将ContextMenu命令绑定到父视图模型RelayCommand

我有一个TvShowsViewModel（1），它包含TvShowViewModel s（2）的ObservableCollection。TvShowViewModel包含SeasonViewModels（3）的ObservableCollection。

我有一个TreeView，它具有TvShowsViewModel（1）作为DataContext。其中TreeView的ItemSource与TvShowViewModels的ObservableCollection结合（2）。

TreeView指定HierarchicalDataTemplate，其结合到SeasonViewModels（3）的ObservableCollection。

CCD_ 18包含一个CCD_。

现在，ContextMenu包含一个Command，我想将其绑定到TvShowsViewModel（1）中的RelayCommand。

我尝试了各种类型的RelativeSource绑定，但都没有找到解决方案。我应该如何指定绑定？

TvShowsViewModel（1）

public class TvShowsViewModel : ViewModelBase
{
    public RelayCommand ExcludeSeasonCommand { get; private set; }
    public ObservableCollection<TvShowViewModel> TvShows { get; private set; }
    public TvShowsViewModel(ITvShowsLibrary tvShowsLibrary)
    {
        TvShows = new ObservableCollection<TvShowViewModel>();
        ExcludeSeasonCommand = new RelayCommand(ExcludeSeasonCommandOnExecute, ExcludeSeasonCommandOnCanExecute);
    // Left out irrelevant code
    }
}

TvShowViewModel（2）

public class TvShowViewModel : ViewModelBase, IFolderOnDisk
{
    public ObservableCollection<SeasonViewModel> Seasons
    {
        get { return _seasons; }
    }
    // Left out irrelevant code
}

SeasonViewModel（3）

public class SeasonViewModel : ViewModelBase, IFolderOnDisk
{
    // Left out irrelevant code
}

剥离的用户控件（TreeView）

<!-- Again, left out a lot of irrelevant parts -->
<TreeView ItemsSource="{Binding TvShows}">
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate DataType="tvShows:TvShowViewModel" ItemsSource="{Binding Seasons}">
            <TextBlock Text="{Binding Name}" />
            <HierarchicalDataTemplate.ItemTemplate>
                <HierarchicalDataTemplate>
                    <TextBlock Text="{Binding Name}">
                        <TextBlock.ContextMenu>
                            <ContextMenu>
                                <MenuItem
                                    Header="Exclude season"
                     <!-- This is where I need your help, how should I configure the binding? -->
                                    Command="{Binding Path=DataContext.ExcludeSeasonCommand, RelativeSource={RelativeSource AncestorType=TreeView}}" />
                            </ContextMenu>
                        </TextBlock.ContextMenu>
                    </TextBlock>
                </HierarchicalDataTemplate>
            </HierarchicalDataTemplate.ItemTemplate>
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

绑定，我无法理解

<MenuItem
    Header="Exclude season"
    Command="{Binding DataContext.ExcludeSeasonCommand, Source={x:Reference _tvShowsTreeView}}" />