5jPbzZPg

1public async Task<IEnumerable<WeatherForecast>> GetForecastAsync(string location, int days)
2		{
3			if (location == null) throw new ArgumentNullException("Location can't be null.");
4			if (location == string.Empty) throw new ArgumentException("Location can't be an empty string.");
5			if (days <= 0) throw new ArgumentOutOfRangeException("Days should be greather than zero.");
6            if (days > _MAX_FORECAST_DAYS) throw new ArgumentOutOfRangeException($"Days can't be greater than {_MAX_FORECAST_DAYS}");
7
8			//var query = $"forecast/daily?q={location}&type=accurate&mode=xml&units=metric&cnt={days}&appid={_APP_KEY}";
9			var query = $"forecast?q=London,us&mode=xml&appid=b6907d289e10d714a6e88b30761fae22";
10			var response = await _client.GetAsync(query);
11
12			switch (response.StatusCode)
13			{
14				case HttpStatusCode.Unauthorized:
15					throw new Exception("Invalid API key.");
16				case HttpStatusCode.NotFound:
17					throw new Exception("Location not found.");
18				case HttpStatusCode.OK:
19					var s = await response.Content.ReadAsStringAsync();
20					var x = XElement.Load(new StringReader(s));
21
22					var data = x.Descendants("time").Select(w => new WeatherForecast
23					{
24						Date = DateTime.Now,
25						Description = w.Element("symbol").Attribute("name").Value,
26						WindSpeed = double.Parse(w.Element("windSpeed").Attribute("mps").Value),
27						CurrentTemperature = double.Parse(w.Element("temperature").Attribute("value").Value),
28						MaxTemperature = double.Parse(w.Element("temperature").Attribute("max").Value),
29						MinTemperature = double.Parse(w.Element("temperature").Attribute("min").Value),
30					});
31					return data;
32				default:
33					throw new NotImplementedException(response.StatusCode.ToString());
34			}
35		}
36
37public partial class MainWindow : Window
38	{
39		List<WeatherForecast> forecast;
40		WeatherForecast currentWeather;
41		OpenWeatherMapService service;
42
43		Task API_CALL;
44
45		public MainWindow()
46		{
47			InitializeComponent();
48			
49			service = new OpenWeatherMapService();
50		}
51	
52		public async Task GetWeather()
53		{
54			try
55			{
56				var weather = await service.GetForecastAsync("London", 3);
57				currentWeather = weather.First();
58				forecast = weather.Skip(1).Take(2).ToList();
59				
60				// Update UI element now
61				Date.Text = currentWeather.Date.ToString("MM/dd/yyyy h:mm tt");
62			}
63			catch (Exception ex)
64			{
65				throw new Exception(ex.Message);
66			}
67		}
68
69		private void ButtonGetWeather_Click(object sender, RoutedEventArgs e)
70		{
71			API_CALL = GetWeather();
72		}
73	}