Mvvm Light TreeView 数据绑定

    public class TreeNode
    {
        public string NodeID { get; set; }
        public string NodeName { get; set; }

        public List<TreeNode> Children { get; set; }
    }

 

<UserControl x:Class="TreeViewDemo.MainPage3"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"              xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"     mc:Ignorable="d"     d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">         <Grid.Resources>             <sdk:HierarchicalDataTemplate x:Key="ChildTemplate" ItemsSource="{Binding Path=Children}"  >                 <TextBlock FontStyle="Italic" Text="{Binding Path=NodeName}"  />             </sdk:HierarchicalDataTemplate>             <sdk:HierarchicalDataTemplate x:Key="RootTemplate"             ItemsSource="{Binding Path=Children}"             ItemTemplate="{StaticResource ChildTemplate}">                 <TextBlock Text="{Binding Path=NodeName}" FontWeight="Bold" />             </sdk:HierarchicalDataTemplate>         </Grid.Resources>         <sdk:TreeView Height="200" HorizontalAlignment="Left" Margin="12,12,0,0"  VerticalAlignment="Top" Width="120" ItemsSource="{Binding}"         ItemTemplate="{StaticResource RootTemplate}" x:Name="myTreeView"/>     </Grid> </UserControl>

 

 

using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.Collections.ObjectModel; namespace TreeViewDemo {    

    public partial class MainPage3 : UserControl     {         // Create the topics collection.         static public ObservableCollection<TreeNode> Topics =             new ObservableCollection<TreeNode>();         public MainPage3()         {             InitializeComponent();

            // Add some topics to the collection.             TreeNode One = new TreeNode() { NodeName = "1" };             One.Children = new ObservableCollection<TreeNode>();             One.Children.Add(new TreeNode { NodeName = "1-1"});                         Topics.Add(One);             myTreeView.DataContext = Topics;         }

        void myTreeView_MouseEnter(object sender, MouseEventArgs e)         {             ExpandAll(sender, e);         }

        // Method to expand all the treeview children.         private void ExpandAll(object sender, RoutedEventArgs e)         {             for (int i = 0; i < myTreeView.Items.Count; i++)             {                 TreeViewItem childItem =                     myTreeView.ItemContainerGenerator.ContainerFromItem(myTreeView.Items[i])                         as TreeViewItem;                 if (childItem != null)                     ExpandAllTreeViewItems(childItem);             }         }

        // Declare a delegate for the method to expand all children. You'll do this         // asynchronously to ensure the items are instatiated before they are expanded.         public delegate void ExpandChildren(TreeViewItem currentTreeViewItem);

        // Exapand all the children of the current treeview item.         private void ExpandAllTreeViewItems(TreeViewItem currentTreeViewItem)         {             // If the current node is not expanded, call the expansion asynchronously             // to ensure the items are instantiated before expansion.             if (!currentTreeViewItem.IsExpanded)             {                 currentTreeViewItem.IsExpanded = true;

                // Asynchronous  call to expand the children.                 currentTreeViewItem.Dispatcher.BeginInvoke(new                     ExpandChildren(ExpandAllTreeViewItems),                     new object[] { currentTreeViewItem });

                // Alternatively, you could make the call to ExpandAllTreeViewItems                 // using lambda syntax.                 // currentTreeViewItem.Dispatcher.BeginInvoke(() =>                 //   ExpandAllTreeViewItems(currentTreeViewItem));             }

            else             {                 for (int i = 0; i < currentTreeViewItem.Items.Count; i++)                 {                     TreeViewItem child = (TreeViewItem)                         currentTreeViewItem.ItemContainerGenerator.ContainerFromIndex(i);                     ExpandAllTreeViewItems(child);                 }             }         }

        // Simple business object.             } }