问题描述

我从在线服务提供商处收到如下所示的数据:

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

{
  name: "test data",
  data: [
    [ "2017-05-31", 2388.33 ],
    [ "2017-04-30", 2358.84 ],
    [ "2017-03-31", 2366.82 ],
    [ "2017-02-28", 2329.91 ]
  ],
}       

我想将其解析成如下所示的对象:

I would like to parse it into an object that looks like this:

public class TestData
{
   public string Name;
   public List<Tuple<DateTime, double>> Data;
}

我唯一能找到的是如何将对象数组解析为元组列表，例如:Json.NET 元组的反序列化<...>在另一种类型中不起作用?

The only thing I have been able to find is how to parse an array of objects into a list of tulples, for example: Json.NET deserialization of Tuple<...> inside another type doesn't work?

有没有办法编写一个自定义转换器来处理这个问题?

Is there a way to write a custom converter that would handle this?

推荐答案

我从这里获取了通用的 TupleConverter:Json.NET 的 Tuple 反序列化<...>在另一种类型中不起作用?并制作了一个通用的 TupleListConverter.

I took the generic TupleConverter from here: Json.NET deserialization of Tuple<...> inside another type doesn't work? And made a generic TupleListConverter.

用法:

public class TestData
{
    public string Name;
    [Newtonsoft.Json.JsonConverter(typeof(TupleListConverter<DateTime, double>))]
    public List<Tuple<DateTime, double>> Data;
}

public void Test(string json)
{
    var testData = JsonConvert.DeserializeObject<TestData>(json);
    foreach (var tuple in testData.data)
    {
        var dateTime = tuple.Item1;
        var price = tuple.Item2;
        ... do something...
    }
}

转换器:

public class TupleListConverter<U, V> : Newtonsoft.Json.JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return typeof(Tuple<U, V>) == objectType;
    }

    public override object ReadJson(
        Newtonsoft.Json.JsonReader reader,
        Type objectType,
        object existingValue,
        Newtonsoft.Json.JsonSerializer serializer)
    {
        if (reader.TokenType == Newtonsoft.Json.JsonToken.Null)
            return null;

        var jArray = Newtonsoft.Json.Linq.JArray.Load(reader);
        var target = new List<Tuple<U, V>>();

        foreach (var childJArray in jArray.Children<Newtonsoft.Json.Linq.JArray>())
        {
            var tuple = new Tuple<U, V>(
                childJArray[0].ToObject<U>(),
                childJArray[1].ToObject<V>()
            );
            target.Add(tuple);
        }

        return target;
    }

    public override void WriteJson(Newtonsoft.Json.JsonWriter writer, object value, Newtonsoft.Json.JsonSerializer serializer)
    {
        serializer.Serialize(writer, value);
    }
}

这篇关于使用 Newtonsoft 将 JSON 数组反序列化为元组列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！