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POWPF TreeView-How to refresh tree after adding/removing node?
 

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    <p>I refer to this article:</p> <p><a href="https://stackoverflow.com/questions/1912481/wpf-treeview-hierarchicaldatatemplate-binding-to-object-with-multiple-child-col">WPF TreeView HierarchicalDataTemplate - binding to object with multiple child collections</a></p> <p>and modify the tree structure like:</p> <pre><code>Root |__Group |_Entry |_Source </code></pre> <p>In Entry.cs:</p> <pre><code>public class Entry { public int Key { get; set; } public string Name { get; set; } public ObservableCollection&lt;Source&gt; Sources { get; set; } public Entry() { Sources = new ObservableCollection&lt;Source&gt;(); } public ObservableCollection&lt;object&gt; Items { get { ObservableCollection&lt;object&gt; childNodes = new ObservableCollection&lt;object&gt;(); foreach (var source in this.Sources) childNodes.Add(source); return childNodes; } } } </code></pre> <p>In Source.cs:</p> <pre><code>public class Source { public int Key { get; set; } public string Name { get; set; } } </code></pre> <p>In XAML file:</p> <pre><code>&lt;UserControl.CommandBindings&gt; &lt;CommandBinding Command="New" Executed="Add" /&gt; &lt;/UserControl.CommandBindings&gt; &lt;TreeView x:Name="TreeView"&gt; &lt;TreeView.ItemContainerStyle&gt; &lt;Style TargetType="{x:Type TreeViewItem}"&gt; &lt;Setter Property="TreeViewItem.IsExpanded" Value="True"/&gt; &lt;/Style&gt; &lt;/TreeView.ItemContainerStyle&gt; &lt;TreeView.Resources&gt; &lt;HierarchicalDataTemplate DataType="{x:Type local:Root}" ItemsSource="{Binding Items}"&gt; &lt;TextBlock Text="{Binding Path=Name}" IsEnabled="True"&gt; &lt;/TextBlock&gt; &lt;/HierarchicalDataTemplate&gt; &lt;HierarchicalDataTemplate DataType="{x:Type local:Group}" ItemsSource="{Binding Items}"&gt; &lt;TextBlock Text="{Binding Path=Name}" IsEnabled="True"&gt; &lt;/TextBlock&gt; &lt;/HierarchicalDataTemplate&gt; &lt;HierarchicalDataTemplate DataType="{x:Type local:Entry}" ItemsSource="{Binding Items}"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;TextBlock Text="{Binding Path=Name}" IsEnabled="True"&gt; &lt;TextBlock.ContextMenu&gt; &lt;ContextMenu &gt; &lt;MenuItem Header="Add" Command="New"&gt; &lt;/MenuItem&gt; &lt;/ContextMenu&gt; &lt;/TextBlock.ContextMenu&gt; &lt;/TextBlock&gt; &lt;/StackPanel&gt; &lt;/HierarchicalDataTemplate&gt; &lt;DataTemplate DataType="{x:Type local:Source}" &gt; &lt;TextBlock Text="{Binding Path=Name}" /&gt; &lt;/DataTemplate&gt; &lt;/TreeView.Resources&gt; &lt;/TreeView&gt; </code></pre> <p>In UserControl.cs:</p> <pre><code>public ObservableCollection&lt;Root&gt; Roots = new ObservableCollection&lt;Root&gt;(); public UserControl6() { InitializeComponent(); //...Add new node manually TreeView.ItemsSource = Roots; } private void Add(object sender, ExecutedRoutedEventArgs e) { Entry ee = (Entry)TreeView.SelectedItem; Source s3 = new Source() { Key = 3, Name = "New Source" }; ee.Sources.Add(s3); } </code></pre> <p>When I click right button on specific node "Entry" to add a new node "Source" under Entry (call "Add" method), I add a new "Source" object under Entry successfully, but I can't see this new node on treeview. How to refresh treeview when adding/deleting node?</p>
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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.

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