如何检索在WPF-treeview中选择的项?我想在XAML中这样做,因为我想绑定它。

您可能认为它是SelectedItem,但显然它不存在是只读的,因此不可用。

这就是我想做的:

<TreeView ItemsSource="{Binding Path=Model.Clusters}" 
            ItemTemplate="{StaticResource ClusterTemplate}"
            SelectedItem="{Binding Path=Model.SelectedCluster}" />

我想将SelectedItem绑定到我的Model上的一个属性。

但这给了我一个错误:

“SelectedItem”属性是只读的,不能从标记中设置。

编辑: 这就是我解决这个问题的方法:

<TreeView
          ItemsSource="{Binding Path=Model.Clusters}" 
          ItemTemplate="{StaticResource HoofdCLusterTemplate}"
          SelectedItemChanged="TreeView_OnSelectedItemChanged" />

在我的xaml的代码背后文件:

private void TreeView_OnSelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
    Model.SelectedCluster = (Cluster)e.NewValue;
}

当前回答

我意识到这已经有一段时间了,但FWIW我正在使用Telerik的RadTreeView, SelectedItem似乎工作得很好-要么问题已经修复,要么Telerik已经为我们工作了。

其他回答

我建议对Steve Greatrex提供的行为进行补充。他的行为并不反映来自源的更改,因为它可能不是TreeViewItems的集合。 所以这是一个在树中找到TreeViewItem的问题,它的数据上下文是来自源的selectedValue。 TreeView有一个名为“ItemsHost”的受保护属性,它包含TreeViewItem集合。我们可以通过反射获得它,并遍历树搜索所选项目。

private static void OnSelectedItemChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        var behavior = sender as BindableSelectedItemBehaviour;

        if (behavior == null) return;

        var tree = behavior.AssociatedObject;

        if (tree == null) return;

        if (e.NewValue == null) 
            foreach (var item in tree.Items.OfType<TreeViewItem>())
                item.SetValue(TreeViewItem.IsSelectedProperty, false);

        var treeViewItem = e.NewValue as TreeViewItem; 
        if (treeViewItem != null)
        {
            treeViewItem.SetValue(TreeViewItem.IsSelectedProperty, true);
        }
        else
        {
            var itemsHostProperty = tree.GetType().GetProperty("ItemsHost", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);

            if (itemsHostProperty == null) return;

            var itemsHost = itemsHostProperty.GetValue(tree, null) as Panel;

            if (itemsHost == null) return;

            foreach (var item in itemsHost.Children.OfType<TreeViewItem>())
                if (WalkTreeViewItem(item, e.NewValue)) break;
        }
    }

    public static bool WalkTreeViewItem(TreeViewItem treeViewItem, object selectedValue) {
        if (treeViewItem.DataContext == selectedValue)
        {
            treeViewItem.SetValue(TreeViewItem.IsSelectedProperty, true);
            treeViewItem.Focus();
            return true;
        }

        foreach (var item in treeViewItem.Items.OfType<TreeViewItem>())
            if (WalkTreeViewItem(item, selectedValue)) return true;

        return false;
    }

这种方式的行为适用于双向绑定。或者,也可以将ItemsHost获取移动到Behavior的OnAttached方法,从而节省每次绑定更新时使用反射的开销。

当点击某些项目列表时,你会在“选定”属性中获得数据。 视图模型:

public class ShellViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    protected void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }

    private ObservableCollection<Books> _books;

    private List<Books> bookList = new List<Books>();

    public ObservableCollection<Books> Books
    {
        get { return _books; }
        set { _books = value; NotifyPropertyChanged("Books"); }
    }

    private Books books;

    public Books Selected
    {
        get { return books; }
        set { books = value; }
    }


    public ShellViewModel()
    {
        bookList = new List<Books>()
        {
            new Books{BookName = "Harry Poter",Price ="15$"},
            new Books{BookName = "Harry Poter 2 ",Price ="14.95$"},
            new Books{BookName = "Harry Poter 3",Price ="18.50$"},
            new Books{BookName = "Harry Poter 4",Price ="32.90$"},
        };

        Books = new ObservableCollection<Books>(bookList);
    }
}

public class Books
{
    public string BookName { get; set; }
    public string Price { get; set; }
}

XAML:

 <ListView x:Name="lst" Grid.Row="2" ItemsSource="{Binding Books}" SelectedItem="{Binding Selected}">
        <ListView.View>
            <GridView >
                <GridViewColumn Header="Name" DisplayMemberBinding="{Binding BookName}"  />
                <GridViewColumn Header="Price" Width="100" DisplayMemberBinding="{Binding Price}"/>
            </GridView>
        </ListView.View>
    </ListView>

还有一种方法可以在不使用Interaction.Behaviors的情况下创建XAML可绑定SelectedItem属性。

public static class BindableSelectedItemHelper
{
    #region Properties

    public static readonly DependencyProperty SelectedItemProperty = DependencyProperty.RegisterAttached("SelectedItem", typeof(object), typeof(BindableSelectedItemHelper),
        new FrameworkPropertyMetadata(null, OnSelectedItemPropertyChanged));

    public static readonly DependencyProperty AttachProperty = DependencyProperty.RegisterAttached("Attach", typeof(bool), typeof(BindableSelectedItemHelper), new PropertyMetadata(false, Attach));

    private static readonly DependencyProperty IsUpdatingProperty = DependencyProperty.RegisterAttached("IsUpdating", typeof(bool), typeof(BindableSelectedItemHelper));

    #endregion

    #region Implementation

    public static void SetAttach(DependencyObject dp, bool value)
    {
        dp.SetValue(AttachProperty, value);
    }

    public static bool GetAttach(DependencyObject dp)
    {
        return (bool)dp.GetValue(AttachProperty);
    }

    public static string GetSelectedItem(DependencyObject dp)
    {
        return (string)dp.GetValue(SelectedItemProperty);
    }

    public static void SetSelectedItem(DependencyObject dp, object value)
    {
        dp.SetValue(SelectedItemProperty, value);
    }

    private static bool GetIsUpdating(DependencyObject dp)
    {
        return (bool)dp.GetValue(IsUpdatingProperty);
    }

    private static void SetIsUpdating(DependencyObject dp, bool value)
    {
        dp.SetValue(IsUpdatingProperty, value);
    }

    private static void Attach(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        TreeListView treeListView = sender as TreeListView;
        if (treeListView != null)
        {
            if ((bool)e.OldValue)
                treeListView.SelectedItemChanged -= SelectedItemChanged;

            if ((bool)e.NewValue)
                treeListView.SelectedItemChanged += SelectedItemChanged;
        }
    }

    private static void OnSelectedItemPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        TreeListView treeListView = sender as TreeListView;
        if (treeListView != null)
        {
            treeListView.SelectedItemChanged -= SelectedItemChanged;

            if (!(bool)GetIsUpdating(treeListView))
            {
                foreach (TreeViewItem item in treeListView.Items)
                {
                    if (item == e.NewValue)
                    {
                        item.IsSelected = true;
                        break;
                    }
                    else
                       item.IsSelected = false;                        
                }
            }

            treeListView.SelectedItemChanged += SelectedItemChanged;
        }
    }

    private static void SelectedItemChanged(object sender, RoutedEventArgs e)
    {
        TreeListView treeListView = sender as TreeListView;
        if (treeListView != null)
        {
            SetIsUpdating(treeListView, true);
            SetSelectedItem(treeListView, treeListView.SelectedItem);
            SetIsUpdating(treeListView, false);
        }
    }
    #endregion
}

然后你可以在你的XAML中使用它:

<TreeView  helper:BindableSelectedItemHelper.Attach="True" 
           helper:BindableSelectedItemHelper.SelectedItem="{Binding SelectedItem, Mode=TwoWay}">

我知道这个帖子已经10年了,但问题仍然存在....

最初的问题是“检索”所选项目。我还需要在我的视图模型中“获取”选定的项目(而不是设置它)。在这个线程中的所有答案中,“Wes”的答案是唯一一个以不同的方式解决问题的答案:如果你可以使用“Selected Item”作为数据绑定的目标,那么就使用它作为数据绑定的源。Wes对另一个视图属性做过,我将对viewmodel属性做

我们需要两样东西:

在视图模型中创建一个依赖属性(在我的情况下,类型为'MyObject',因为我的树视图绑定到'MyObject'类型的对象) 从Treeview绑定。SelectedItem属性在视图的构造函数中(是的,这是后面的代码,但很可能你也会init你的datacontext)

Viewmodel:

public static readonly DependencyProperty SelectedTreeViewItemProperty = DependencyProperty.Register("SelectedTreeViewItem", typeof(MyObject), typeof(MyViewModel), new PropertyMetadata(OnSelectedTreeViewItemChanged));

    private static void OnSelectedTreeViewItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        (d as MyViewModel).OnSelectedTreeViewItemChanged(e);
    }

    private void OnSelectedTreeViewItemChanged(DependencyPropertyChangedEventArgs e)
    {
        //do your stuff here
    }

    public MyObject SelectedWorkOrderTreeViewItem
    {
        get { return (MyObject)GetValue(SelectedTreeViewItemProperty); }
        set { SetValue(SelectedTreeViewItemProperty, value); }
    }

构造函数:

Binding binding = new Binding("SelectedItem")
        {
            Source = treeView, //name of tree view in xaml
            Mode = BindingMode.OneWay
        };

        BindingOperations.SetBinding(DataContext, MyViewModel.SelectedTreeViewItemProperty, binding);

这可以以一种“更好”的方式完成,只使用绑定和GalaSoft MVVM Light库的EventToCommand。在您的VM中添加一个命令,当所选项目发生变化时将调用该命令,并初始化该命令以执行任何必要的操作。在这个例子中,我使用了一个RelayCommand,只设置SelectedCluster属性。

public class ViewModel
{
    public ViewModel()
    {
        SelectedClusterChanged = new RelayCommand<Cluster>( c => SelectedCluster = c );
    }

    public RelayCommand<Cluster> SelectedClusterChanged { get; private set; } 

    public Cluster SelectedCluster { get; private set; }
}

然后在xaml中添加EventToCommand行为。使用混合非常简单。

<TreeView
      x:Name="lstClusters"
      ItemsSource="{Binding Path=Model.Clusters}" 
      ItemTemplate="{StaticResource HoofdCLusterTemplate}">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="SelectedItemChanged">
            <GalaSoft_MvvmLight_Command:EventToCommand Command="{Binding SelectedClusterChanged}" CommandParameter="{Binding ElementName=lstClusters,Path=SelectedValue}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</TreeView>