我可以添加其他类型，该类型将在供应JSON时结合多个JSON属性

Question

原始JSON C＃类结构看起来像

 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 Snow
    {
        public double? 3h { get; set; }
    }
    public class Sys
    {
        public string pod { get; set; }
    }
    public class Rain
    {
        public double 3h { get; set; }
    }
    public class List
    {
        public int dt { get; set; }
        public Main main { get; set; }
        public IList<Weather> weather { get; set; }
        public Clouds clouds { get; set; }
        public Wind wind { get; set; }
        public Snow snow { get; set; }
        public Sys sys { get; set; }
        public string dt_txt { get; set; }
        public Rain rain { get; set; }
    }
    public class Coord
    {
        public double lat { get; set; }
        public double lon { 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 class Example
    {
        public string cod { get; set; }
        public double message { get; set; }
        public int cnt { get; set; }
        public IList<List> list { get; set; }
        public City city { get; set; }
    }

我想删除一些属性并将其他属性合并到我的类型中，所以最后我想获得下一个C＃类结构：

public class WeatherForecast
    {
        [JsonProperty("city")]
        public City City { get; set; }
        [JsonProperty("list")]
        public IList<ClimateIndicators> ClimateIndicators { get; set; }
    }
 public class ClimateIndicators
    {
        public Atmospheric Atmospheric { get; set; }
        public Hydrospheric Hydrospheric { get; set; }
        public Lithospheric Lithospheric { get; set; }
        public DateTime Date { get; set; }
        public IList<WeatherDetails> WeatherDetails { get; set; }
    }
 public class Atmospheric
    {
        [JsonProperty("pressure")]
        public double Pressure { get; set; }
        [JsonProperty("humidity")]
        public int Humidity { get; set; }
        [JsonProperty("sea_level")]
        public double SeaLevel { get; set; }
        [JsonProperty("grnd_level")]
        public double GroundLevel { get; set; }
        [JsonProperty("all")]
        public int Cloudiness { get; set; }
        [JsonProperty("rain")]
        public double? Rain { get; set; }
        [JsonProperty("snow")]
        public double? Snow { get; set; } 
    }

我正在为天气条件添加自定义分类。因此，我面临的问题是我不知道如何将多个JSON属性合并到一个属性的单个类中。

Answer 1

由于您想要的类结构与JSON的形状不同，因此您需要创建一个自定义的JsonConverter来弥合差异。在您的情况下，WeatherForecast和City类不需要任何特殊的处理（仅使用[JsonProperty]属性就足够了），但是ClimateIndicators类肯定需要转换器。

这就是代码中的外观。转换器通过将list数组每个项目的JSON数据加载到临时JObject中来起作用。（json.net对每个项目调用ReadJson一次，因此这就是为什么转换器中没有循环的原因。）从那里，SelectToken用于从填充ClimateIndicators类实例所需的各种嵌套项目属性中挑选出值及其支持类Atmospheric。然后将ClimateIndicators实例返回到JSON.NET，该实例将其自动将其添加到WeatherForecast类中的列表中。

class ClimateIndicatorsConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(ClimateIndicators);
    }
    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        JObject obj = JObject.Load(reader);
        Atmospheric atm = new Atmospheric();
        atm.Pressure = (double)obj.SelectToken("main.pressure");
        atm.Humidity = (int)obj.SelectToken("main.humidity");
        atm.SeaLevel = (double)obj.SelectToken("main.sea_level");
        atm.GroundLevel = (double)obj.SelectToken("main.grnd_level");
        atm.Cloudiness = (int)obj.SelectToken("clouds.all");
        atm.Rain = (double?)obj.SelectToken("rain.3h");
        atm.Snow = (double?)obj.SelectToken("snow.3h");
        ClimateIndicators indicators = new ClimateIndicators();
        indicators.Atmospheric = atm;
        indicators.Date = (DateTime)obj.SelectToken("dt_txt");
        return indicators;
    }
    public override bool CanWrite
    {
        get { return false; }
    }
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}

要使用转换器，请在这样的ClimateIndicators类中添加[JsonConverter]属性：

    [JsonConverter(typeof(ClimateIndicatorsConverter))]
    public class ClimateIndicators
    {
        ...
    }

请注意，您不需要ClimateIndicators或Atmospheric类中属性上的 [JsonProperty]属性，因为属性映射是由转换器处理的。

这是一个工作演示：https：//dotnetfiddle.net/fc9g69