Json反序列化不适用于Flurl [英] Json Deserialization is not working with Flurl
问题描述
我尝试从网站上使用Flurl使用json API，但遇到解析错误或转换错误.我不确定是什么问题，因为这是我第一次处理json文件.我利用以下在线工具在其中创建了一个C#对象json文件.但是，当我尝试通过Flurl获得响应时，会出现以下错误.
I try to consume an json APIwith Flurl from a website and I'm getting parse errors or conversion errors. I'm not sure what is my problem since is the first time I deal with json files. I utilize the following online tool to create a C# object out of the json file. But when I try to get a response with Flurl I get the following errors.
System.AggregateException:发生一个或多个错误. ---> Flurl.Http.FlurlParsingException:无法反序列化响应 到JSON:GET ---> Newtonsoft.Json.JsonSerializationException:转换值时出错 "{" Group:[{" name:" Senior，" id:1}，{" name:" Age，" id:1}]，" Area:[{" AreaID: 58，描述":年份 2018-19，" Week:1150，" taked:true，" LDate:null"，"Label":"RED"}]
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"}]
路径''，第1行，位置4814377.---> System.ArgumentException:无法将System.String强制转换或转换为 System.Collections.Generic.List`1 [JsonTest.SeatTest].
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;
但是现在，如果我使用以下内容:
But now if I use the following:
var response = await url.WithHeaders(new
User_Agent = ConstantData.UserAgent,
Accept = Accept,
Referer = Referer})
.GetStringAsync()
.Result;
快速查看或将鼠标悬停在响应变量上时，会得到以下字符串(我认为这是正常的，不确定).
I get (which I think is normal, not sure) the following string when I do a quick watch or hover over the response variable.
"\" {\\"Group \\":[{\\"name \\":\\"Senior \\"，\\"id \\":1}，{\\"name \ \:\\" Age \\，\\" id \\:1}]，\\" Area \\:[{\\" AreaID \\:58，\\" Description \\":\\年 2018-19 \\，\\" Week \\:1150，\\" taken \\:true，\\" LDate \\:null"，\\"Label \\":\\"RED \\}]
"\"{\\"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);
它还会抛出我已经发布的异常.
it will also throw the exception that I already post.
如果我跳过上面的行并执行以下操作:
If I skip the above line and do the following:
var jSerial = new JavaScriptSerializer();
jSerial.MaxJsonLength = 50000000;
string jsonStr = jSerial.Deserialize<string>(response);
var data = jSerial.Deserialize<SeatTest>(jsonStr);
我的班级对象显示为空.但是我没有任何错误或异常.
My class objects appear null. But I don't get any errors or exceptions.
我正在使用的Flurl代码如下所示，或者至少是我想利用的代码:
The that Flurl code that I'm using looks like follow, or at least the one I want to utilize:
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:
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; }
}
我希望有一个对象，该对象充满了来自API的数据，但是却出现了异常:
I expect an object that is filled with the data that comes from the API, but instead I get exceptions:
System.AggregateException:发生一个或多个错误. ---> Flurl.Http.FlurlParsingException:无法反序列化响应 到JSON:GET ---> Newtonsoft.Json.JsonSerializationException:转换值时出错 "{" Group:[{" name:" Senior，" id:1}，{" name:" Age，" id:1}]，" Area:[{" AreaID: 58，描述":年份 2018-19，" Week:1150，" taked:true，" LDate:null"，"Label":"RED"}]
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"}]
路径''，第1行，位置4814377.---> System.ArgumentException:无法将System.String强制转换或转换为 System.Collections.Generic.List`1 [JsonTest.SeatTest].
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*/
原始邮递员杰森
{
\"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以及JsonStr(首过)在快速观看中的外观
{
"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"
}]
}
推荐答案
让我们看看错误消息:
路径"，第1行，位置4814377.---> System.ArgumentException: 无法将System.String强制转换或转换为 System.Collections.Generic.List`1 [JsonTest.SeatTest].
Path '', line 1, position 4814377. ---> System.ArgumentException: Could not cast or convert from System.String to System.Collections.Generic.List`1[JsonTest.SeatTest].
这是告诉您JSON响应中的某个位置(确切地说是第4,814,377个字符)，在数组中应有一个字符串.似乎您希望"Group"和"Area"属性在JSON中都是数组，但是在响应的最下方某个位置至少有一个是字符串.
This is telling you that somewhere in the JSON response (at the 4,814,377th character to be exact), there's a string where in array is expected. It appears that you're expecting both "Group" and "Area" properties to be arrays in the JSON, but somewhere deep down in the response at least one of them is a string.
解决此问题的一种方法是将响应字符串解析为JArray并一个接一个地构建强类型列表，并一路处理解析错误:
One way to work around this is to parse the response string to a JArray and build your strongly-typed list one by one, handling parsing errors along the way:
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?
}
}
这篇关于Json反序列化不适用于Flurl的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
