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            OracleEntityProviderConfig config = OracleEntityProviderConfig.Instance;
            config.SpatialOptions.SpatialServiceType = SpatialServiceType.SharpMap;

            using (DOTNETEntities entities = new DOTNETEntities())
            {
                var q = from c1 in entities.CITIES
                        from c2 in entities.CITIES
                        where c1.ID == 13 && c2.ID == 14
                        select new
                            {
                                C1 = c1.NAME,
                                C2 = c2.NAME,
                                Distance = c1.GEOMETRY.Distance(c2.GEOMETRY)
                            };

                foreach (var source in q.ToArray())
                {
                    Console.WriteLine(source.Distance); // this works
                }

                CITY cc1 = entities.CITIES.First(c => c.ID == 13); // Geometrytype '' is not supported.

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  Geometrytype '' is not supported. 
at SharpMap.Converters.WellKnownText.GeometryFromWKT.ReadGeometryTaggedText(WktStreamTokenizer tokenizer)
   at SharpMap.Converters.WellKnownText.GeometryFromWKT.Parse(TextReader reader)
   at SharpMap.Converters.WellKnownText.GeometryFromWKT.Parse(String wellKnownText)
   at Devart.Common.Entity.dx.a(Int32 A_0)

Code: Select all

            OracleEntityProviderConfig config = OracleEntityProviderConfig.Instance;
            config.SpatialOptions.SpatialServiceType = SpatialServiceType.SharpMap;

            using (DOTNETEntities entities = new DOTNETEntities())
            {
                CITY city = entities.CITIES.First();