Wino-Mail/Wino.Mail/Selectors/MailItemDisplaySelector.cs

using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Wino.Mail.ViewModels.Data;

namespace Wino.Selectors;

public partial class MailItemDisplaySelector : DataTemplateSelector
{
    public DataTemplate SingleMailItemTemplate { get; set; }
    public DataTemplate ThreadMailItemTemplate { get; set; }

    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
    {
        if (item is MailItemViewModel)
            return SingleMailItemTemplate;
        else if (item is ThreadMailItemViewModel)
            return ThreadMailItemTemplate;

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