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

using System.Windows;
using System.Windows.Media;
using System.Windows.Shapes;

namespace MapControl;

public partial class MapPath : Shape
{
    public static readonly DependencyProperty DataProperty =
        DependencyPropertyHelper.AddOwner<MapPath, Geometry>(Path.DataProperty,
            (path, oldValue, newValue) => path.DataPropertyChanged(oldValue, newValue));

    public Geometry Data
    {
        get => (Geometry)GetValue(DataProperty);
        set => SetValue(DataProperty, value);
    }

    protected override Geometry DefiningGeometry => Data;

    private void DataPropertyChanged(Geometry oldValue, Geometry newValue)
    {
        // Check if Data is actually a new Geometry.
        //
        if (newValue != null && !ReferenceEquals(newValue, oldValue))
        {
            if (newValue.IsFrozen)
            {
                Data = newValue.Clone(); // DataPropertyChanged called again
            }
            else
            {
                UpdateData();
            }
        }
    }
}