无法将JSON数据反序列化为List <T>

问题描述

如果 candles.json 不存在或存在，并且第一个元素的开始日期和最后一个元素的结束日期不同，它将把数据序列化为List<IBinanceKline>并创建 candles.json 。如果 candles.json 存在，则应读取它并将数据反序列化为List<IBinanceKline>。目前，它无法DeserializeObject<List<IBinanceKline>>并显示以下错误消息：

Newtonsoft.Json.JsonSerializationException：'无法将当前JSON数组（例如[1,2,3]）反序列化为类型'Binance.Net.Interfaces.IBinanceKline'，因为该类型需要JSON对象（例如{“ name” ：“ value”}）正确反序列化。 要解决此错误，可以将JSON更改为JSON对象（例如{“ name”：“ value”}），也可以将反序列化类型更改为数组，或者将实现集合接口的类型（例如ICollection，IList）更改为List，例如List从JSON数组反序列化。还可以将JsonArrayAttribute添加到类型中，以强制其从JSON数组反序列化。 路径'[0]'，第1行，位置2。'

有趣的是，代码在更新库之前曾经可以工作，现在使用IBinanceKline代替BinanceKline。

candles.json看起来像这样：

[[1598918400000,0.02916000,0.02933000,0.02805000,0.02840000,160360176.00000000,1598920199999,4581586.82491700,8467,65052915.90000000,1858526.79404600,0.0],[1598920200000,0.02841000,0.02875000,0.02832000,0.02867000,58358821.40000000,1598921999999,1666101.98325900,3117,22117012.60000000,631314.89648100,0.0]]

List<IBinanceKline> candlesFromFile = null;
if (File.Exists(CandlesFile))
{
    var content = File.ReadAllText(CandlesFile);
    candlesFromFile = JsonConvert.DeserializeObject<List<IBinanceKline>>(content); // Exception thrown here
}

List<IBinanceKline> candles;
if (candlesFromFile != null && candlesFromFile.First().OpenTime == StartDate && candlesFromFile.Last().OpenTime == EndDate)
{
    candles = candlesFromFile;
}
else
{
    candles = GetCandlesByStartDateEndDate(symbol,interval,StartDate,EndDate);

    string serializedObject = JsonConvert.SerializeObject(candles);
    File.WriteAllText(CandlesFile,serializedObject);
}

private List<IBinanceKline> GetCandlesByStartDateEndDate(string symbol,KlineInterval interval,DateTime startDate,DateTime endDate)
{
    if (endDate.Date > DateTime.UtcNow.Date)
        throw new ArgumentOutOfRangeException("The end date is greater than today.");

    var candles = _client.Spot.Market.GetKlines(symbol,startTime: startDate,endTime: endDate,limit: 200).Data.ToList();

    while (endDate > candles.Last().OpenTime)
    {
        var moreCandles = _client.Spot.Market.GetKlines(symbol,startTime: candles.Last().OpenTime,limit: 1000).Data.ToList();
        candles.AddRange(moreCandles.ExceptUsingJsonCompare(candles));
    }

    return candles;
}

public interface IBinanceKline
{
    DateTime OpenTime { get; set; }
    decimal Open { get; set; }
    decimal High { get; set; }
    decimal Low { get; set; }
    decimal Close { get; set; }
    decimal BaseVolume { get; set; }
    DateTime CloseTime { get; set; }
    decimal QuoteVolume { get; set; }
    int TradeCount { get; set; }
    decimal TakerBuyBaseVolume { get; set; }
    decimal TakerBuyQuoteVolume { get; set; }
}

解决方法

感谢您的评论，之所以出现此问题，是因为List<IBinanceKline>并未真正指定将序列化到的类。实际上，它确实序列化为List<BinanceSpotKline>。

解决方案：

List<BinanceSpotKline> candlesFromFile = null;
if (File.Exists(CandlesFile))
{
    var content = File.ReadAllText(CandlesFile);
    candlesFromFile = JsonConvert.DeserializeObject<List<BinanceSpotKline>>(content);
}

List<BinanceSpotKline> candles;
if (candlesFromFile != null && candlesFromFile.First().OpenTime == StartDate && candlesFromFile.Last().OpenTime == EndDate)
{
    candles = candlesFromFile;
}
else
{
    candles = GetCandlesByStartDateEndDate(symbol,interval,StartDate,EndDate);

    string serializedObject = JsonConvert.SerializeObject(candles);
    File.WriteAllText(CandlesFile,serializedObject);
}

private List<BinanceSpotKline> GetCandlesByStartDateEndDate(string symbol,KlineInterval interval,DateTime startDate,DateTime endDate)
{
    if (endDate.Date > DateTime.UtcNow.Date)
        throw new ArgumentOutOfRangeException("The end date is greater than today.");

    var candles = _client.Spot.Market.GetKlines(symbol,startTime: startDate,endTime: endDate,limit: 200).Data.ToList();

    while (endDate > candles.Last().OpenTime)
    {
        var moreCandles = _client.Spot.Market.GetKlines(symbol,startTime: candles.Last().OpenTime,limit: 1000).Data.ToList();
        candles.AddRange(moreCandles.ExceptUsingJsonCompare(candles));
    }

    return candles.Cast<BinanceSpotKline>().ToList();
}