Json 反序列化不适用于 Flurl

Question

我尝试使用来自网站的 json APIwith Flurl，但出现解析错误或转换错误。我不确定我的问题是什么，因为这是我第一次处理 json 文件。我利用以下在线 tool 从 json 文件中创建一个 C# 对象。但是当我尝试使用 Flurl 获得响应时，出现以下错误。

System.AggregateException: One or more errors occurred. ---> Flurl.Http.FlurlParsingException: Response could not be deserialized to JSON: GET ---> Newtonsoft.Json.JsonSerializationException: Error converting value "{"Group":[{"name":"Senior","id":1},{"name":"Age","id":1}],"Area":[{"AreaID":58,"Description":"Years 2018-19","Week":1150,"taken":true,"LDate":null","Label":"RED"}]

Path '', line 1, position 4814377. ---> System.ArgumentException: Could not cast or convert from System.String to System.Collections.Generic.List`1[JsonTest.SeatTest].

这是失败的代码块：

var response = await url.WithHeaders(new
    User_Agent = ConstantData.UserAgent,
    Accept = Accept,
    Referer = Referer})
    ..GetJsonAsync<List<SeatTest>>()
    .Result;

但现在如果我使用以下内容：

var response = await url.WithHeaders(new
    User_Agent = ConstantData.UserAgent,
    Accept = Accept,
    Referer = Referer})
    .GetStringAsync()
    .Result;

当我快速查看或将鼠标悬停在响应变量上时，我得到（我认为这是正常的，不确定）以下字符串。

"\"{\"Group\":[{\"name\":\"Senior\",\"id\":1},{\"name\":\"Age\",\"id\":1}],\"Area\":[{\"AreaID\":58,\"Description\":\"Years 2018-19\",\"Week\":1150,\"taken\":true,\"LDate\":null",\"Label\":\"RED\"}]

如果我应用以下内容：

var json = JsonConvert.DeserializeObject<SeatTest>(response);

它还会抛出我已经 post.

的异常

或

如果我跳过上面的行并执行以下操作：

var jSerial = new JavaScriptSerializer();
jSerial.MaxJsonLength = 50000000;
string jsonStr = jSerial.Deserialize<string>(response); 
var data = jSerial.Deserialize<SeatTest>(jsonStr);

我的 class 对象显示为空。但是我没有收到任何错误或异常。

我正在使用的 Flurl 代码如下所示，或者至少是我想使用的代码：

 var response = url.WithHeaders(new
                {
                    User_Agent = ConstantData.UserAgent,
                    Accept = Accept,
                    Referer = Referer
                })
                    .GetJsonAsync<List<SeatTest>>()
                    .Result;

我的对象模型如下所示：

public class SeatTest
    {
        [JsonProperty(PropertyName ="Group")]
        public List<Group> groups { get; set; }
        [JsonProperty(PropertyName = "Area")]
        public List<Group> areas { get; set; }
     }

 [Serializable]
    public class Group
    {
        public string name { get; set; }
        public int id { get; set; }

    }

 [Serializable]
 public class Area
    {
        public int AreaID{ get; set; }
        public string Description { get; set; }
        public int Week { get; set; }
        public bool Taken { get; set; }
        public DateTime LDate { get; set; }
        public string Label { get; set; }
    }

我希望一个对象充满了来自 API 的数据，但我得到了异常：

System.AggregateException: One or more errors occurred. ---> Flurl.Http.FlurlParsingException: Response could not be deserialized to JSON: GET ---> Newtonsoft.Json.JsonSerializationException: Error converting value "{"Group":[{"name":"Senior","id":1},{"name":"Age","id":1}],"Area":[{"AreaID":58,"Description":"Years 2018-19","Week":1150,"taken":true,"LDate":null","Label":"RED"}]

Path '', line 1, position 4814377. ---> System.ArgumentException: Could not cast or convert from System.String to System.Collections.Generic.List`1[JsonTest.SeatTest].

编辑

var jSerial = new JavaScriptSerializer();
jSerial.MaxJsonLength = 50000000;
string jsonStr = jSerial.Deserialize<string>(response); 
/*First pass: Here I already got the info that I need, how I map it to my class?, since I would like to use Flurl GetAsync() and map it to my object and not a string */
/*Above line response val:  "\{\\"Group\\":[{\\"name\\":\\"Senior\\",\\"id\\":1},{\\"name\\":\\"Age\\",\\"id\\":2}],\\"Area\\":[{\\"AreaID\\":58,\\"Description\\":\\"Season 2018-2019\\",\\"Week\\":1150,\\"taken\\":true,\\"LDate\\":\\"2019-07-07T00:00:00\\",\\"Label\\":\\"RED\\"}]} */
/*Above line jsonStr val: null*/

var data = jSerial.Deserialize<SeatTest>(jsonStr);
/*Above line jsonStr val same as raw in postman:  "\{\"Group\":[{\"name\":\"Senior\",\"id\":1},{\"name\":\"Age\",\"id\":2}],\"Area\":[{\"AreaID\":58,\"Description\":\"Season 2018-2019\",\"Week\":1150,\"taken\":true,\"LDate\":\"2019-07-07T00:00:00\",\"Label\":\"RED\"}]} */
/* data value after above line: Group: null, Area: null*/

原始邮递员Json

{
   \"Group\": [
        {
            \"name\": \"Senior\",
            \"id\": 1
        },
        {
            \"name\": \"Adult\",
            \"id\": 2
        }
    ],
    \"Area\": [
        {
            \"AreaID\": 58,
            \"Description\": \"Area 2018-2019\",            
            \"Week\": 1150,
            \"taken\": true,
            \"LDate\": \"2019-07-07T00:00:00\",
            \"Label\": \"RED\"
        },
        {
            \"SeasonID\": 57,
            \"Description\": \"Area 51\",           
            \"Week\": 1,
            \"taken\": true,
            \"LDate\": \"2019-07-015T00:00:00\",
            \"Label\": \"GREEN\"
        }]
}

Json 还有 JsonStr（第一关）在快速观看中的样子

{
   "Group": [
        {
            "name": "Senior",
            "id": 1
        },
        {
            "name": "Adult",
            "id": 2
        }
    ],
    "Area": [
        {
            "AreaID": 58,
            "Description": "Area 2018-2019",            
            "Week": 1150,
            "taken": true,
            "LDate": "2019-07-07T00:00:00",
            "Label": "RED"
        },
        {
            "SeasonID": 57,
            "Description": "Area 51",           
            "Week": 1,
            "taken": true,
            "LDate": "2019-07-015T00:00:00",
            "Label": "GREEN"
        }]
}

Answer 1

我们来看错误信息：

Path '', line 1, position 4814377. ---> System.ArgumentException: Could not cast or convert from System.String to System.Collections.Generic.List`1[JsonTest.SeatTest].

这是在告诉您 JSON 响应中的某处（确切地说是在第 4,814,377 个字符处），在 array 预期的位置有一个字符串。您似乎希望 "Group" 和 "Area" 属性都是 JSON 中的数组，但在响应的深处至少其中一个是字符串。

解决此问题的一种方法是将响应字符串解析为 JArray 并逐个构建强类型列表，同时处理解析错误：

var results = new List<SeatTest>();

var arr = JArray.Parse(response);
foreach (var obj in arr) {
    try {
        var seat = obj.ToObject<SeatTest>();
        results.Add(seat);
    }
    catch (Exception ex) {
        // parsing error, inspect ex and obj.ToString(). log? ignore?
    }
}

Json 反序列化不适用于 Flurl

Json Deserialization is not working with Flurl

c#

json

rest

javascriptserializer

flurl

或

编辑

原始邮递员Json

Json 还有 JsonStr（第一关）在快速观看中的样子