Question

我是json的新手，正在尝试解析一些天气数据。除了我要尝试获取的一条信息，一切都很好。

    var datas = new List<HourData>();
    HttpResponseMessage response = await client.GetAsync(_url);
    if (response.IsSuccessStatusCode)
    {
      var content = await response.Content.ReadAsStringAsync();

      JObject obj = JObject.Parse(content);

      var token = obj.SelectToken("data.weather");
      var tokenHours = (JArray)token[0].SelectToken("hourly");

      foreach (var tk in tokenHours)
      {
        var json = JsonConvert.SerializeObject(tk);
        datas.Add(JsonConvert.DeserializeObject<HourData>(json));
      }
    }

  public class HourData
  {
    public string weatherDesc { get; set; }
    public string time { get; set; }
    public string tempF { get; set; }
    public string Summary { get; set; }
    public string Icon { get; set; }
    public string PrecipIntensity { get; set; }
    public string PrecipProbability { get; set; }
    public string Temperature { get; set; }
    public string ApparentTemperature { get; set; }
    public string DewPoint { get; set; }
    public string Humidity { get; set; }
    public string Pressure { get; set; }
    public string windSpeed { get; set; }
    public string windGust { get; set; }
    public string windBearing { get; set; }
    public string cloudCover { get; set; }
    public string uvIndex { get; set; }
    public string visibility { get; set; }
    public string windspeedMiles { get; set; }
  }

有问题的json是这样的：

{
    "data": {
        "request": [
            {
                "type": "LatLon",
                "query": "Lat 33.41 and Lon -86.94"
            }
        ],
        "nearest_area": [
            {
                "areaName": [
                    {
                        "value": "Bessemer Homestead"
                    }
                ],
                "country": [
                    {
                        "value": "United States of America"
                    }
                ],
                "region": [
                    {
                        "value": "Alabama"
                    }
                ],
                "latitude": "33.404",
                "longitude": "-86.939",
                "population": "0",
                "weatherUrl": [
                    {
                        "value": "http://api-cdn.worldweatheronline.com/v2/weather.aspx?q=33.4063059,-86.9385553"
                    }
                ]
            }
        ],
        "weather": [
            {
                "date": "2019-04-20",
                "astronomy": [
                    {
                        "sunrise": "06:12 AM",
                        "sunset": "07:22 PM",
                        "moonrise": "08:54 PM",
                        "moonset": "07:15 AM",
                        "moon_phase": "Waxing Gibbous",
                        "moon_illumination": "88"
                    }
                ],
                "maxtempC": "16",
                "maxtempF": "61",
                "mintempC": "7",
                "mintempF": "45",
                "totalSnow_cm": "0.0",
                "sunHour": "9.1",
                "uvIndex": "3",
                "hourly": [
                    {
                        "time": "0",
                        "tempC": "7",
                        "tempF": "44",
                        "windspeedMiles": "11",
                        "windspeedKmph": "17",
                        "winddirDegree": "278",
                        "winddir16Point": "W",
                        "weatherCode": "122",
                        "weatherIconUrl": [
                            {
                                "value": "http://cdn.worldweatheronline.net/images/wsymbols01_png_64/wsymbol_0004_black_low_cloud.png"
                            }
                        ],
                        "weatherDesc": [
                            {
                                "value": "Overcast"
                            }
                        ],
                        "precipMM": "0.1",
                        "humidity": "84",
                        "visibility": "5",
                        "pressure": "1009",
                        "cloudcover": "100",
                        "HeatIndexC": "7",
                        "HeatIndexF": "44",
                        "DewPointC": "4",
                        "DewPointF": "40",
                        "WindChillC": "4",
                        "WindChillF": "39",
                        "WindGustMiles": "15",
                        "WindGustKmph": "24",
                        "FeelsLikeC": "4",
                        "FeelsLikeF": "39",
                        "uvIndex": "0"

我正在尝试访问json的这一部分：

                    "weatherDesc": [
                        {
                            "value": "Overcast"
                        }

将weatherDesc添加到HourData时，出现此异常：

Newtonsoft.Json.JsonReaderException：读取字符串时出错。意外令牌：StartArray。路径“ weatherDesc”，第1行，位置280。在 Newtonsoft.Json.JsonReader.ReadAsStringInternal（）在 Newtonsoft.Json.JsonTextReader.ReadAsString（）在 Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType（JsonReader 阅读器，JsonContract合同，布尔hasConverter）位于 Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject（Object newObject，JsonReader阅读器，JsonObjectContract合同， JsonProperty成员，字符串ID）位于 Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject（JsonReader reader，类型objectType，JsonContract合同，JsonProperty成员， JsonContainerContract containerContract，JsonProperty containerMember，对象的现存值） Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal（JsonReader reader，类型objectType，JsonContract合同，JsonProperty成员， JsonContainerContract containerContract，JsonProperty containerMember，对象的现存值） Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize（JsonReader 阅读器，输入objectType，布尔值checkAdditionalContent） Newtonsoft.Json.JsonSerializer.DeserializeInternal（JsonReader reader，在以下位置输入objectType） Newtonsoft.Json.JsonConvert.DeserializeObject（String value，Type type， JsonSerializerSettings设置）位于 Newtonsoft.Json.JsonConvert.DeserializeObject [T]（String value， JsonSerializerSettings设置）位于 Newtonsoft.Json.JsonConvert.DeserializeObject [T]（String value）在 SuburbanWebService.ddays.apis.DarkskyApiReader.d__6.MoveNext（）在D：\ Source \ techguy \ Suburban Test中项目\ DarkSkyTest \ DarkSkyTest \ DarkskyApiReader.cs：第151行一个或发生了更多错误。

除weatherDesc之外的所有内容都可以解析。我得到的想法是它没有介入json的那部分，至少这是我的理解。如何进入weatherDesc并将数据输入我的班级？

任何帮助将不胜感激！

Answer 1

创建一个类来保存weatherDesc的数据：

public class WeatherDesc 
{
     public string Value { get; set; }
}

然后在您的HourData类中使用它：

public class HourData
{
    public IEnumerable<WeatherDesc> weatherDesc { get; set; }
    ...
}

根据错误，它正在读取数组，因此为什么IEnumerable。

Answer 2

主要问题在于，weatherDesc实际上是一个数组，而不是单个字符串。您应该能够通过将weatherDesc字段设为string[]而不是string来解决此问题。如果要将单例（仅包含1个条目的集合）数组展平为一个字符串，则必须自己对该对象进行反序列化。

介入JSON天气数据

2 个答案: