处理JSON单个对象和数组

时间:2017-05-21 18:28:15

标签: c# arrays json json.net

我正在使用Newtonsoft.Json处理一些返回给我的JSON数据。根据我的要求,我可以得到一些看起来像的东西:

{
"TotalRecords":2,
"Result":
    [
        {
        "Id":24379,
        "AccountName":"foo"
        },
        {
        "Id":37209,
        "AccountName":"bar"
        }
    ],
"ResponseCode":0,
"Status":"OK",
"Error":"None"
}

{
    "Result":
    {
        "Id":24379,
        "AccountName":"foo"
    },
    "ResponseCode":0,
    "Status":"OK",
    "Error":"None"
}

因此,有时“结果”是结果数组,或者“结果”可能是单个响应。

我尝试使用How to handle both a single item and an array for the same property using JSON.net的答案,但我仍然遇到错误。

特别是我得到了

Newtonsoft.json.jsonSerializationException: 'Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List'...

自定义转换器如下所示:

public class SingleOrArrayConverter<T> : JsonConverter
    {
        public override bool CanConvert(Type objecType)
        {
            return (objecType == typeof(List<T>));
        }

        public override object ReadJson(JsonReader reader, Type objecType, object existingValue,
            JsonSerializer serializer)
        {
            JToken token = JToken.Load(reader);
            if (token.Type == JTokenType.Array)
            {
                return token.ToObject<List<T>>();
            }
            return new List<T> { token.ToObject<T>() };
        }

        public override bool CanWrite
        {
            get { return false; }
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            throw new NotImplementedException();
        }
    }

我的回复类看起来像

public class TestResponse
    {
        [JsonProperty("Result")]
        [JsonConverter(typeof(SingleOrArrayConverter<string>))]
        public List<DeserializedResult> Result { get; set; }
    }
public class DeserializedResult
    {
        public string Id { get; set; }
        public string AccountName { get; set; }
    }

最后我的请求看起来像

List<TestResponse> list = JsonConvert.DeserializeObject<List<TestResponse>>(response.Content);

2 个答案:

答案 0 :(得分:9)

您的代码很好,只需要进行一些类型调整。

这一行

List<TestResponse> list = JsonConvert.DeserializeObject<List<TestResponse>>(response.Content);

需要像这样,因为您的回复是object,而不是List

TestResponse list = JsonConvert.DeserializeObject<TestResponse>(response);

然后是您的自定义反序列化器属性:

[JsonConverter(typeof(SingleOrArrayConverter<string>))]

需要成为:

[JsonConverter(typeof(SingleOrArrayConverter<DeserializedResult>))]

因为Result对象不是stringstring数组,所以它是DeserializedResultDeserializedResult的数组。< / p>

答案 1 :(得分:0)

我认为,没有办法强调你应该采取何种类型的回应。这就是为什么我建议检查manualy类型的响应:

using System;
using System.Collections.Generic;
using Newtonsoft.Json;

namespace TestConsoleApp
{
    public class Class1
    {

        public class Result
        {
            public int Id { get; set; }
            public string AccountName { get; set; }
        }

        public class ModelWithArray
        {
            public int TotalRecords { get; set; }
            public List<Result> Result { get; set; }
            public int ResponseCode { get; set; }
            public string Status { get; set; }
            public string Error { get; set; }
        }

        public class Result2
        {
            public int Id { get; set; }
            public string AccountName { get; set; }
        }

        public class ModelWithoutArray
        {
            public Result2 Result { get; set; }
            public int ResponseCode { get; set; }
            public string Status { get; set; }
            public string Error { get; set; }
        }

        public static void Main(params string[] args)
        {
            //string json = "{\"TotalRecords\":2,\"Result\":[{\"Id\":24379,\"AccountName\":\"foo\"},{\"Id\":37209,\"AccountName\":\"bar\"}], \"ResponseCode\":0,\"Status\":\"OK\",\"Error\":\"None\"}";
            string json = "{\"Result\":{\"Id\":24379,\"AccountName\":\"foo\"},\"ResponseCode\":0,\"Status\":\"OK\",\"Error\":\"None\"}";

            if (checkIsArray(json))
            {
                ModelWithArray data = JsonConver.DeserializeObject<ModelWithArray >(json);
            }else
            {
                ModelWithoutArray data = JsonConver.DeserializeObject<ModelWithoutArray>(json);
            }

        }

        static bool checkIsArray(string json)
        {

            Dictionary<string, object> desData = JsonConvert.DeserializeObject<Dictionary<string, object>>(json);

            if (desData["Result"].GetType().Name.Contains("Array"))
            {
                return true;
            }
            else
            {
                return false;
            }

        }

    }
}