static void GeoJSON1Test(string shpPath)
{
IFeatureSet fs = FeatureSet.Open(shpPath);
var geoJson = fs.ToGeoJSON(false);
Console.WriteLine(geoJson);
var geojsonPath = Path.ChangeExtension(shpPath, ".json");
if (File.Exists(geojsonPath))
{
File.Delete(geojsonPath);
}
using var sw = new StreamWriter(geojsonPath, false);
sw.WriteLine(geoJson);
}