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POListView. Check Count of Items and change Visibility
 

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    <p>I'm developing a Winrt application using MVVM. I have a ListView with a binding to a ObservableCollection. </p> <pre><code> &lt;ListView x:Name="TestListView" ItemsSource="{Binding TestItems}" Visibility="{Binding ListVis, Converter={StaticResource BoolToVisibilityConverter}}".../&gt; </code></pre> <p>My ObservableCollection:</p> <pre><code>public class SearchResultCollection : ObservableCollection&lt;TestData&gt;, ISupportIncrementalLoading { public IAsyncOperation&lt;LoadMoreItemsResult&gt; LoadMoreItemsAsync(uint count) { var res = AsyncInfo.Run(async c =&gt; { //ask about data from server return new LoadMoreItemsResult() {Count = PAGE_SIZE}; }); return res; } } </code></pre> <p>I also have TextBox with linked RelayCommand (executes on event "TextChanged"):</p> <pre><code>Search = new RelayCommand&lt;BehaviorEventArgs&gt;((e) =&gt; { dynamic sender = e.Sender; string text = sender.Text; _searchText = text; if (string.IsNullOrEmpty(text)) { TestItems= null; return; } ListVis = false; TestItems= new SearchResultCollection(_searchService, text); ((ObservableCollection&lt;TestData&gt;)Contacts).CollectionChanged += SearchViewModel_CollectionChanged; }); void SearchViewModel_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { if (((ObservableCollection&lt;Contact&gt;)sender).Count != 0) { ListVis = true; } } </code></pre> <p>I'm trying to do something like <a href="https://stackoverflow.com/a/5209102/466545">https://stackoverflow.com/a/5209102/466545</a>, but when the Visibility of ListView get state Collapsed the CollectionChanged is not fired anymore. When i remove the Visibility property and check the work without it, the CollectionChanged event fires like needed.</p>
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    1. PTQuestion
    1. USCommunity
    1. USd.lavysh
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    1. COI recommend you to try the width and height of ListView control to 0 on behalf of Collapsed visibility. You will need additional Converter or code-behind works, but may work fine. I cannot say definitely, but WinRT may not fire some events performance related issue. Likewise, please note that default WinRT binding is Mode=Oneway, not TwoWay.
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      1. POListView. Check Count of Items and change Visibility
      1. USYoungjae
    2. COThanks.I tryed with Opacity property and it works!
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      1. POListView. Check Count of Items and change Visibility
      1. USd.lavysh
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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