反序列化JSON数组与列表

如何解决反序列化JSON数组与列表

所以我正在使用以下myMarketNews api：https://mymarketnews.ams.usda.gov/mars-api/getting-started

我可以使用以下代码自己提取报告列表：

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

namespace MarketNewsJson
{
    internal static class MarketNewsJson
    {
        private static void Main(string[] args)
        {
            var client = new RestClient("https://marsapi.ams.usda.gov")
            {
                Authenticator = new HttpBasicAuthenticator("mars_test_343343","")
            };

            var request = new RestRequest("services/v1.1/reports",DataFormat.Json);
            var response = client.Get(request);

            var reports = JsonConvert.DeserializeObject<List<Report>>(response.Content);
            foreach (var report in reports)
            {
                Console.WriteLine($"{report.SlugId} {report.SlugName} - {report.ReportTitle}");
            }
        }
    }

    public class Report
    {
        [JsonProperty("slug_id")]
        public string SlugId { get; set; }

        [JsonProperty("slug_name")]
        public string SlugName { get; set; }

        [JsonProperty("report_title")]
        public string ReportTitle { get; set; }

        [JsonProperty("published_date")]
        public string PublishedDate { get; set; }

        [JsonProperty("markets")]
        public List<string> Markets { get; set; }

        [JsonProperty("market_types")]
        public List<string> MarketTypes { get; set; }

        [JsonProperty("offices")]
        public List<string> Offices { get; set; }

        [JsonProperty("sectionNames")]
        public List<string> SectionNames { get; set; }
    }
}

这将拉出报告名称及其其他属性。但是，我也希望能够为单个报告本身提取JSON信息。我在“排序”选项卡中注意到，它显示了单个报告的属性，并且用于指定单个报告的属性类似于var request = new RestRequest（“ services / v1.1 / reports / 1095”，DataFormat.Json ）;报告1095本身，而不是所有报告的/ reports。当我这样做时，反序列化时出现错误：

Newtonsoft.Json.JsonSerializationException：'无法反序列化当前JSON对象（例如{“ name”：“ value”}）为类型'System.Collections.Generic.List`1 [MarketNewsJson.Report]'，因为该类型需要JSON数组（例如[1,2,3]）正确反序列化。

这是因为单个报告的JSON格式与报告列表本身的格式不同吗？如果是这样，我是否需要换行来对单个报告进行反序列化，而当我要获取单个报告及其属性时，仅将另一行注释掉？

编辑：JSON响应

这就是我当前仅提取报告名称，id和标题（正常工作）时的JSON响应：

[
   {
      "slug_id": "1034","slug_name": "MD_DA105","report_title": "Whey - Western & Eastern Europe Report","published_date": "07/30/2020 08:25:01","markets": ["N/A"],"market_types": ["Point of Sale"],"offices": ["Madison"],"sectionNames": []
    },{
         "slug_id": "1035","slug_name": "MD_DA106","report_title": "Skim Milk Powder - Europe","sectionNames": []
  }
]

从文档中可以看出，报告的单个数据应该是这样的：

{
  "results": [
    {
      "report_begin_date": "2018-01-08","report_end_date": "2018-01-08","published_date": "2018-01-31","office_name": "Madison","office_code": "DA-MD","office_city": "Madison","office_state": "WI","market_location_name": "National Cold Storage","market_location_city": "","market_location_state": "WI","group": null,"category": "Hard Products","commodity": "Cheese","market_type": "Cold Storage","market_type_category": "Dairy Market","slug_id": "1095","slug_name": "MD_DA953","community": "Dairy","quality": "N/A","holdings_unit": "LBS","holdings_current_lbs": "96009227","holdings_1stDayMTH_lbs": "96245049","holdings_change_lbs": "-235822","holdings_change_percent": "0.0000","currentMTH_1stDay": "2018-01-01","report_narrative": null,"commodity_narrative": null,"special_announcement": null
}

解决方法

您将必须使用两个不同的类。一个用于列表，另一个用于ReportObject。

对于services/v1.1/reports，您将需要使用帖子中已有的类。但是对于使用services/v1.1/reports/1095获得的报告，您将需要使用其他类来反序列化您的响应。这主要是因为您得到的响应与没有ID的报告大为不同。

public class ReportResultResponse {
    // This is a List of objects even though it might always be a single element in the json
    [JsonProperty("results")]
    public List<ReportResultForID> Results {get;set;}
}

public class ReportResultForID {
    [JsonProperty("report_begin_date")]
    public DateTime ReportBeginDate {get;set;}
    
    [JsonProperty("report_end_date")]
    public DateTime ReportEndDate {get;set;}
    ...

    [JsonProperty("slug_name")]
    public string SlugName {get;set;}
    ...
}

// Then for the reports you get with ID,you would deserialize like this,var request = new RestRequest("services/v1.1/reports/1095",DataFormat.Json);
var response = client.Get(request);
var reports = JsonConvert.DeserializeObject<ReportResultResponse>(response.Content);