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Deserialize JSON array of arrays into List of Tuples using Newtonsoft

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半阙折子戏
半阙折子戏 2021-01-05 09:48

I am receiving data that looks like this from an online service provider:

{
  name: \"test data\",
  data: [
    [ \"2017-05-31\", 2388.33 ],
    [ \"2017-04
4条回答
  • 一个人的身影
    一个人的身影 (楼主)
    2021-01-05 10:43

    If anyone is interested in a more generic solution for ValueTuples

    public class TupleConverter : JsonConverter
{
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        var type = value.GetType();
        var array = new List();
        FieldInfo fieldInfo;
        var i = 1;

        while ((fieldInfo = type.GetField($"Item{i++}")) != null)
            array.Add(fieldInfo.GetValue(value));

        serializer.Serialize(writer, array);
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        var argTypes = objectType.GetGenericArguments();
        var array = serializer.Deserialize(reader);
        var items = array.Select((a, index) => a.ToObject(argTypes[index])).ToArray();

        var constructor = objectType.GetConstructor(argTypes);
        return constructor.Invoke(items);
    }

    public override bool CanConvert(Type type)
    {
        return type.Name.StartsWith("ValueTuple`");
    }
}



    Usage is as follows:
    


    var settings = new JsonSerializerSettings();
settings.Converters.Add(new TupleConverter());

var list = new List<(DateTime, double)>
{
    (DateTime.Now, 7.5)
};
var json = JsonConvert.SerializeObject(list, settings);
var result = JsonConvert.DeserializeObject(json, list.GetType(), settings);

    
    
    
             
    
                                                        
    
            
            
    
              
                
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