internal string GetGeoJson(IFeatureSet fs)
{
if (fs.Features.Count == 0)
{
return(GeoJSON.Empty);
}
//else
var type = fs.Features[0].GetGeoJsonType();
if (type == GeoJSONType.Unspecified)
{
return(string.Empty);
}
//else
GeoJSON geoJson = new GeoJSON
{
Bbox = fs.GetBbox()
};
var features = new List <FeatureGeoJson>();
//创建该feature对应的GeometryGeoJson对象
foreach (var feature in fs.Features)
{
if (feature != null)
{
if (feature.BasicGeometry == null || feature.BasicGeometry.NumPoints == 0)
{
continue;
}
//else
//获取该feature的坐标点
var coords = feature.GetCoordinates(type);
if (coords == null)
{
continue;
}
//else
//获取该feature的属性信息
var properties = feature.GetPropertieJson();
GeometryGeoJson geometryGeoJson = new GeometryGeoJson(type)
{
Coordinates = coords
};
FeatureGeoJson featureGeoJson = new FeatureGeoJson()
{
GeometryGeoJson = geometryGeoJson,
Properties = properties
};
features.Add(featureGeoJson);
}
//else continue
}
geoJson.Features = features;
return(JSON.SerializeDynamic(geoJson));
}