JSON解析使用JSON.NET窗口電話

Question

我試圖從openweathermap解析7天預測。我在foreach (JObject array in JsonRequest["main"]["wind"]["name"]["weather"])行中發現了null參考，但我不明白爲什麼。我需要填寫我的課程，並顯示預計7天。

string queryString = "http://api.openweathermap.org/data/2.1/forecast/city?lat=" + latitude + "&lon=" + longitude + "?units=metric"; 
     dynamic results = await DataService.getDataFromService(queryString).ConfigureAwait(false); 

     MyWeather wetherobject = new MyWeather(); 
     PanoramaItemObject ItemObject = new PanoramaItemObject(); 

     var JsonRequest = JObject.Parse(results); 

     foreach (JObject array in JsonRequest["main"]["wind"]["name"]["weather"]) 
     { 
      JObject obj = JObject.Parse(array.ToString()); 
      wetherobject.Temperature=(string)obj["temp"]; 
      wetherobject.Humidity=(string)obj["humidity"]; 
      wetherobject.Temperature_max=(string)obj["temp_max"]; 
      wetherobject.Temperature_min=(string)obj["temp_min"]; 
      wetherobject.Title=(string)obj["main"]; 
      wetherobject.Description=(string)obj["description"]; 
      wetherobject.Wind=(string)obj["speed"]; 
      ItemObject.forecasts.Add(wetherobject); 
     } 

的層次結構如下：

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

public class City 
{ 
    public int id { get; set; } 
    public string name { get; set; } 
    public Coord coord { get; set; } 
    public string country { get; set; } 
    public int population { get; set; } 
} 

public class Main 
{ 
    public double temp { get; set; } 
    public double temp_min { get; set; } 
    public double temp_max { get; set; } 
    public double pressure { get; set; } 
    public double sea_level { get; set; } 
    public double grnd_level { get; set; } 
    public int humidity { get; set; } 
    public double temp_kf { 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 Clouds 
{ 
    public int all { get; set; } 
} 

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

public class Sys 
{ 
    public string pod { get; set; } 
} 

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

public class List 
{ 
    public int dt { get; set; } 
    public Main main { get; set; } 
    public List<Weather> weather { get; set; } 
    public Clouds clouds { get; set; } 
    public Wind wind { get; set; } 
    public Sys sys { get; set; } 
    public string dt_txt { get; set; } 
    public Rain rain { get; set; } 
} 

public class RootObject 
{ 
    public string cod { get; set; } 
    public string message { get; set; } 
    public City city { get; set; } 
    public int cnt { get; set; } 
    public string model { get; set; } 
    public List<List> list { get; set; } 
} 

我所做的就像是建議。豁免是：'Newtonsoft.Json.Linq.JObject'不包含'list'的定義

string queryString = "http://api.openweathermap.org/data/2.1/forecast/city?lat=" + latitude + "&lon=" + longitude + "?units=metric"; 

     HttpClient client = new HttpClient(); 
     string results = await client.GetStringAsync(queryString).ConfigureAwait(false); 
     MyWeather wetherobject = new MyWeather(); 
     PanoramaItemObject ItemObject = new PanoramaItemObject(); 

     dynamic JsonRequest = JObject.Parse(results); 

     foreach (var array in JsonRequest.list) 
     { 
      //JObject obj = JObject.Parse(array.ToString()); 
      wetherobject.Temperature=(string)array.main.temp; 
      wetherobject.Humidity=(string)array.main.humidity; 
      wetherobject.Temperature_max=(string)array.main.temp_max; 
      wetherobject.Temperature_min = (string)array.main.temp_min; 
      wetherobject.Title=(string)array.weather.main; 
      wetherobject.Description=(string)array.weather.description; 
      wetherobject.Wind=(string)array.wind.speed; 
      ItemObject.forecasts.Add(wetherobject); 

     } 

Answer 1

您的對象層次結構不同。下面的示例應該可以工作

double latitude = 51.5085300; 
double longitude = -0.1257400; 
string queryString = "http://api.openweathermap.org/data/2.1/forecast/city?lat=" + latitude + "&lon=" + longitude + "?units=metric"; 

HttpClient client = new HttpClient(); 
string results = await client.GetStringAsync(queryString).ConfigureAwait(false); 

dynamic jobj = JObject.Parse(results); 
foreach (var item in jobj.list) 
{ 

    Console.WriteLine("{0} TEMP:{1} WIND:{2}", 
     DateTime.ParseExact((string)item.dt_txt, "yyyy-MM-dd HH:mm:ss", null), 
     (item.main.temp - 273.15), 
     item.wind.speed); 
}