JSON.net access nested arrays, objects

Question

how can I access in this JSON (http://www.pegelonline.wsv.de/webservices/rest-api/v2/stations.json?includeTimeseries=true&includeCurrentMeasurement=true) the nested array like timeseries.shortname? I tried like this but it doesn't work.

string url = "http://www.pegelonline.wsv.de/webservices/rest-api/v2/stations.json?includeTimeseries=true&includeCurrentMeasurement=true";

HttpWebRequest request = HttpWebRequest.CreateHttp(url);
WebResponse response = await request.GetResponseAsync();

using (Stream stream = response.GetResponseStream())
{
    JsonReader reader = new JsonTextReader(new StreamReader(stream));
    dynamic info = JArray.Load(reader);

    foreach (var item in info)
    {
        myModel.Add(new ItemModel()
        {
            uuid = item.uuid,
            number = item.number,
            city_longname = item.longname,
            timeseries = item.timeseries.shortname
        });
    }
}

The 3 items works, but the last (timeseries) gives the following error: Cannot perform runtime binding on a null reference

Answer 1

The dynamic properties give you JToken objects. Using the Value property on those gives you the string representation. In order to get it type-safe you need to parse/convert. Since you did not provide your ItemModel class details I cannot help you here.

myModel.Add(new ItemModel()
{
  uuid = item.uuid.Value,
  number = item.number.Value,
  city_longname = item.longname.Value
});

The timeseries property is a JArray object. You cannot get to the shortname property directly. You have to choose an index first (item.timeseries[5], for instance, give you the JObject instance you are after). The details regarding getting the actual values in a type-safe manner from above apply here as well.