bouyei.Geo

        string file = "C:\\3DCity.json";// AppContext.BaseDirectory + "testfiles\\feature.geojson";//"C:\\3DCity.json";
        string content = File.ReadAllText(file, Encoding.UTF8);
        GeoJsonParser json = new GeoJsonParser(content);

        var geo = json.ToFeatures<attr, JsonMultiPolygon>();

        List<double[]> coords = new List<double[]>();
        coords.Add(new double[] { 1, 2 });
        coords.Add(new double[] { 2, 3 });

        var collection = new FeatureCollection<attr, JsonLineString>()
        {
            name = "册亨县八渡镇",
            features = new Feature<attr, JsonLineString>[] {
             new Feature<attr, JsonLineString>(){
             properties=new attr(){  name="乃言村",code="522327"},
             geometry=new JsonLineString(){
             coordinates=coords
          }
         }
        }
        };
        var str = json.ToWrite<attr, JsonLineString>(collection);

        string connstr = $"Data Source={sqlite};Version=3;Read Only=True;Pooling=False;Max Pool Size=100;";
        using (var provider = AdoProvider.CreateProvider(connstr, FactoryType.SQLite))
        {
            var rt = provider.Query<SpatiaLiteGeo>(new Parameter("select * from mian"));
            if (rt.IsSuccess() == false)
                throw new Exception(rt.Info);

            SpatiaLiteParser parser = new SpatiaLiteParser();

            foreach (var item in rt.Result)
            {
                //解析spatialite 字节
                var geo = parser.FromReader(item.GEOMETRY);

                //还原为spatialite字节
                var geo_buffer= parser.ToWriter(geo);

                Console.WriteLine(geo.ToWkt());
            }
        }

        string connstr = $"Data Source={sqlite};Version=3;Read Only=True;Pooling=False;Max Pool Size=100;";
        using (var provider = AdoProvider.CreateProvider(connstr, FactoryType.SQLite))
        {
            var rt = provider.Query<GeoPackageGeo>(new Parameter("select * from xian"));
            if (rt.IsSuccess() == false)
                throw new Exception(rt.Info);

            GeoPackageParser parser = new  GeoPackageParser();

            foreach (var item in rt.Result)
            {
                //还原为geopackage字节
                var geo = parser.FromReader(item.geom);
                Console.WriteLine(geo.ToWkt());

                //还原为geopackage字节
                var geo_buffer = parser.ToWriter(geo);

                //测试writer方法结果
                var g=parser.FromReader(geo_buffer);

                Console.WriteLine(geo.ToWkt());
            }
        }