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);
}
}
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