XAML-Map-Control/MapControl/Shared/MapPolyline.cs

using System.Collections.Generic;
#if WPF
using System.Windows;
#elif UWP
using Windows.UI.Xaml;
#elif WINUI
using Microsoft.UI.Xaml;
#endif

namespace MapControl;

/// <summary>
/// A polyline defined by a collection of Locations.
/// </summary>
public partial class MapPolyline : MapPolypoint
{
    public static readonly DependencyProperty LocationsProperty =
        DependencyPropertyHelper.Register<MapPolyline, IEnumerable<Location>>(nameof(Locations), null,
            (polyline, oldValue, newValue) => polyline.DataCollectionPropertyChanged(oldValue, newValue));

    /// <summary>
    /// Gets or sets the Locations that define the polyline points.
    /// </summary>
#if WPF
    [System.ComponentModel.TypeConverter(typeof(LocationCollectionConverter))]
#endif
    public IEnumerable<Location> Locations
    {
        get => (IEnumerable<Location>)GetValue(LocationsProperty);
        set => SetValue(LocationsProperty, value);
    }

    protected override void UpdateData()
    {
        UpdateData(Locations, false);
    }
}