如何修复错误:JsonSerializationException:不能反序列化当前JSON对象 &

Question

正文如下:

{
"_total": 3,
"users": [
{
"username": "person1",
"points": 3
},
{
"username": "person2",
"points": 2
},
{
"username": "person3",
"points": 1
}
]
}

代码:

public class UserData
{
public string username { get; set; }
public int points { get; set; }
}

using (var response = await client.SendAsync(request))
{
response.EnsureSuccessStatusCode();
var body = await response.Content.ReadAsStringAsync();
var data = JsonConvert.DeserializeObject<List<UserData>>(body); 
foreach (UserData userdata in data) 
{
Debug.Log(userdata.username + ": " + userdata.points);
}
}

错误:

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

要修复此错误，要么将JSON更改为JSON数组(例如[1,2,3])，要么更改反序列化类型，使其成为可以从JSON对象反序列化的普通。net类型(例如，不是像整数这样的原始类型，也不是像数组或列表这样的集合类型)。还可以将JsonObjectAttribute添加到类型中，以强制它从JSON对象进行反序列化。

Answer 1

类与JSON结构不匹配，因此您将获得JsonSerializationExceptionException。
你的模型应该看起来像这样:

public class RootClass
{
public int _total { get; set; }
public List<User> users { get; set; }
}
public class User
{
public string username { get; set; }
public int points { get; set; }
}

你可以这样做:

using (var response = await client.SendAsync(request))
{
response.EnsureSuccessStatusCode();
var body = await response.Content.ReadAsStringAsync();
var data = JsonConvert.DeserializeObject<RootClass>(body); 
foreach (User userdata in data.users) 
{
Debug.Log(userdata.username + ": " + userdata.points);
}
}

Answer 2

您可以先解析json字符串，然后将其反序列化为UserData列表

var data = JObject.Parse(body)["users"].ToObject<List<UserData>>();