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        <TextCell.ContextActions>
          <MenuItem Command="{Binding Path=BindingContext.DeleteCollectionCommand, Source={x:Reference Name=CollectionListView}}"
                    CommandParameter="{Binding .}"
                    Text="Delete" 
                    IsDestructive="True" />
        </TextCell.ContextActions>

    protected override void OnBindingContextChanged()
        base.OnBindingContextChanged();
        var deleteAction = new MenuItem { Text = "Delete", IsDestructive = true }; // red background
        deleteAction.SetBinding(MenuItem.CommandParameterProperty, new Binding("."));
        deleteAction.SetBinding(MenuItem.CommandProperty,
            new Binding("BindingContext.DeleteCommand", BindingMode.Default, null, null, null, "{x:Reference Name=CollectionBeerListView}"));
        ContextActions.Add(deleteAction);
    }

        lstView.ItemTemplate = new DataTemplate(() =>
            var cell = new DeleteGenericListItemTemplate(page);
            return cell;
        });

public class CustomCell: TextCell
        public CustomCell(Page page)
            var deleteAction = new MenuItem { Text = "Delete", IsDestructive = true }; // red background
            deleteAction.SetBinding(MenuItem.CommandParameterProperty, new Binding("."));
            deleteButton.SetBinding (MenuItem.CommandProperty, new Binding ("BindingContext.DeleteCommand", source: page));
            ContextActions.Add(deleteAction);
}

ParentContext="{Binding ., Source={RelativeSource AncestorType={x:Type local:MyViewModel}}}"

public static readonly BindableProperty ParentContextProperty = BindableProperty.Create("ParentContext", typeof(object), typeof(CustomViewCell), null, BindingMode.OneTime);
    public object ParentContext
        get { return GetValue(ParentContextProperty); }
        set { SetValue(ParentContextProperty, value); }
    }

<ViewCell.ContextActions>

问 Xamarin在ContextAction中与C#结合形成ViewCell EN

回答 2

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Stack Overflow用户