C＃参考早期的JSON元素-Newtonsoft

Question

I'm serializing an object which has a List<X> and a Dictionary<X, Y> .

The List<X> is serializing without any issues. To serialize the dictionary however, I've implemented a custom converter.

class XYDictionaryConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return typeof(Dictionary<X, Y>).IsAssignableFrom(objectType);
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        JObject jObject = JObject.Load(reader);

        Dictionary<X, Y> dictionary = new Dictionary<X, Y>();

        foreach (JProperty property in jObject.Properties())
        {
            X key = //Get Y using property.Name

            if (key != null)
            {
                dictionary.Add(key, property.Value.ToObject<Y>());
            }
        }

        return dictionary;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        IDictionary<X, Y> dictionary = (IDictionary<X, Y>)value;

        JObject jObject = new JObject();

        foreach (var kvp in dictionary)
        {
            jObject.Add(kvp.Key.name, kvp.Value == null ? null : JToken.FromObject(kvp.Value));
        }

        jObject.WriteTo(writer);
    }
}

The problem is that I have no idea how to reference the List<X> within the converter. Assuming the JSON is deserialized linearly, the List<X> should have been deserialized by this point, but as the DeserializeObject() method hasn't finished yet, I don't have any reference to it.

How would I go about solving this?

Answer 1

My solution in the end was to change the way I stored 'X'. Instead of storing the keys of the dictionary as keys in the json, I stored each keyvaluepair as an array item.

Each item then is: { "key": { "$ref" : 5 } "value": { "$ref" : 10 } }

For writing, this was just a matter of using JArray , JObject and JToken.FromObject (making sure to pass in the serializer.

For reading, jObject.GetValue("Key").ToObject<X>(serializer) worked brilliantly.

Hope this helps someone.