我意识到这已经有了一个被接受的答案，但我把这些放在一起来解决问题。它使用了与Delta的解决方案类似的思想，但不需要子类化TreeView:

public class BindableSelectedItemBehavior : Behavior<TreeView>
{
    #region SelectedItem Property

    public object SelectedItem
    {
        get { return (object)GetValue(SelectedItemProperty); }
        set { SetValue(SelectedItemProperty, value); }
    }

    public static readonly DependencyProperty SelectedItemProperty =
        DependencyProperty.Register("SelectedItem", typeof(object), typeof(BindableSelectedItemBehavior), new UIPropertyMetadata(null, OnSelectedItemChanged));

    private static void OnSelectedItemChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        var item = e.NewValue as TreeViewItem;
        if (item != null)
        {
            item.SetValue(TreeViewItem.IsSelectedProperty, true);
        }
    }

    #endregion

    protected override void OnAttached()
    {
        base.OnAttached();

        this.AssociatedObject.SelectedItemChanged += OnTreeViewSelectedItemChanged;
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();

        if (this.AssociatedObject != null)
        {
            this.AssociatedObject.SelectedItemChanged -= OnTreeViewSelectedItemChanged;
        }
    }

    private void OnTreeViewSelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
    {
        this.SelectedItem = e.NewValue;
    }
}

然后你可以在你的XAML中使用它:

<TreeView>
    <e:Interaction.Behaviors>
        <behaviours:BindableSelectedItemBehavior SelectedItem="{Binding SelectedItem, Mode=TwoWay}" />
    </e:Interaction.Behaviors>
</TreeView>

希望它能帮助到一些人!

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>

走吧

．.． 是一个更好的答案，但没有提到一种在ViewModel中获取/设置SelectedItem的方法。

添加一个IsSelected布尔属性到ItemViewModel，并在TreeViewItem的样式设置器中绑定到它。 在ViewModel中添加SelectedItem属性，作为TreeView的DataContext。这是上面解决方案中缺少的部分。

    ' ItemVM...
    Public Property IsSelected As Boolean
        Get
            Return _func.SelectedNode Is Me
        End Get
        Set(value As Boolean)
            If IsSelected  value Then
                _func.SelectedNode = If(value, Me, Nothing)
            End If
            RaisePropertyChange()
        End Set
    End Property
    ' TreeVM...
    Public Property SelectedItem As ItemVM
        Get
            Return _selectedItem
        End Get
        Set(value As ItemVM)
            If _selectedItem Is value Then
                Return
            End If
            Dim prev = _selectedItem
            _selectedItem = value
            If prev IsNot Nothing Then
                prev.IsSelected = False
            End If
            If _selectedItem IsNot Nothing Then
                _selectedItem.IsSelected = True
            End If
        End Set
    End Property

<TreeView ItemsSource="{Binding Path=TreeVM}" 
          BorderBrush="Transparent">
    <TreeView.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
            <Setter Property="IsExpanded" Value="{Binding IsExpanded}"/>
            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}"/>
        </Style>
    </TreeView.ItemContainerStyle>
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding Children}">
            <TextBlock Text="{Binding Name}"/>
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

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>

我试过了这道题的所有解。没有人能完全解决我的问题。所以我认为最好使用这样的继承类与重定义属性SelectedItem。如果你从GUI中选择tree element并在代码中设置此属性值，它将完美地工作

public class TreeViewEx : TreeView
{
    public TreeViewEx()
    {
        this.SelectedItemChanged += new RoutedPropertyChangedEventHandler<object>(TreeViewEx_SelectedItemChanged);
    }

    void TreeViewEx_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
    {
        this.SelectedItem = e.NewValue;
    }

    #region SelectedItem

    /// <summary>
    /// Gets or Sets the SelectedItem possible Value of the TreeViewItem object.
    /// </summary>
    public new object SelectedItem
    {
        get { return this.GetValue(TreeViewEx.SelectedItemProperty); }
        set { this.SetValue(TreeViewEx.SelectedItemProperty, value); }
    }

    // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...
    public new static readonly DependencyProperty SelectedItemProperty =
        DependencyProperty.Register("SelectedItem", typeof(object), typeof(TreeViewEx),
        new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, SelectedItemProperty_Changed));

    static void SelectedItemProperty_Changed(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
    {
        TreeViewEx targetObject = dependencyObject as TreeViewEx;
        if (targetObject != null)
        {
            TreeViewItem tvi = targetObject.FindItemNode(targetObject.SelectedItem) as TreeViewItem;
            if (tvi != null)
                tvi.IsSelected = true;
        }
    }                                               
    #endregion SelectedItem   

    public TreeViewItem FindItemNode(object item)
    {
        TreeViewItem node = null;
        foreach (object data in this.Items)
        {
            node = this.ItemContainerGenerator.ContainerFromItem(data) as TreeViewItem;
            if (node != null)
            {
                if (data == item)
                    break;
                node = FindItemNodeInChildren(node, item);
                if (node != null)
                    break;
            }
        }
        return node;
    }

    protected TreeViewItem FindItemNodeInChildren(TreeViewItem parent, object item)
    {
        TreeViewItem node = null;
        bool isExpanded = parent.IsExpanded;
        if (!isExpanded) //Can't find child container unless the parent node is Expanded once
        {
            parent.IsExpanded = true;
            parent.UpdateLayout();
        }
        foreach (object data in parent.Items)
        {
            node = parent.ItemContainerGenerator.ContainerFromItem(data) as TreeViewItem;
            if (data == item && node != null)
                break;
            node = FindItemNodeInChildren(node, item);
            if (node != null)
                break;
        }
        if (node == null && parent.IsExpanded != isExpanded)
            parent.IsExpanded = isExpanded;
        if (node != null)
            parent.IsExpanded = true;
        return node;
    }
} 

我偶然发现了这一页，寻找与原作者相同的答案，并证明了总是有不止一种方法来做这件事，解决方案对我来说甚至比这里提供的答案更容易，所以我想我不妨添加到堆中。

绑定的动机是保持良好& MVVM。ViewModel的可能用法是有一个带有名称的属性，例如“CurrentThingy”，而在其他地方，其他东西上的DataContext被绑定到“CurrentThingy”。

而不是通过额外的步骤(例如:自定义行为，第三方控制)来支持从TreeView到我的模型的良好绑定，然后从其他东西到我的模型，我的解决方案是使用简单的元素绑定其他东西到TreeView。SelectedItem，而不是将其他东西绑定到ViewModel，从而跳过所需的额外工作。

XAML:

<TreeView x:Name="myTreeView" ItemsSource="{Binding MyThingyCollection}">
.... stuff
</TreeView>

<!-- then.. somewhere else where I want to see the currently selected TreeView item: -->

<local:MyThingyDetailsView 
       DataContext="{Binding ElementName=myTreeView, Path=SelectedItem}" />

当然，这对于读取当前选择的项目很好，但不能设置它，这是我所需要的。