在 C# 中反序列化嵌套 JSON 数组时出现问题

Question

编辑我注意到这得到了反对票，我想这是因为没有展示研究成果。我看过很多堆栈溢出帖子。我找不到 JSON 这个重度嵌套的示例，该示例已通过示例访问 JSON 中存储的数据之后如何被操纵。

问题与目标

使用 restsharp，我收到了对我发出的 API 调用的 JSON 响应，但是我正在努力反序列化我收到的响应。我要使用的数据似乎是一个嵌套数组（下图）。

我的目标是将该数组的内容传递给一个变量，检查它是否已填充，获取该数组的第一项，然后将该项中的属性设置为等于我数据库中的对象。

这是我在使用当前代码时收到的错误消息。似乎我将 Hit 对象视为错误类型的对象，但是在用头撞墙几个小时后，我不完全确定为什么这对这个特定的对象不起作用 JSON结构。

当前代码

                    var hitresult = JsonConvert.DeserializeObject( response.Content, typeof( List<Hit> ) ) as List<Hit>;
                    if (hitresult.Any())
                    {
                            var address = hitresult.FirstOrDefault();
                            verified = true;
                            result = string.Format( "UDPRN: {0}", address.udprn ); 
                            location.Street1 = address.line_1;
                            location.Street2 = address.line_2;
                            location.City = address.post_town;
                            location.State = address.county;
                            location.PostalCode = address.postcode;

错误信息

An exception of type 'Newtonsoft.Json.JsonSerializationException' occurred in Newtonsoft.Json.dll but was not handled in user code

Additional information: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[org.hopecorby.LocationService.Hit]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.

To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.

Path 'result', line 1, position 10.

示例JSON

 {
    "result": {
        "total": 2,
        "limit": 10,
        "page": 0,
        "hits": [
            {
                "dependant_locality": "",
                "postcode_type": "L",
                "po_box": "",
                "post_town": "LONDON",
                "delivery_point_suffix": "1A",
                "double_dependant_locality": "",
                "su_organisation_indicator": " ",
                "longitude": -0.127695242183412,
                "department_name": "",
                "district": "Westminster",
                "building_name": "",
                "dependant_thoroughfare": "",
                "northings": 179951,
                "premise": "10",
                "postcode_outward": "SW1A",
                "postcode_inward": "2AA",
                "sub_building_name": "",
                "eastings": 530047,
                "postcode": "SW1A 2AA",
                "country": "England",
                "udprn": 23747771,
                "line_3": "",
                "organisation_name": "Prime Minister & First Lord Of The Treasury",
                "ward": "St James's",
                "county": "",
                "line_1": "Prime Minister & First Lord Of The Treasury",
                "building_number": "10",
                "thoroughfare": "Downing Street",
                "line_2": "10 Downing Street",
                "latitude": 51.5035398826274
            },
            {
                "dependant_locality": "",
                "postcode_type": "S",
                "po_box": "",
                "post_town": "LONDON",
                "delivery_point_suffix": "1B",
                "double_dependant_locality": "",
                "su_organisation_indicator": " ",
                "longitude": -0.122624730080001,
                "department_name": "",
                "district": "Camden",
                "building_name": "Downing Court",
                "dependant_thoroughfare": "",
                "northings": 182178,
                "premise": "Flat 10, Downing Court",
                "postcode_outward": "WC1N",
                "postcode_inward": "1LX",
                "sub_building_name": "Flat 10",
                "eastings": 530342,
                "postcode": "WC1N 1LX",
                "country": "England",
                "udprn": 26245117,
                "line_3": "Grenville Street",
                "organisation_name": "",
                "ward": "Bloomsbury",
                "county": "",
                "line_1": "Flat 10",
                "building_number": " ",
                "thoroughfare": "Grenville Street",
                "line_2": "Downing Court",
                "latitude": 51.5234851731108
            }
        ]
    },
    "code": 2000,
    "message": "Success"
}

我的模型（使用 json2charp 创建）

public class Hit
{
    public string dependant_locality { get; set; }
    public string postcode_type { get; set; }
    public string po_box { get; set; }
    public string post_town { get; set; }
    public string delivery_point_suffix { get; set; }
    public string double_dependant_locality { get; set; }
    public string su_organisation_indicator { get; set; }
    public double longitude { get; set; }
    public string department_name { get; set; }
    public string district { get; set; }
    public string building_name { get; set; }
    public string dependant_thoroughfare { get; set; }
    public int northings { get; set; }
    public string premise { get; set; }
    public string postcode_outward { get; set; }
    public string postcode_inward { get; set; }
    public string sub_building_name { get; set; }
    public int eastings { get; set; }
    public string postcode { get; set; }
    public string country { get; set; }
    public int udprn { get; set; }
    public string line_3 { get; set; }
    public string organisation_name { get; set; }
    public string ward { get; set; }
    public string county { get; set; }
    public string line_1 { get; set; }
    public string building_number { get; set; }
    public string thoroughfare { get; set; }
    public string line_2 { get; set; }
    public double latitude { get; set; }
}

public class Result
{
    public int total { get; set; }
    public int limit { get; set; }
    public int page { get; set; }
    public List<Hit> hits { get; set; }
}

public class RootObject
{
    public Result result { get; set; }
    public int code { get; set; }
    public string message { get; set; }
}

Answer 1

解串器需要一个 JSON 数组。您的 JSON 是一个包含 JSON 数组的 JSON 对象。反序列化器无法知道您希望它从 hits 数组开始工作。

您需要反序列化为 RootObject。然后您就可以将 List<Hit> 称为结果的属性。

更新：

下面的代码应该能让您明白我的意思。我测试了这个，它对我有用，你的对象和你的 JSON.

var sr = new StreamReader(@"C:\Users\danielc\Documents\Visual Studio 2012\Projects\TestJSON\TestJSON\response.json");
string json = sr.ReadToEnd();
sr.Close();

var root = JsonConvert.DeserializeObject<RootObject>(json);
var result = root.result;
var hits = result.hits;

if (hits.Any())
{
    var address = hits.FirstOrDefault();
    var udprn = string.Format("UDPRN: {0}", address.udprn);
    Console.WriteLine(udprn);
}

Console.Read();

在 C# 中反序列化嵌套 JSON 数组时出现问题

Problems Deserializing Nested JSON Array in C#

c#

json

json.net

restsharp

问题与目标

当前代码

错误信息

示例JSON

我的模型（使用 json2charp 创建）