C＃和天气API，获取特定数据

Question

I am getting data from weather API and I would like to return only specific data lets say humidity not the whole object.

public Object getWeatherForcast()
    {
        string url = "http://api.openweathermap.org/data/2.5/weather?q=Aalborg&APPID=appid&units=imerial";

        var client = new WebClient();
        var content = client.DownloadString(url);
        var serializer = new JavaScriptSerializer();
        var jsonContent = serializer.Deserialize<Object>(content);

        //here if I use only jsonContent it returns all data, unfortunately I don t know how to get
        //the specific data
        return jsonContent.main.humidity;


    }

here if I use only jsonContent it returns all data, unfortunately I don t know how to get the specific data

Answer 1

Instead of deserializing to a type Object , it would be recommended that you deserialize to your own type of object, like Weather report or something like that, so you can do something like this:

WeatherReport report = serializer.Deserialize<WeatherReport>(content);

That would be much easy for you.

Anyway, given what you have right there, you can do something like this:

jsonContent.main[2].ToString(); //Or whatever other method or property you prefer

Answer 2

It would be better to prepare a class(es) representing the data you want to read from the JSON, as already mentioned, but if you want to keep it your way, or just read single value (eg humidity from "main" section), you may use dynamic with the following small code snippet:

var jsonContent = serializer.Deserialize<dynamic>(content);
var humidity = jsonContent["main"]["humidity"];

EDIT

In your case JavaScriptSerializer deserializes objects to Dictionary<string, object> , so you have to access it's properties with indexer, as showed above. If you use Newtonsoft.Json library to deserialize JSON, using dynamic as well, you could get something like the following, cleaner sample, accessing the data using properties:

var jsonContent = JsonConvert.DeserializeObject<dynamic>(content);
humidity = jsonContent.main.humidity;