BoolTemplateContentControl.cs

using System.Windows.Controls;
using System.Windows;
 
namespace Vereinsmeisterschaften.Controls
{
    public class BoolTemplateContentControl : ContentControl
    {
        public bool BoolValue
        {
            get => (bool)GetValue(BoolValueProperty);
            set => SetValue(BoolValueProperty, value);
        }
        public static readonly DependencyProperty BoolValueProperty = DependencyProperty.Register(nameof(BoolValue), typeof(bool), typeof(BoolTemplateContentControl), new PropertyMetadata(false, OnAnyPropertyChanged));

        public ControlTemplate TrueTemplate
        {
            get => (ControlTemplate)GetValue(TrueTemplateProperty);
            set => SetValue(TrueTemplateProperty, value);
        }
        public static readonly DependencyProperty TrueTemplateProperty = DependencyProperty.Register(nameof(TrueTemplate), typeof(ControlTemplate), typeof(BoolTemplateContentControl), new PropertyMetadata(null, OnAnyPropertyChanged));

        public ControlTemplate FalseTemplate
        {
            get => (ControlTemplate)GetValue(FalseTemplateProperty);
            set => SetValue(FalseTemplateProperty, value);
        }
        public static readonly DependencyProperty FalseTemplateProperty = DependencyProperty.Register(nameof(FalseTemplate), typeof(ControlTemplate), typeof(BoolTemplateContentControl), new PropertyMetadata(null, OnAnyPropertyChanged));

        private static void OnAnyPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = (BoolTemplateContentControl)d;
            control.UpdateTemplate();
        }

        private void UpdateTemplate()
        {
            Template = BoolValue ? TrueTemplate : FalseTemplate;
            ApplyTemplate();
        }

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            UpdateTemplate();
        }
    }
}