I’m trying to get the name:value pair from a Json-file which look like this:

[
  {
    "SEK_per_kWh": 0.0584,
    "EUR_per_kWh": 0.005,
    "EXR": 11.680045,
    "time_start": "2024-05-11T00:00:00+02:00",
    "time_end": "2024-05-11T01:00:00+02:00"
  },
  {
    "SEK_per_kWh": 0.14869,
    "EUR_per_kWh": 0.01273,
    "EXR": 11.680045,
    "time_start": "2024-05-11T01:00:00+02:00",
    "time_end": "2024-05-11T02:00:00+02:00"
  },
  {
    ...
  }
]

In my code:

            using (WebClient web = new WebClient())
            {
                string year = txt_year.Text;
                string month = txt_month.Text;
                string day = txt_day.Text;
                string priceClass = txt_priceClass.Text;
                string URL = string.Format("https://www.elprisetjustnu.se/api/v1/prices/{0}/{1}-{2}_{3}.json", year, month, day, priceClass);
                var json = web.DownloadString(URL);

                //var elInfo = JsonConvert.DeserializeObject<JArray>(json);



                var elObject = JToken.Parse(json);

                var elArray = elObject.Children<JProperty>().FirstOrDefault(x => x.Name == "SEK_per_kWh").Value;

                foreach (var item in elArray.Children())
                {
                    var itemProperties = item.Children<JProperty>();
                    var myElement = itemProperties.FirstOrDefault(x => x.Name == "SEK_per_kWh");
                    var myElementValue = myElement.Value; ////This is a JValue type
                    txt_answer.Text = myElementValue.ToString();
                }

this row:

var elArray = elObject.Children<JProperty>().FirstOrDefault(x => x.Name == "SEK_per_kWh").Value;

throws:

System.NullReferenceException: ‘Objektreferensen har inte angetts till en instans av ett objekt.’

Why is this row null, does it has to do with

var elArray

not being a array or something…?

I have tried a lot of other code but hadn’t got it to work.

                var elObject = JToken.Parse(json);
                var elArray = new JArray();


                foreach (JProperty prop in elObject)
                {
                    elArray.Add($"{prop.Name}:{prop.Value}");
                }
                txt_answer.Text = elArray.ToString();

This code throws:

System.InvalidCastException: ‘Det gick inte att omvandla ett objekt av typen Newtonsoft.Json.Linq.JObject till typen Newtonsoft.Json.Linq.JProperty.’

at this :

foreach (JProperty prop in elObject)

Seems like prop is null here.