
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    <p>Working on an windows store app, I try to update/refresh a listView when some data is updated. But despite all samples and documentations I read, it doesn't work...</p> <p>Here my code behind : (I do not provide my xaml files, it's just a sample listView).</p> <p>So the class which implements the INotifyPropertyChanged interface:</p> <pre><code>public class Download : INotifyPropertyChanged { public enum DownloadState { Running, Waiting, Pausing, Paused, Cancelling, Cancelled }; private String Uri; private StorageFile storageFile; private String tempFileName; private String fileName; private String version ; private long totalSize ; private long downloadedBytes; private DownloadState state; private Protocol protocol; public Download(String Uri, StorageFile file, String fileName, String version, long totalSize, Protocol protocol) { this.Uri = Uri; this.storageFile = file; this.tempFileName = ""; this.fileName = fileName; this.version = version; this.totalSize = totalSize; this.downloadedBytes = 0; this.state = DownloadState.Waiting; this.protocol = protocol; } public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged([CallerMemberName] String propertyName = "") { System.Diagnostics.Debug.WriteLine("Update!"); //ok if (PropertyChanged != null) { //PropertyChanged is always null and shouldn't. PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } public DownloadState State { get{return this.state;} set { this.state = value; NotifyPropertyChanged(); } } //+some others methods } } </code></pre> <p>And the main page of the metro app : </p> <pre><code>// The Basic Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234237 namespace ClientAirNavLight_WS { /// &lt;summary&gt; /// A basic page that provides characteristics common to most applications. /// &lt;/summary&gt; public sealed partial class MainPage : ClientAirNavLight_WS.Common.LayoutAwarePage { /// &lt;summary&gt; /// Represent a Web Service proxy. /// &lt;/summary&gt; private AirNavLight_WSClientClient proxyWS; /// &lt;summary&gt; /// Initiialize the component of the application's main page. /// &lt;/summary&gt; public MainPage() { this.InitializeComponent(); } /// &lt;summary&gt; /// Populates the page with content passed during navigation. Any saved state is also /// provided when recreating a page from a prior session. /// &lt;/summary&gt; /// &lt;param name="navigationParameter"&gt;The parameter value passed to /// &lt;see cref="Frame.Navigate(Type, Object)"/&gt; when this page was initially requested. /// &lt;/param&gt; /// &lt;param name="pageState"&gt;A dictionary of state preserved by this page during an earlier /// session. This will be null the first time a page is visited.&lt;/param&gt; protected override void LoadState(Object navigationParameter, Dictionary&lt;String, Object&gt; pageState) { } /// &lt;summary&gt; /// Preserves state associated with this page in case the application is suspended or the /// page is discarded from the navigation cache. Values must conform to the serialization /// requirements of &lt;see cref="SuspensionManager.SessionState"/&gt;. /// &lt;/summary&gt; /// &lt;param name="pageState"&gt;An empty dictionary to be populated with serializable state.&lt;/param&gt; protected override void SaveState(Dictionary&lt;String, Object&gt; pageState) { } //Simulate data update. private async void Button_Click(object sender, RoutedEventArgs e) { object selected = this.ListResult.SelectedItem; if (selected != null) { //simulate an update in data. // ListView should be refresh in order to reflect changes made here. Download dl = (Download)selected; if (dl.State == Download.DownloadState.Paused) { dl.State = Download.DownloadState.Running; } else { dl.State = Download.DownloadState.Paused; } } else { //Just add an item to the list view. StorageFile file = await this.getStorageFile("test"); Download dl = new Download("192.128.2.14", file, "test", "1.2", 100, Protocol.HTTP); this.ListResult.Items.Add(dl); this.ListResult.DataContext = dl;// Does not work. } } private async Task&lt;StorageFile&gt; getStorageFile(String suggestedFileName) { FileSavePicker savePicker = new FileSavePicker(); savePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary; // Dropdown of file types the user can save the file as savePicker.FileTypeChoices.Add("Application/pdf", new List&lt;string&gt;() { ".pdf" }); savePicker.FileTypeChoices.Add("Archive", new List&lt;string&gt;() { ".zip", ".rar", ".7z" }); savePicker.FileTypeChoices.Add("Plain-text", new List&lt;string&gt;() { ".txt" }); // Default file name if the user does not type one in or select a file to replace savePicker.SuggestedFileName = suggestedFileName; return await savePicker.PickSaveFileAsync(); } } } </code></pre> <p>So How am I supposed to use listView.DataContext? Am I misunderstanding how use INotifyPropertyChanged?</p> <p><strong>EDIT :</strong></p> <p>How my listView is define : </p> <pre><code> &lt;ListView x:Name="ListResult" HorizontalAlignment="Left" Height="200" Margin="10,56,0,0" VerticalAlignment="Top" Width="653" SelectionMode="Single"/&gt; </code></pre>
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