正在尝试为Microsoft.Spatial.GeographyPoint创建自定义Json反序列化程序

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Microsoft.Spatial;

public class GeographyPointConverter : JsonConverter<GeographyPoint>
{
    public override GeographyPoint ReadJson(JsonReader reader, Type objectType, GeographyPoint existingValue, bool hasExistingValue, JsonSerializer serializer)
    {
        JObject jsonObject = JObject.Load(reader);
        
        double latitude = (double)jsonObject["latitude"];
        double longitude = (double)jsonObject["longitude"];
        
        return GeographyPoint.Create(latitude, longitude);
    }

    public override void WriteJson(JsonWriter writer, GeographyPoint value, JsonSerializer serializer)
    {
        writer.WriteStartObject();
        writer.WritePropertyName("latitude");
        writer.WriteValue(value.Latitude);
        writer.WritePropertyName("longitude");
        writer.WriteValue(value.Longitude);
        writer.WriteEndObject();
    }
}

GeographyPoint point = new GeographyPoint(47.6097, -122.3331);

string json = JsonConvert.SerializeObject(point, new GeographyPointConverter());

GeographyPoint deserializedPoint = JsonConvert.DeserializeObject<GeographyPoint>(json, new GeographyPointConverter());