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[英]Cannot deserialize the current JSON object (e.g. {“name”:“value”})
[英]Deserilizing the json to list of an object throwing error. Cannot deserialize the current JSON object (e.g. {"name":"value"})
我正在嘗試反序列化 Json 以列出 StudentName 和 studentId 的 object。 我確實得到了大約 200 名學生的 jsonResponse,但是當我開始反序列化時,我得到了以下錯誤。 我對此錯誤進行了研究,該問題的修復與我擁有的代碼相似,因此我不確定出了什么問題。
Cannot deserialize the current JSON object (eg {"name":"value"}) into type 'System.Collections.Generic.List`1[MyApp.Models.Student]' because the type requires a JSON array (eg [1, 2,3]) 正確反序列化。
public static async Task<List<Student>> GetUserInfo()
{
var token = await AccessToken.GetGraphAccessToken();
// Construct the query
HttpClient client = new HttpClient();
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, Globals.MicrosoftGraphUsersApi);
request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
// Ensure a successful response
HttpResponseMessage response = await client.SendAsync(request);
response.EnsureSuccessStatusCode();
// Populate the data store with the first page of groups
string jsonResponse = await response.Content.ReadAsStringAsync();
var students = JsonConvert.DeserializeObject<List<Student>>(jsonResponse);
return students;
}
以下是來自 Microsoft Graph Api 的 JSON 響應
{
"@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users(studentName,studentId)",
"value": [
{"studentName":"Radha,NoMore","studentId":"420"},
{"studentName":"Victoria, TooMuch","studentId":"302"}
]
}
C# 學生 Class:
public class Student
{
public string studentName { get; set; }
public string studentId { get; set; }
}
JSON 響應包含一個value:
屬性,該屬性包含學生作為數組數據。 因此,您需要額外創建一個具有List<Student> value
屬性的 class,反序列化為該 class,然后您可以使用value
屬性中的學生列表,如下所示:
var listHolder = JsonConvert.DeserializeObject<StudentListHolder>(jsonResponse);
var list = listHolder.value;
foreach (var student in list)
{
Console.WriteLine(student.studentId + " -> " + student.studentName);
}
這是額外的 class:
public class StudentListHolder // pick any name that makes sense to you
{
public List<Student> value { get; set; }
}
工作演示(.NET Fiddle): https://dotnetfiddle.net/Lit6Er
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