JSON.NET converter for serializing a C# Dictionary to a javascript Map initialization array

DictionaryToMapConverter.cs

public class DictionaryToMapConverter<TKey, TValue> : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return false;
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        // I'm only using this for writing as of now
        throw new NotImplementedException();
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        if (value == null)
        {
            writer.WriteToken(JsonToken.Null);
            return;
        }

        var values = value as IEnumerable<KeyValuePair<TKey, TValue>>;
        if (values == null)
        {
            throw new ArgumentException("value was not a dictionary");
        }

        writer.WriteToken(JsonToken.StartArray);

        foreach (var kvp in values)
        {
            writer.WriteToken(JsonToken.StartArray);

            serializer.Serialize(writer, kvp.Key);

            serializer.Serialize(writer, kvp.Value);

            writer.WriteToken(JsonToken.EndArray);
        }

        writer.WriteToken(JsonToken.EndArray);
    }
}

And here's how you'd use in a view model.

public class ViewModel 
{
    public class UserInfo 
    {
        public string Name { get; set; }
        public string ImgUrl { get; set; }
    }

    [JsonConverter(typeof(DictionaryToMapConverter<int, UserInfo>))]
    public Dictionary<int, UserInfo> UserData { get; set; }
}

When serialized it will spit out an array of key value pair arrays i.e

var data = [
    [1, { "name": "Obi-Wan Kenobi", "imgUrl": "/img/kenobi" }],
    [2, { "name": "Luke Skywalker", "imgUrl": "/img/lskywalker" }]
]

That way you can pass this array right into your map initializer

var jedis = new Map(data)