嘗試從「OpenWeatherMap.org」中檢索數據時發生異常

我目前正在使用Weather API，其中我嘗試從OpenWeatherMap.org獲取值。但是當我點擊按鈕從網站上檢索信息時。它給了我下面的錯誤。 Here's the Screenshot of the exception,I am Getting 嘗試從「OpenWeatherMap.org」中檢索數據時發生異常

另外這裏是按鈕的用戶界面我點擊。 Here's the Screenshot

System.Exception was unhandled by user code 
HResult=-2146233088 
Message=Exception of type 'System.Exception' was thrown. 
Source=UWPWeather 
StackTrace: 
    at UWPWeather.LocationManager.<GetPosition>d__0.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() 
    at UWPWeather.MainPage.<Button_Click>d__1.MoveNext() 
    InnerException:

的OpenWeatherMapProxy.cs代碼：

 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; 

     namespace WeatherAPI 
     { 
     public class OpenWeatherMapProxy 
     { 
     public async static Task<RootObject>GetWeather(double lat,double lon) 

     { 

     var http = new HttpClient(); 

     var response = await http.GetAsync("http://api.openweathermap.org/data/2.5/weather? lat=35&lon=77.20081&appid=b1b15e88fa797225412429c1c50c122a"); 


     var result = await response.Content.ReadAsStringAsync(); 

     var serializer = new DataContractJsonSerializer(typeof(RootObject)); 

     var ms = new MemoryStream(Encoding.UTF8.GetBytes(result)); 

     var data = (RootObject)serializer.ReadObject(ms); 
     return data; 

    } 

} 

public class Coord 
{ 
    [DataMember] 
    public double lon { get; set; } 
    [DataMember] 
    public double lat { get; set; } 
} 
[DataContract] 
public class Weather 
{ 
    [DataMember] 
    public int id { get; set; } 
    [DataMember] 
    public string main { get; set; } 
    [DataMember] 
    public string description { get; set; } 
    [DataMember] 
    public string icon { get; set; } 
} 
[DataContract] 
public class Main 
{ 
    [DataMember] 
    public double temp { get; set; } 
    [DataMember] 
    public int pressure { get; set; } 
    [DataMember] 
    public int humidity { get; set; } 
    [DataMember] 
    public double temp_min { get; set; } 
    [DataMember] 
    public double temp_max { get; set; } 
} 
[DataContract] 
public class Wind 
{ 
    [DataMember] 
    public double speed { get; set; } 
    [DataMember] 
    public int deg { get; set; } 
} 
[DataContract] 
public class Clouds 
{ 
    [DataMember] 
    public int all { get; set; } 
} 
[DataContract] 
public class Sys 
{ 
    [DataMember] 
    public int type { get; set; } 
    [DataMember] 
    public int id { get; set; } 
    [DataMember] 
    public double message { get; set; } 
    [DataMember] 
    public string country { get; set; } 
    [DataMember] 
    public int sunrise { get; set; } 
    [DataMember] 
    public int sunset { get; set; } 
} 
[DataContract] 
public class RootObject 
{ 
    [DataMember] 
    public Coord coord { get; set; } 
    [DataMember] 
    public List<Weather> weather { get; set; } 
    [DataMember] 
    public string @base { get; set; } 
    [DataMember] 
    public Main main { get; set; } 
    [DataMember] 
    public Wind wind { get; set; } 
    [DataMember] 
    public Clouds clouds { get; set; } 
    [DataMember] 
    public int dt { get; set; } 
    [DataMember] 
    public Sys sys { get; set; } 
    [DataMember] 
    public int id { get; set; } 
    [DataMember] 
    public string name { get; set; } 
    [DataMember] 
    public int cod { get; set; } 
}

MainPage.xaml.cs中的代碼：

using System; 
    using System.Collections.Generic; 
    using System.IO; 
    using System.Linq; 
    using System.Runtime.InteropServices.WindowsRuntime; 
    using Windows.Foundation; 
    using Windows.Foundation.Collections; 
    using Windows.UI.Xaml; 
    using Windows.UI.Xaml.Controls; 
    using Windows.UI.Xaml.Controls.Primitives; 
    using Windows.UI.Xaml.Data; 
    using Windows.UI.Xaml.Input; 
    using Windows.UI.Xaml.Media; 
    using Windows.UI.Xaml.Navigation; 

    // The Blank Page item template is documented at   http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409 

    namespace WeatherAPI 
    { 
/// <summary> 
/// An empty page that can be used on its own or navigated to within a Frame. 
/// </summary> 
public sealed partial class MainPage : Page 
{ 
    public MainPage() 
    { 
     this.InitializeComponent(); 
    } 

    private async void Button_Click(object sender, RoutedEventArgs e) 
    { 
     RootObject myWeather = await OpenWeatherMapProxy.GetWeather(20.0,30.0); 
     ResultTextBlock.Text = myWeather.name + " - " + ((int)myWeather.main.temp).ToString(); 
    } 
}

}

來源

2016-03-21 Prateek Gogia

-1

((int)myWeather.main.temp).ToString()

我要問：爲什麼詮釋然後回到字符串？

不管怎麼說，回答您的問題：

您需要檢查myWeather = NULL & & myWeather.main = NULL & & myWeather.main.temp = NULL

其中之一！！爲空，這是給你的例外。

來源

2016-03-21 17:34:40

我檢查了一遍，沒有！沒有什麼是空的。我已經提供了代碼。你能看看嗎？ –

* * **必須爲空或您不會得到異常！ @PrateekGogia – Plutonix

@Plutonix男人我檢查了整個該死的代碼！但我沒有找到任何東西。你能幫忙嗎？ –

下面是運行的代碼（正在運行一個控制檯應用程序）：

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; 

namespace ConsoleApplication1 
{ 
    public class OpenWeatherMapProxy 
    { 
     public async static Task<RootObject> GetWeather(double lat, double lon) 

     { 

      var http = new HttpClient(); 

      var response = await http.GetAsync("http://api.openweathermap.org/data/2.5/weather?lat=35&lon=77.20081&appid=b1b15e88fa797225412429c1c50c122a"); 


      var result = await response.Content.ReadAsStringAsync(); 

      var serializer = new DataContractJsonSerializer(typeof(RootObject)); 

      var ms = new MemoryStream(Encoding.UTF8.GetBytes(result)); 

      var data = (RootObject)serializer.ReadObject(ms); 
      return data; 

     } 
    } 


    public class Coord 
    { 
     [DataMember] 
     public double lon { get; set; } 
     [DataMember] 
     public double lat { get; set; } 
    } 

    [DataContract] 
    public class Weather 
    { 
     [DataMember] 
     public double id { get; set; } 
     [DataMember] 
     public string main { get; set; } 
     [DataMember] 
     public string description { get; set; } 
     [DataMember] 
     public string icon { get; set; } 
    } 

    [DataContract] 
    public class Main 
    { 
     [DataMember] 
     public double temp { get; set; } 
     [DataMember] 
     public double pressure { get; set; } 
     [DataMember] 
     public double humidity { get; set; } 
     [DataMember] 
     public double temp_min { get; set; } 
     [DataMember] 
     public double temp_max { get; set; } 
    } 

    [DataContract] 
    public class Wind 
    { 
     [DataMember] 
     public double speed { get; set; } 
     [DataMember] 
     public double deg { get; set; } 
    } 

    [DataContract] 
    public class Clouds 
    { 
     [DataMember] 
     public double all { get; set; } 
    } 

    [DataContract] 
    public class Sys 
    { 
     [DataMember] 
     public double type { get; set; } 
     [DataMember] 
     public double id { get; set; } 
     [DataMember] 
     public double message { get; set; } 
     [DataMember] 
     public string country { get; set; } 
     [DataMember] 
     public double sunrise { get; set; } 
     [DataMember] 
     public double sunset { get; set; } 
    } 

    [DataContract] 
    public class RootObject 
    { 
     [DataMember] 
     public Coord coord { get; set; } 
     [DataMember] 
     public List<Weather> weather { get; set; } 
     [DataMember] 
     public string @base { get; set; } 
     [DataMember] 
     public Main main { get; set; } 
     [DataMember] 
     public Wind wind { get; set; } 
     [DataMember] 
     public Clouds clouds { get; set; } 
     [DataMember] 
     public double dt { get; set; } 
     [DataMember] 
     public Sys sys { get; set; } 
     [DataMember] 
     public double id { get; set; } 
     [DataMember] 
     public string name { get; set; } 
     [DataMember] 
     public double cod { get; set; } 
    } 

    class Program 
    { 
     static void Main(string[] args) 
     { 
      RootObject myWeather = Task.Run(() => OpenWeatherMapProxy.GetWeather(20.0, 30.0)).Result; 
      Console.WriteLine(myWeather.name + " - " + ((int)myWeather.main.temp).ToString()); 
     } 

    }

來源

2016-03-21 18:02:57

你是否得到天氣結果？ –

是的，所有的字段都被填充。如果您在打印出值的行上設置斷點，則可以在myWeather中查看所有值。 –

我該怎麼做？ –

嘗試從「OpenWeatherMap.org」中檢索數據時發生異常

回答

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