GMap.NET C#，没有谷歌距离矩阵Api的两点之间的距离

using System;
using System.Device.Location;

public class DistanceCalculator
{
    public static double CalculateDistance(double lat1, double lon1, double lat2, double lon2)
    {
        var coord1 = new GeoCoordinate(lat1, lon1);
        var coord2 = new GeoCoordinate(lat2, lon2);
        return coord1.GetDistanceTo(coord2);
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        double lat1 = 39.9087; // 第一个地点的纬度
        double lon1 = 116.3975; // 第一个地点的经度
        double lat2 = 31.2244; // 第二个地点的纬度
        double lon2 = 121.4768; // 第二个地点的经度

        double distance = DistanceCalculator.CalculateDistance(lat1, lon1, lat2, lon2);
        Console.WriteLine("两点之间的距离为：" + distance + "米");
    }
}