get data from json c#

Question

I have a problem I want to get data from Json, and the data successfully gets from the json to the variable json but when I want to send the data to WeatherData it send me a zero value. I have one class that cald "WeatherData" and I want to send to data from the json (that existing a class "jsonParse") to this class.

jsonParse

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Web.Script.Serialization;
using System.IO;


namespace weather
{
    public class jsonParse : Ijson
    {
        private string urlAdd;

        public jsonParse(string _url)
        {
            if (_url == null)
            {
                //throw exption
            }
            else
                urlAdd = _url;
        }

        public WeatherData parse()
        {

            //string json = new WebClient().DownloadString(urlAdd);
            //var obj = JsonConvert.DeserializeObject<WeatherData>(json);
            //Console.WriteLine(obj.temp);
           // WeatherData m = JsonConvert.DeserializeObject<WeatherData>(json);


                WebClient n = new WebClient();
                var json = n.DownloadString(urlAdd);
                string valueOriginal = Convert.ToString(json);
                WeatherData m = JsonConvert.DeserializeObject<WeatherData>(json);
                Console.WriteLine(m);




                return m;

        }


    }
}

WeatherData

namespace weather
{
    public class WeatherData
    {

        public WeatherData(double _temp, double _minTemp, double _maxTemp )
        {
            temp = _temp;
            minTemp = _minTemp;
            maxTemp = _maxTemp;

        }

        public double temp { get; set; }
        public double minTemp { get; set; }
        public double maxTemp { get; set; }

        public override string ToString()
        {
            return "the weather:" + temp + "minTemp is:" + minTemp + "maxTemp:" + maxTemp;
        }
    }
}

json

{"coord":{"lon":139,"lat":35},
"sys":{"country":"JP","sunrise":1369769524,"sunset":1369821049},
"weather":[{"id":804,"main":"clouds","description":"overcast clouds","icon":"04n"}],
"main":{"temp":289.5,"humidity":89,"pressure":1013,"temp_min":287.04,"temp_max":292.04},
"wind":{"speed":7.31,"deg":187.002},
"rain":{"3h":0},
"clouds":{"all":92},
"dt":1369824698,
"id":1851632,
"name":"Shuzenji",
"cod":200}

Amit Kumar Ghosh · Accepted Answer · 2016-04-21 09:25:58Z

1

If you only care about the weather part of the json, try this -

        var o = (JArray)JObject.Parse(jsonString)["weather"];
        foreach(JToken item in o)
        {
            Console.WriteLine(((JValue)item["id"]).Value);
            Console.WriteLine(((JValue)item["main"]).Value);
            Console.WriteLine(((JValue)item["description"]).Value);
            Console.WriteLine(((JValue)item["icon"]).Value);
        }

answered Apr 21, 2016 at 9:25

Amit Kumar Ghosh

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1 Comment

user3488862 Over a year ago

And if I want main values - temp, min temp and max temp what do I do?

Elektryczny · Accepted Answer · 2016-04-21 08:39:28Z

First object in json is coord, don't see that in your model. You should change your JsonModel to deserialize. From c# class generator:

public class Coord
{
    public int lon { get; set; }
    public int lat { get; set; }
}

public class Sys
{
    public string country { get; set; }
    public int sunrise { get; set; }
    public int sunset { get; set; }
}

public class Weather
{
    public int id { get; set; }
    public string main { get; set; }
    public string description { get; set; }
    public string icon { get; set; }
}

public class Main
{
    public double temp { get; set; }
    public int humidity { get; set; }
    public int pressure { get; set; }
    public double temp_min { get; set; }
    public double temp_max { get; set; }
}

public class Wind
{
    public double speed { get; set; }
    public double deg { get; set; }
}

public class Rain
{
    public int __invalid_name__3h { get; set; }
}

public class Clouds
{
    public int all { get; set; }
}

public class RootObject
{
    public Coord coord { get; set; }
    public Sys sys { get; set; }
    public List<Weather> weather { get; set; }
    public Main main { get; set; }
    public Wind wind { get; set; }
    public Rain rain { get; set; }
    public Clouds clouds { get; set; }
    public int dt { get; set; }
    public int id { get; set; }
    public string name { get; set; }
    public int cod { get; set; }
}

Where RootObject is your JsonConvert.DeserializeObject(json); So you can change class names as you like.

If you want to name properties with your name (not json names) use [JsonProperty"jsonName"] string yourName;
Well with deserializer i think you have to use following properties to your directed one. Mean if you need "country", you have to add class with "sys". IMO.

error_handler · Accepted Answer · 2016-04-21 08:52:02Z

Simply you cannot Deserialize a json object to a non-matching class object. So make sure you have a model object that have atleast all the properties that JSON object have.

In this case you would need following classes that are generated from your JSON object:

public class Coord
{
    public int lon { get; set; }
    public int lat { get; set; }
}

public class Sys
{
    public string country { get; set; }
    public int sunrise { get; set; }
    public int sunset { get; set; }
}

public class Weather
{
    public int id { get; set; }
    public string main { get; set; }
    public string description { get; set; }
    public string icon { get; set; }
}

public class Main
{
    public double temp { get; set; }
    public int humidity { get; set; }
    public int pressure { get; set; }
    public double temp_min { get; set; }
    public double temp_max { get; set; }
}

public class Wind
{
    public double speed { get; set; }
    public double deg { get; set; }
}

public class Rain
{
    public int __invalid_name__3h { get; set; }
}

public class Clouds
{
    public int all { get; set; }
}

public class ParentModel
{
    public Coord coord { get; set; }
    public Sys sys { get; set; }
    public List<Weather> weather { get; set; }
    public Main main { get; set; }
    public Wind wind { get; set; }
    public Rain rain { get; set; }
    public Clouds clouds { get; set; }
    public int dt { get; set; }
    public int id { get; set; }
    public string name { get; set; }
    public int cod { get; set; }
}

ParentModel m = JsonConvert.DeserializeObject<ParentModel>(json);

Hope this helps.

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