Question

我很擅长操纵通过API检索的JSON格式数据。我使用JSON.NET来实现deserealize，对于大多数JSON格式数据，它可以工作，但是，当我尝试以JSON格式从ETSY检索数据时，它会出错...

Unexpected JSON token while reading DataTable: StartObject

这是我试图进入数据表的JSON数据......它是来自ETSY帐户的样本数据。

{
    "count":1,
    "results": [{
        "user_id":5029420,
        "login_name":"EtsyStore",
        "creation_tsz":1282269739,
        "referred_by_user_id":null,
        "feedback_info": {
            "count":3038,
            "score":100
        }
    }],
    "params": {
        "user_id":"etsystore"
    },
    "type":"User",
    "pagination":{}
}

这是我目前的代码......

Dim webClient As New System.Net.WebClient
Dim json As String = webClient.DownloadString("https://openapi.etsy.com/v2/users/etsystore?api_key=apikey")
Dim table As DataTable = JsonConvert.DeserializeObject(Of DataTable)(json)
DataGridView1.DataSource = table

有人可以帮我解决这个问题吗？非常感谢你。

Answer 1

为了反序列化为DataTable或DataSet，Json.Net需要一种非常具体的格式，如example from the documentation所示。您的JSON不符合此格式，因此它不起作用。这并不意味着您不能使用Json.Net，它只是意味着您需要选择其他方式来反序列化。

一种方法是创建强类型类，并反序列化为：

Public Class RootObject
    Public Property count As Integer
    Public Property results As List(Of Result)
    Public Property params As Params
    Public Property type As String
    Public Property pagination As Pagination
End Class

Public Class Result
    Public Property user_id As Integer
    Public Property login_name As String
    Public Property creation_tsz As Integer
    Public Property referred_by_user_id As Object
    Public Property feedback_info As FeedbackInfo
End Class

Public Class FeedbackInfo
    Public Property count As Integer
    Public Property score As Integer
End Class

Public Class Params
    Public Property user_id As String
End Class

Public Class Pagination
End Class

然后：

Dim root As RootObject = JsonConvert.DeserializeObject(Of RootObject)(json)

另外，您可以反序列化为JObject并使用Json.Net的LINQ-to-JSON API来导航和提取所需的数据。以下an example可能对此有所帮助。文档中还有许多其他示例以及StackOverflow。

JSON格式反序列化错误.NET

1 个答案: