gistfile1.txt

using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Microsoft.Xaml.Interactivity;

namespace Tetraptera.Views.Behaviors
{
    public class SelectTemplateBehavior : DependencyObject, IBehavior
    {
        public void Attach(DependencyObject associatedObject)
        {
            if (associatedObject is ListView list)
            {
                list.ChoosingItemContainer += OnChoosingItemContainer;
            }
        }

        public void Detach()
        {
            if (AssociatedObject is ListView list)
            {
                list.ChoosingItemContainer -= OnChoosingItemContainer;
            }
        }

        private void OnChoosingItemContainer(ListViewBase sender, ChoosingItemContainerEventArgs args)
        {
            var template = Selector.SelectTemplate(args.Item);
            if (args.ItemContainer != null && args.ItemContainer.ContentTemplate != template)
            {
                args.ItemContainer.ContentTemplate = template;
            }
            if (args.ItemContainer == null)
            {
                args.ItemContainer = new ListViewItem
                {
                    Style = sender.ItemContainerStyle,
                    ContentTemplate = template,
                };
            }
            args.IsContainerPrepared = true;
        }

        public DependencyObject AssociatedObject { get; }

        public DataTemplateSelector Selector { get; set; }
    }
}