ListView自定义ViewCell中带有Tap GestureRecognitor的标签不工作

我有一个带有自定义

ViewCell

的listview，它有一个带有

TapGestureRecognitor

的

标签，我想在父绑定上下文中激发该标签。此视图单元绑定到“某物”视图模型，某物视图模型是某物更大视图模型的一部分

public class CustomViewCell : ViewCell 
{

    #region bindable properties

    public static readonly BindableProperty ToggleCommandProperty =
        BindableProperty.Create(nameof(ToggleCommand), typeof(Command), typeof(CustomViewCell), null);

    public ICommand ToggleCommand
    {
        get { return (ICommand)GetValue(ToggleCommandProperty); }
        set { SetValue(ToggleProperty, value); }
    }

    #endregion


    public CustomViewCell
    {
        Grid grid = new Grid
        {
            ColumnSpacing = 3,
            RowSpacing = 0
        };

        //..........
        // adding other elements here
        //..........

        var addLabel = new Label
        {
            Text = "+ Add",
            FontSize = 11,
            WidthRequest = 40,
            Margin = new Thickness(0, 0, 0, 5),
            HorizontalOptions = LayoutOptions.FillAndExpand,
            VerticalOptions = LayoutOptions.FillAndExpand,
            VerticalTextAlignment = TextAlignment.Center,
            HorizontalTextAlignment = TextAlignment.Center
        };

        addLabel.GestureRecognizers.Add(new TapGestureRecognizer
        {
            Command = ToggleCommand,
            CommandParameter = BindingContext
        });

        grid.Children.Add(addLabel, 7, 1);
        Grid.SetRowSpan(addLabel, 2);

        View = grid;
    }
}

SomethingBiggerViewModel
，如果点击标签，则应执行命令：

public class SomethingBiggerViewModel 
{
     public ICommand ToggleCommand { get; set; }

     public SomethingBiggerViewModel() 
     {
          ToggleCommand = new Command<SomethingViewModel>(async (something) => await ExecuteToggleCommand(something));
     }

    async Task ExecuteToggleCommand(SomethingViewModel something)
    {
        await _pageService.DisplayAlert("title", "item clicked " + something.Name, "Cancel");
    }
}

公共类SomethingBiggerViewModel
{
公共ICommand ToggleCommand{get；set；}
公共SomethingBiggerViewModel（）
{
ToggleCommand=new命令（异步（某物）=>await-ExecuteToggleCommand（某物））；
}
异步任务ExecuteToggleCommand（SomethingViewModel something）
{
wait_pageService.DisplayAlert（“标题”，“点击项目”+某物.Name，“取消”）；
}
}

在页面中：

<ListView Grid.Row="3" 
            VerticalOptions="FillAndExpand"
            CachingStrategy="RecycleElement"
            x:Name="linesListView" 
            RowHeight="{Binding LineRowHeight}"
            ItemsSource="{Binding Lines}"
            SeparatorColor="#bfbfbf">
    <ListView.ItemTemplate>
        <DataTemplate>
            <views:CustomViewCell ToggleCommand="{Binding Source={x:Reference ThePage}, Path=BindingContext.ToggleCommand}" />
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>



上面的代码可以编译，但当我运行它时，它会给我一个错误“但它仍在工作”，即“SomethingViewModel”没有“ToggleCommand”

如何执行此操作？
能否显示完整的viewmodel和axml
x：在此处引用页面
是否要绑定到页面的视图模型？@LeoZhu MSFT我没有绑定到父视图模型（
somethingbiger
）。
ToggleCommand
在
SomethingBiggerViewModel
中定义，您应该绑定
SomethingBiggerViewModel