WeatherHandler.cs

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;

namespace WeatherDesktop
{
    internal class WeatherHandler
    {
        private string _token;
        private string _lat;
        private string _lon;
        public WeatherHandler()
        {
            FileStream stream = new FileStream(Directory.GetParent(Directory.GetCurrentDirectory()).Parent.FullName + "\\sys.env", FileMode.Open);
            StreamReader sr = new StreamReader(stream);
            _token = sr.ReadToEnd();

        }
        private void UpdateCoords(string cityName)
        {
            
                string _url = $"http://api.openweathermap.org/geo/1.0/direct?q={cityName},RUS&appid={_token}";
                HttpWebRequest request = WebRequest.Create(_url) as HttpWebRequest;
                HttpWebResponse response = request.GetResponse() as HttpWebResponse;

                string json;

                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    json = reader.ReadToEnd();
                }
                List<Coordinates> coordinates = JsonConvert.DeserializeObject(json, typeof(List<Coordinates>)) as List<Coordinates>;
                //List, так как может быть несколько городов с одинаковым названием, а значит несколько координат
                _lat = coordinates[0].Lat.ToString();
                _lon = coordinates[0].Lon.ToString();
        }
        public WeatherInfo GetActualWeather(string cityName)
        {
            UpdateCoords(cityName);

            string _url = $"http://api.openweathermap.org/data/2.5/weather?lat={_lat}&lon={_lon}&appid={_token}&units=metric";
            HttpWebRequest request = WebRequest.Create(_url) as HttpWebRequest;
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;

            string json;

            using (StreamReader reader = new StreamReader(response.GetResponseStream()))
            {
                json = reader.ReadToEnd();
            }
            WeatherInfo result = JsonConvert.DeserializeObject(json, typeof(WeatherInfo)) as WeatherInfo;
            return result;
        }
    }
}