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POwindows phone 7 progress bar for a listbox loading data
 

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    <p>Is there an event I can listen for when a listbox has completed loading it's data? I have a textbox and a listbox, when the user hits enter, the listbox is populated with results from a web service. I'd like to run the progress bar while the listbox is loading and collapse it when it's finished....</p> <p><strong>UPDATE</strong></p> <pre><code> &lt;controls:PivotItem Header="food" Padding="0 110 0 0"&gt; &lt;Grid x:Name="ContentFood" Grid.Row="2" &gt; &lt;StackPanel&gt; ... ... &lt;toolkit:PerformanceProgressBar Name="ppbFoods" HorizontalAlignment="Left" VerticalAlignment="Center" Width="466" IsIndeterminate="{Binding IsDataLoading}" Visibility="{Binding IsDataLoading, Converter={StaticResource BoolToVisibilityConverter}}" /&gt; &lt;!--Food Results--&gt; &lt;ListBox x:Name="lbFoods" ItemsSource="{Binding Foods}" Padding="5" SelectionChanged="lbFoods_SelectionChanged" Height="480" &gt; .... &lt;/ListBox&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/controls:PivotItem&gt; </code></pre> <p>Here is my helper converter class....</p> <pre><code> public class BoolToValueConverter&lt;T&gt; : IValueConverter { public T FalseValue { get; set; } public T TrueValue { get; set; } public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (value == null) return FalseValue; else return (bool)value ? TrueValue : FalseValue; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return value != null ? value.Equals(TrueValue) : false; } } public class BoolToStringConverter : BoolToValueConverter&lt;String&gt; { } public class BoolToBrushConverter : BoolToValueConverter&lt;Brush&gt; { } public class BoolToVisibilityConverter : BoolToValueConverter&lt;Visibility&gt; { } public class BoolToObjectConverter : BoolToValueConverter&lt;Object&gt; { } </code></pre> <p>In my App.xaml....</p> <pre><code> xmlns:HelperClasses="clr-namespace:MyVirtualHealthCheck.HelperClasses" ... &lt;HelperClasses:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" TrueValue="Visible" FalseValue="Collapsed" /&gt; </code></pre> <p>The viewModel....</p> <pre><code> ... public bool IsDataLoading { get; set; } ... public void GetFoods(string strSearch) { IsDataLoading = true; WCFService.dcFoodInfoCollection localFoods = IsolatedStorageCacheManager&lt;WCFService.dcFoodInfoCollection&gt;.Retrieve("CurrentFoods"); if (localFoods != null) { Foods = localFoods; } else { GetFoodsFromWCF(strSearch); } } public void GetFoodsFromWCF(string strSearch) { IsDataLoading = true; wcfProxy.GetFoodInfosAsync(strSearch); wcfProxy.GetFoodInfosCompleted += new EventHandler&lt;WCFService.GetFoodInfosCompletedEventArgs&gt;(wcfProxy_GetFoodInfosCompleted); } void wcfProxy_GetFoodInfosCompleted(object sender, WCFService.GetFoodInfosCompletedEventArgs e) { WCFService.dcFoodInfoCollection foods = e.Result; if (foods != null) { //set current foods to the results from the web service this.Foods = foods; this.IsDataLoaded = true; //save foods to phone so we can use cached results instead of round tripping to the web service again SaveFoods(foods); } else { Debug.WriteLine("Web service says: " + e.Result); } IsDataLoading = false; } </code></pre>
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