wpf - Galasoft MVVM-Light 和 treeview 事件

Question

我尝试将 galasoft mvvm-light 框架与我的 wpf treeviev 控件一起使用，但在相应的视图模型中不会调用任何命令方法。

视图模型：

public class TreeViewViewModel : WorkspaceViewModel
{
    private List<TreeItemViewModel> _items;
    public List<TreeItemViewModel> Items { get { return _items; } set { _items = value; } }
    public RelayCommand<RoutedPropertyChangedEventArgs<object>> SelectedItemChangedCommand { get; private set; }
    public RelayCommand<EventArgs> MouseDoubleClickCommand { get; private set; }

    public TreeViewViewModel()
    {
        SelectedItemChangedCommand = new RelayCommand<RoutedPropertyChangedEventArgs<object>>(e => OnSelectedItemChanged(e));
    }

    void OnSelectedItemChanged(RoutedPropertyChangedEventArgs<object> e)
    {
        var xy = e;
    }
}

看法：

<TreeView ItemsSource="{Binding Items}" Grid.Row="1" x:Name="trvTemplate">
     <TreeView.ItemContainerStyle>
            <Style TargetType="{x:Type TreeViewItem}">
                <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
                <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
                <Setter Property="FontWeight" Value="Normal" />
                <Style.Triggers>
                    <Trigger Property="IsSelected" Value="True">
                        <Setter Property="FontWeight" Value="Bold" />
                    </Trigger>
                </Style.Triggers>
            </Style>
        </TreeView.ItemContainerStyle>
        <TreeView.ItemTemplate>
            <HierarchicalDataTemplate ItemsSource="{Binding Children}">
                <TextBlock Text="{Binding Text}" />
            </HierarchicalDataTemplate>
        </TreeView.ItemTemplate>
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="SelectedItemChanged">
                <cmd:EventToCommand Command="{Binding SelectedItemChangedCommand, Mode=OneWay}" PassEventArgsToCommand="True" />
            </i:EventTrigger>
            <i:EventTrigger EventName="MouseLeftButtonDown">
                <cmd:EventToCommand Command="{Binding MouseDoubleClickCommand}" PassEventArgsToCommand="True" />
            </i:EventTrigger>
        </i:Interaction.Triggers>
    </TreeView>

我已经阅读了一些博客，它应该可以工作，但我知道不是调用了命令。如果有更好或更简单的方法将 wpf treeview 与 mvvm 模式结合起来，请给我相关信息。