使用Json.NET反序列化键值对的数组

时间:2013-04-03 14:02:02

标签: c# json.net deserialization

鉴于以下json:

[ {"id":"123", ... "data":[{"key1":"val1"}, {"key2":"val2"}], ...}, ... ]

是更大树的一部分,如何将“data”属性反序列化为:

List<MyCustomClass> Data { get; set; }

List<KeyValuePair> Data { get; set; }

Dictionary<string, string> Data { get; set; }

使用Json.NET?两个版本都可以(我更喜欢List of MyCustomClass)。我已经有一个包含其他属性的类,如下所示:

public class SomeData
{
   [JsonProperty("_id")]
   public string Id { get; set; }
   ...
   public List<MyCustomClass> Data { get; set; }
}

其中“MyCustomClass”只包含两个属性(Key和Value)。我注意到有一个KeyValuePairConverter类听起来像它会做我需要的,但我无法找到如何使用它的例子。谢谢。

4 个答案:

答案 0 :(得分:18)

最简单的方法是将键值对数组反序列化为IDictionary<string, string>


public class SomeData
{
    public string Id { get; set; }

    public IEnumerable<IDictionary<string, string>> Data { get; set; }
}

private static void Main(string[] args)
{
    var json = "{ \"id\": \"123\", \"data\": [ { \"key1\": \"val1\" }, { \"key2\" : \"val2\" } ] }";

    var obj = JsonConvert.DeserializeObject<SomeData>(json);
}

但是如果你需要将它反序列化到你自己的类中,它可能看起来像这样:


public class SomeData2
{
    public string Id { get; set; }

    public List<SomeDataPair> Data { get; set; }
}

public class SomeDataPair
{
    public string Key { get; set; }

    public string Value { get; set; }
}

private static void Main(string[] args)
{
    var json = "{ \"id\": \"123\", \"data\": [ { \"key1\": \"val1\" }, { \"key2\" : \"val2\" } ] }";

    var rawObj = JObject.Parse(json);

    var obj2 = new SomeData2
    {
        Id = (string)rawObj["id"],
        Data = new List<SomeDataPair>()
    };

    foreach (var item in rawObj["data"])
    {
        foreach (var prop in item)
        {
            var property = prop as JProperty;

            if (property != null)
            {
                obj2.Data.Add(new SomeDataPair() { Key = property.Name, Value = property.Value.ToString() });
            }

        }
    }
}

看到我说Valuestring并且我调用了ToString()方法,可能会有另一个复杂的类。

答案 1 :(得分:2)

我最终这样做了:

[JsonConverter(typeof(MyCustomClassConverter))]
public class MyCustomClass
{
  internal class MyCustomClassConverter : JsonConverter
  {
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
      throw new NotImplementedException();
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
      JObject jObject = JObject.Load(reader);

      foreach (var prop in jObject)
      {
        return new MyCustomClass { Key = prop.Key, Value = prop.Value.ToString() };
      }

      return null;
    }

    public override bool CanConvert(Type objectType)
    {
      return typeof(MyCustomClass).IsAssignableFrom(objectType);
    }
  }

  public string Key { get; set; }
  public string Value { get; set; }
}

答案 2 :(得分:0)

public class Datum
{
    public string key1 { get; set; }
    public string key2 { get; set; }
}

public class RootObject
{
    public string id { get; set; }
    public List<Datum> data { get; set; }
}

我也使用了此向导json2csharp.com来生成反序列化的类

使用该

using RestSharp;
using Newtonsoft.Json;

IRestResponse restSharp= callRestGetMethodby_restSharp(api_server_url);
string jsonString= restSharp.Content;

RootObject rootObj= JsonConvert.DeserializeObject<RootObject>(jsonString);
return Json(rootObj);

如果您通过restsharp呼叫休息

    public IRestResponse callRestGetMethodby_restSharp(string API_URL)
    {
        var client = new RestSharp.RestClient(API_URL);
        var request = new RestRequest(Method.GET);
        request.AddHeader("Content-Type", "application/json");
        request.AddHeader("cache-control", "no-cache");
        IRestResponse response = client.Execute(request);
        return response;
    }

您还可以从getpostman.com工具中获得这6行restsharp

答案 3 :(得分:0)

感谢@Boo的回答,但就我而言,我需要进行一些小的调整。 这是我的JSON的样子:

{
    "rates": {
        "CAD": 1.5649,
        "CZK": 26,118,
        ...
    },
    "base": "EUR",
    "date": "2020-08-16"
}

我的DTO如下所示:

public IDictionary<string, decimal> Rates { get; set; }
public string Base { get; set; }
public DateTime Date { get; set; }

因此唯一的调整是删除IEnumerable周围的IDictionary