converting JSON string to C# Object

Question

I tried to deserialize JSON string to object, but got an exception, really confused.

"{

\"lastUpdateId\":787618462,
\"bids\":[[\"10451.90000000\",\"0.18884000\"],[\"10451.70000000\",\"0.01770200\"]],

\"asks\":[[\"10457.88000000\",\"0.17060500\"],[\"10458.13000000\",\"0.79300000\"]]

}"

and this is the needed object:

 public class OrderBook
    {
        [JsonProperty("lastUpdateId")]
        public int lastUpdateId { get; set; }

        [JsonProperty("asks")]
        public List<OrderBookOrder> Asks { get; set; }

        [JsonProperty("bids")]
        public List<OrderBookOrder> Bids { get; set; }

        public OrderBook(List<OrderBookOrder> asks, List<OrderBookOrder> bids)
        {
            Asks = asks;
            Bids = bids;
        }
        public OrderBook()
        {

        }
    }

    public class OrderBookOrder
    {
        public decimal Price { get; set; }
        public decimal Volume { get; set; }

        public OrderBookOrder(decimal price, decimal volume)
        {
            Price = price;
            Volume = volume;
        }
    }

so then I use NewtonSoft Json to convert the string to object

 public static implicit operator OrderBook(ApiResponse response)
        {
            return Utilities.ConverFromJason<OrderBook>(response);
        }

I think that problem is to parce two arrays (bids and asks) but can`t solve the problem. Thanks a lot for help!

What is the result if you convert the object to json? So you can compare the difference. — Jeroen van Langen, Jul 03 '19 at 07:15
i use this function called from Utilities class public static T ConverFromJason(ApiResponse response) where T : class, new() { try { return JsonConvert.DeserializeObject(response.Content); } catch (Exception) { Log.LogMessage("Empty JSON Object!"); return new T(); } } — Alexander Man, Jul 03 '19 at 07:16
Possible duplicate of [Deserializing JSON data to C# using JSON.NET](https://stackoverflow.com/questions/2546138/deserializing-json-data-to-c-sharp-using-json-net) — GWigWam, Jul 03 '19 at 07:24

score 3 · Answer 1 · answered Jul 03 '19 at 07:15

3

The JSON you gave must have class structure as shown

public class RootObject
{
    public int lastUpdateId { get; set; }
    public List<List<string>> bids { get; set; }
    public List<List<string>> asks { get; set; }
}

answered Jul 03 '19 at 07:15

Suhel Patel

278
1
12

Antonio Rodríguez · Answer 2 · 2019-07-03T10:56:42.170

Best option is to use Newtonsoft.Json (from nuget). All you have to do is:

OrderBook ob = JsonConvert.DeserializeObject<OrderBook>(response.ToString());

Your model must be something like this:

public class OrderBook
{
    [JsonProperty("lastUpdateId")]
    public int lastUpdateId { get; set; }
    [JsonProperty("bids")]
    public List<List<string>> bids { get; set; }
    [JsonProperty("asks")]
    public List<List<string>> asks { get; set; }
}

You can get a proper model from json string here: http://json2csharp.com/

Important! All your Json properties must have public getter and setter. Even if you only serialize or deserialize.

To fill your OrderBookOrder object, you have to create one specific method and call it after deserialize. It is not possible to transform a JSon model into something different using Newtonsoft.Json.

score 0 · Answer 3 · answered Jul 03 '19 at 07:16

As per your question your model class looks like below

public class OrderBook
{

    [JsonProperty("lastUpdateId")]
    public int lastUpdateId { get; set; }

    [JsonProperty("bids")]
    public IList<IList<string>> Bids { get; set; }

    [JsonProperty("asks")]
    public IList<IList<string>> Asks { get; set; }
}

And valid json format look like below

{
"lastUpdateId": 787618462,
"bids": [
    [".90000000 ", "0.18884000 "],
    ["10451.70000000 ", "0.01770200 "]
],
"asks": [
    ["10457.88000000", "0.17060500"],
    ["10458.13000000", "0.79300000"]
]
}

You can write for DeserializeObject code

public static implicit operator OrderBook(ApiResponse response)
        {
            return JsonConvert.DeserializeObject<OrderBook>(response);
        }

score 0 · Answer 4 · answered Jul 03 '19 at 09:35

0

You can also use Fluent-JSON.NET if you do not want to pollute your models with attributes.

answered Jul 03 '19 at 09:35

Alev Ryustemov

150
1
9

converting JSON string to C# Object

4 Answers4