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POHow to bind the view model to the view
 

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  1. POHow to bind the view model to the view
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    <p>I am having trouble binding my <code>View Model</code> to my <code>View</code>. I am a beginner with <code>MVVM</code>, but I believe I am implementing my system (almost) correctly. I have a <code>Model</code> that contains data, which I am getting in my <code>View Model</code>, and then when my page is navigated to, I am attempting to grab that <code>View Model</code> data and binding it to the <code>View</code>. </p> <p>My issue is that I have a <code>ListBox</code> in my <code>View</code> with 3 objects per item, and I cannot seem to bind to it correctly for each item in my list.</p> <p><strong>MainPage.xaml</strong></p> <pre><code>&lt;ListBox x:Name="FavoritesListBox" ItemsSource="{Binding FavoriteItems}" SelectionChanged="FavoritesListBox_SelectionChanged"&gt; &lt;StackPanel Orientation="Horizontal" Margin="12,0,12,0"&gt; &lt;Image x:Name="favicon" Source="{Binding Favicon}" Width="50" Height="50"/&gt; &lt;StackPanel&gt; &lt;TextBlock x:Name="favoritesName" Text="{Binding Name}" FontSize="{StaticResource PhoneFontSizeExtraLarge}"/&gt; &lt;TextBlock x:Name="favoritesAddress" Text="{Binding Address}" Margin="12,0,0,0"/&gt; &lt;/StackPanel&gt; &lt;/StackPanel&gt; &lt;/ListBox&gt; </code></pre> <p><strong>MainPage.xaml.cs</strong></p> <pre><code>public FavoritesPage() { InitializeComponent(); // Set the data context of the listbox control to the sample data FavoritesListBox.DataContext = App.ViewModel; } </code></pre> <p><strong>App.xaml.cs</strong></p> <pre><code>private static MainViewModel viewModel = null; public static MainViewModel ViewModel { get { // Delay creation of the view model until necessary if (viewModel == null) viewModel = new MainViewModel(); return viewModel; } } </code></pre> <p><strong>MainViewModel.cs</strong></p> <pre><code>public ObservableCollection&lt;ItemViewModel&gt; FavoriteItems { get; private set; } public MainViewModel() { //FavoriteItems = new ObservableCollection&lt;ItemViewModel&gt;(); FavoriteItems = Settings.FavoritesList.Value; } </code></pre> <p><strong>Settings.cs (The Model)</strong></p> <pre><code>public static Setting&lt;ObservableCollection&lt;ItemViewModel&gt;&gt; FavoritesList = new Setting&lt;ObservableCollection&lt;ItemViewModel&gt;&gt;( "Favorites", new ObservableCollection&lt;ItemViewModel&gt;()); </code></pre> <p><strong>ItemViewModel.cs</strong></p> <pre><code>private string _favicon; public string Favicon { get { return _favicon; } set { if (value != _favicon) { _favicon = value; NotifyPropertyChanged("Favicon"); } } } private string _name; public string Name { get { return _name; } set { if (value != _name) { _name = value; NotifyPropertyChanged("Name"); } } } private string _address; public string Address { get { return _address; } set { if (value != _address) { _address = value; NotifyPropertyChanged("Address"); } } } public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged(String propertyName) { PropertyChangedEventHandler handler = PropertyChanged; if (null != handler) { handler(this, new PropertyChangedEventArgs(propertyName)); } } </code></pre> <p>..and this is where and how I am saving each item (which should have three properties listed in the <code>ItemViewModel</code></p> <pre><code>void addToFavorites_Click(object sender, EventArgs e) { var favoriteItem = new ItemViewModel{ Favicon = "", Name = "", Address = TheBrowser.currentUrl() }; Settings.FavoritesList.Value.Add(favoriteItem); } </code></pre> <p>Where <code>FavoritesList</code> is populated using an <code>ItemViewModel</code> containing 3 objects. The list is being populated correctly because during debugging I can see the entities in <code>FavoritesList</code>, but I am having an issue calling these entities in the <code>view model</code> to show up in my <code>ListBox</code> in the <code>view</code>? </p> <p>I believe I am binding incorrectly but I'm not sure how to fix this?</p>
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    1. USMatthew
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    1. COhttp://stackoverflow.com/questions/12151618/creating-contextbinding-xaml that may help you. I've been working on the same thing as well.
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    2. COIf you know we are going to use a viewmodel for your view to bind some of the properties, why we are using that "delay creation" of viewmodel ?
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      1. USMoble Joseph
    3. COI don't see your `ListBox.ItemTemplate` in your XAML. Your `ListBox` gets populated with a collection of `ItemViewModel`, however you need to set the `ListBox.ItemTemplate` to a `DataTemplate` containing your controls that bind to `ItemViewModel` to tell WPF how to draw each `ItemViewModel`
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