Deserializing JSON array into C# object

Question

I really need some help with desereliazing a JSON.

Here is my JSON : https://min-api.cryptocompare.com/data/histoday?fsym=BTC&tsym=USD

Here is the code I have so far :

using System.Collections; using System.Collections.Generic; using UnityEngine; using Newtonsoft.Json; public class StockManager : MonoBehaviour { private string webString; private CurrencyContainer container; [SerializeField]private int currenciesToLoad; void Start() { StartCoroutine(GetText()); } void Update() { if (container != null) { Debug.Log (container.Arr); } else { Debug.Log ("null"); } } IEnumerator GetText() { using (WWW www = new WWW("https://min-api.cryptocompare.com/data/histoday?fsym=BTC&tsym=USD")) { yield return www; if (www.error != null) { Debug.Log("Error is : " + www.error); } else { webString = "{ \"Arr\":" + www.text + "}"; container = JsonConvert.DeserializeObject<CurrencyContainer> (webString); } } } [System.Serializable] public class Datum { public int time; public double close; public double high; public double low; public double open; public double volumefrom; public double volumeto; } [System.Serializable] public class ConversionType { public string type; public string conversionSymbol; } [System.Serializable] public class Example { public string Response; public int Type; public bool Aggregated; public IList<Datum> Data; public int TimeTo; public int TimeFrom; public bool FirstValueInArray; public ConversionType ConversionType; } [System.Serializable] public class CurrencyContainer { public Example[] Arr; }

}

The error I get is : JsonSerializationException: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'StockManager+Example[]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.

I have no idea how to fix and any help is really appreciated. Thanks a lot.

Can you post your Json string?

Wheels73
– Wheels73

2018-01-31 09:31:01 +00:00
Commented Jan 31, 2018 at 9:31 — Wheels73
– Wheels73, Commented Jan 31, 2018 at 9:31

Christoph Fink · Accepted Answer · 2018-01-31 09:41:21Z

1

You have "one level to much" in your object structure, as the given JSON is only on "item" of your type Example. Try the following:

var item = JsonConvert.DeserializeObject<Example>(www.text);

See it HERE in action.

edited Jan 31, 2018 at 9:41

answered Jan 31, 2018 at 9:34

Christoph Fink

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4 Comments

joaoruimartins Over a year ago

That will do it. This line webString = "{ \"Arr\":" + www.text + "}"; wasn't doing any good either.

weaverbeaver Over a year ago

Also, how would I go about printing each value in Data ? For example if I print data(0) i should get {"time":1514764800,"close":13444.88,"high":13921.53,"low":12877.67,"open":13850.49,"volumefrom":78425.21,"volumeto":1057521524.42} , data(1) should print : "time":1514851200,"close":14754.13,"high":15306.13,"low":12934.16,"open":13444.88,"volumefrom":137732.17,"volumeto":1956783037.35. Well, I know it doesn't work like that because Data is an array with only one element, but how could I achieve what I want? Thanks a lot again.

Christoph Fink Over a year ago

@weaverbeaver You can access them by item.Data[index], so e.g. item.Data[0]. (I updated the fiddle to dump data(0) and data(1))

weaverbeaver Over a year ago

Yeah, I was using item.Data(index) instead of item.Data[index]. Thanks a lot again !

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