关于Geometry转GeoJson

FeatureCollection features = new FeatureCollection(item.Geom);
string Geo = Regex.Replace(features.Serialize(prettyPrint: true), @"\s", "");

1                 var list = from a in context.aaa
2                            select new
3                            {
4                                ...
5                                Geom = SqlSpatialFunctions.MakeValid(a.geom),
6                                ...
7                            };