XAML DataTemplateSelector Example

ThingTemplateSelector.cs

using System;
using System.Collections.Generic;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace DataTemplates
{
    public class ThingTemplateSelector : DataTemplateSelector
    {
        private readonly Dictionary<Type, Func<DataTemplate>> TemplatesByType;
        
        public DataTemplate RedThingTemplate { get; set; }
        public DataTemplate BlueThingTemplate { get; set; }
        
        public ThingTemplateSelector()
        {
            TemplatesByType = new Dictionary<Type, Func<DataTemplate>>
            {
              { typeof(RedThing), () => RedThingTemplate },
              { typeof(BlueThing), () => BlueThingTemplate }
            };
        }
        
        protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
        {
            DataTemplate dataTemplate;
            if (TemplatesByType.TryGetValue(item?.GetType(), out dataTemplate))
              return dataTemplate;

            return base.SelectTemplateCore(item, container);
        }
    }
}