sharee.bike-App/Meinkonrad/TINK/View/ListViewAttachedBehavior.cs

using System.Windows.Input;
using Xamarin.Forms;

namespace TINK.View
{
    public static class ListViewAttachedBehavior
    {
        public static readonly BindableProperty CommandProperty =
            BindableProperty.CreateAttached(
                "Command",
                typeof(ICommand),
                typeof(ListViewAttachedBehavior),
                null,
                propertyChanged: OnCommandChanged);

        static void OnCommandChanged(BindableObject view, object oldValue, object newValue)
        {
            var entry = view as ListView;
            if (entry == null)
                return;

            entry.ItemTapped += (sender, e) =>
            {
                var command = (newValue as ICommand);
                if (command == null)
                    return;

                if (command.CanExecute(e.Item))
                {
                    command.Execute(e.Item);
                }
            };
        }
    }
}