XAML-Map-Control/MapControl/WPF/MapImageLayer.WPF.cs

using System;
using System.Windows;
using System.Windows.Media.Animation;

namespace MapControl;

public partial class MapImageLayer
{
    private void FadeOver()
    {
        var fadeInAnimation = new DoubleAnimation
        {
            To = 1d,
            Duration = MapBase.ImageFadeDuration
        };

        var fadeOutAnimation = new DoubleAnimation
        {
            To = 0d,
            BeginTime = MapBase.ImageFadeDuration,
            Duration = TimeSpan.Zero
        };

        Storyboard.SetTarget(fadeInAnimation, Children[1]);
        Storyboard.SetTargetProperty(fadeInAnimation, new PropertyPath(OpacityProperty));

        Storyboard.SetTarget(fadeOutAnimation, Children[0]);
        Storyboard.SetTargetProperty(fadeOutAnimation, new PropertyPath(OpacityProperty));

        var storyboard = new Storyboard();
        storyboard.Children.Add(fadeInAnimation);
        storyboard.Children.Add(fadeOutAnimation);
        storyboard.Begin();
    }
}