C# JSON Get data from List<>

Question

I am trying to make simple UWP weather app, just for learning purpose, and I am having trouble getting data from JSON.

How to get min and max temperature from public class ConsolidatedWeather? I can get data from other classes.

Thanks a lot

Vrime.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;


namespace _01_Weaather
{

class Vrime
{

    public async static Task<ConsolidatedWeather> ShowTemp()
    {
        var http = new HttpClient();
        var url = String.Format("https://www.metaweather.com/api/location/44418/");
        var response = await http.GetAsync(url);
        var result = await response.Content.ReadAsStringAsync();           
        var ser = new DataContractJsonSerializer(typeof(ConsolidatedWeather));
        var ms = new MemoryStream(Encoding.UTF8.GetBytes(result));
        var data = (ConsolidatedWeather)ser.ReadObject(ms);

        return data;
    }
}

[DataContract]
public class ConsolidatedWeather
{
    [DataMember]
    public object id { get; set; }
    [DataMember]
    public string weather_state_name { get; set; }
    [DataMember]
    public string weather_state_abbr { get; set; }
    [DataMember]
    public string wind_direction_compass { get; set; }
    [DataMember]
    public string created { get; set; }
    [DataMember]
    public string applicable_date { get; set; }
    [DataMember]
    public double min_temp { get; set; }
    [DataMember]
    public double max_temp { get; set; }
    [DataMember]
    public double the_temp { get; set; }
    [DataMember]
    public double wind_speed { get; set; }
    [DataMember]
    public double wind_direction { get; set; }
    [DataMember]
    public double air_pressure { get; set; }
    [DataMember]
    public int humidity { get; set; }
    [DataMember]
    public double? visibility { get; set; }
    [DataMember]
    public int predictability { get; set; }
}
[DataContract]
public class Parent
{
    [DataMember]

    public string title { get; set; }
    [DataMember]
    public string location_type { get; set; }
    [DataMember]
    public int woeid { get; set; }
    [DataMember]
    public string latt_long { get; set; }
}
[DataContract]
public class Source
{
    [DataMember]
    public string title { get; set; }
    [DataMember]
    public string slug { get; set; }
    [DataMember]
    public string url { get; set; }
    [DataMember]
    public int crawl_rate { get; set; }
}
[DataContract]
public class RootObject
{[DataMember]
    public List<ConsolidatedWeather> consolidated_weather { get; set; }
    [DataMember]
    public string time { get; set; }
    [DataMember]
    public string sun_rise { get; set; }
    [DataMember]
    public string sun_set { get; set; }
    [DataMember]
    public string timezone_name { get; set; }
    [DataMember]
    public Parent parent { get; set; }
    [DataMember]
    public List<Source> sources { get; set; }
    [DataMember]
    public string title { get; set; }
    [DataMember]
    public string location_type { get; set; }
    [DataMember]
    public int woeid { get; set; }
    [DataMember]
    public string latt_long { get; set; }
    [DataMember]
    public string timezone { get; set; }
}

MainPage.xaml

 namespace _01_Weaather
 {
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
{
    double min;
    double max;


    public MainPage()
    {
        this.InitializeComponent();



    }

    private async void BtnPrikaz_OnClick(object sender, RoutedEventArgs e)
    {
       ConsolidatedWeather cWeather = await Vrime.ShowTemp();
        min =cWeather.min_temp;
        max = cWeather.max_temp;
        txtTemp.Text = String.Format(min.ToString() + "\n"+ max.ToString());


    }

}

from where you are getting the values for min and max as inputs to the function? — Sajeetharan
– Sajeetharan, Commented May 7, 2017 at 16:23
you dont understand my question., await Vrime.ShowTemp(min, max); what is min and max here — Sajeetharan
– Sajeetharan, Commented May 7, 2017 at 16:35

saurabh · Accepted Answer · 2017-05-08 07:45:37Z

Your deserializing is not on the correct object. It should be on RootObject. As the JSON retured by weather API returns data for future dates as well so if you need Min and Max temperature for today then below is the sample code.

public async Task<RootObject> ShowTemp()
    {
        var http = new HttpClient();
        var url = String.Format("https://www.metaweather.com/api/location/44418/");
        var response = await http.GetAsync(url);
        var result = await response.Content.ReadAsStringAsync();
        var ser = new DataContractJsonSerializer(typeof(RootObject));
        var ms = new MemoryStream(Encoding.UTF8.GetBytes(result));
        var data = (RootObject)ser.ReadObject(ms);

        return data;
    }

    public async Task<ConsolidatedWeather> GetWeatherForToday()
    {
        RootObject ro = await ShowTemp();
        ConsolidatedWeather todayWeather = ro.consolidated_weather.FirstOrDefault();
        return todayWeather;

        // for getting min and max
        // todayWeather.min_temp;
        // todayWeather.max_temp;
    }

CoderKK · Accepted Answer · 2017-05-07 16:53:11Z

1

try changing the data types of the attributes min & max temperature to float and you are using wrong object type to deserialize. use your root object. Also, i'd recommend using something like restsharp for api consumption. thats going to make your life 2X easier.

edited May 7, 2017 at 16:53

answered May 7, 2017 at 16:27

CoderKK

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2 Comments

Toni0123 Over a year ago

Can you write how to deserialize root object?

CoderKK Over a year ago

follow the instruction on the link. it pretty much says it all. newtonsoft.com/json/help/html/SerializingJSON.htm

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