[C#] Serialize JSON with circular references

json_serialize_circular

            var serializerSettings = new JsonSerializerSettings
            {
                PreserveReferencesHandling = PreserveReferencesHandling.Objects,
                ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
            };
            string json = JsonConvert.SerializeObject(afectados, Formatting.Indented, serializerSettings);
            return Content(JsonConvert.SerializeObject(afectados, Formatting.Indented, serializerSettings));