Question

无法使用JsonConvert解析以下内容......

{
    "ico": {
        "upcoming": [
            {
                "name": "Crowdwiz",
                "image": "https://icowatchlist.com/logos/crowdwiz.png",
                "description": "CrowdWiz Bringing the future of investment into your hands",
                "website_link": "https://api.icowatchlist.com/public/v1/url/crowdwiz",
                "icowatchlist_url": "https://icowatchlist.com/ico/crowdwiz",
                "start_time": "2017-10-24 12:00:00",
                "end_time": "2017-11-07 12:00:00",
                "timezone": "UTC+0"
            },
            {
                "name": "Publica",
                "image": "https://icowatchlist.com/logos/publica.png",
                "description": "Blockchain revolution for the publishing economy",
                "website_link": "https://api.icowatchlist.com/public/v1/url/publica",
                "icowatchlist_url": "https://icowatchlist.com/ico/publica",
                "start_time": "2017-10-25 00:00:00",
                "end_time": "2017-11-15 00:00:00",
                "timezone": "UTC+3"
            }
        ]
    }
}

通常我会创建一个类;但无法弄清楚这种结构如何。这是我的代码（vb.net，但C＃解决方案很好）。任何帮助将不胜感激......

Try
    url = "https://api.icowatchlist.com/public/v1/upcoming"

    Dim theurl As New Uri(url)

    Using webClient = New System.Net.WebClient()
        json = webClient.DownloadString(theurl)
        Dim dataWrapper = JsonConvert.DeserializeObject(Of MarketWrapper)(json)

        For Each jobject In dataWrapper.ico

            Dim s As String = jobject.name
        Next
    End Using

Catch ex As Exception
    some_msg = ex.Message
End Try

我从asp.net得到的错误...

无法将当前JSON对象（例如{“name”：“value”}）反序列化为类型'System.Collections.Generic.List`1 [ping60 + DataWrapper]'，因为该类型需要JSON数组（例如[1] ，2,3]）正确反序列化。要修复此错误，请将JSON更改为JSON数组（例如[1,2,3]）或更改反序列化类型，使其成为普通的.NET类型（例如，不是像整数这样的基本类型，而不是类似的集合类型可以从JSON对象反序列化的数组或List。 JsonObjectAttribute也可以添加到类型中以强制它从JSON对象反序列化。路径'ico.upcoming'，第1行，第19位。

我所拥有的课程，尝试了其他选项，但仍然没有...

Class MarketWrapper
    Property ico As List(Of DataWrapper)
End Class

Class DataWrapper
    Property name As String
    Property image As String
    Property description As Single
    Property website_link As String
    Property icowatchlist_url As String
    Property start_time As String
    Property end_time As String
    Property timezone As String
End Class

@dbc解决方案有效。将此添加到我的代码中以循环通过ico list ...

For Each jobject In dataWrapper.ico.upcoming
   Dim s As String = jobject.name
Next

Answer 1

您可以使用代码生成工具（如https://jsonutils.com/或Paste JSON as Classes）从JSON自动生成VB.NET类。像这样的工具不能正确处理所有内容（例如字典），但在这种情况下，jsonutils可以正常工作并生成以下内容：

Public Class Upcoming
    Public Property name As String
    Public Property image As String
    Public Property description As String
    Public Property website_link As String
    Public Property icowatchlist_url As String
    Public Property start_time As String
    Public Property end_time As String
    Public Property timezone As String
End Class

Public Class Ico
    Public Property upcoming As List(Of Upcoming)
End Class

Public Class MarketWrapper
    Public Property ico As Ico
End Class

注意：

您需要在根对象Ico和MarketWrapper之间增加一级List(Of Upcoming)来捕获upcoming属性。
description必须是String而不是Single。
我确实将自动生成的Public Property upcoming As Upcoming()更改为List(Of Upcoming)类型。像这样的代码生成工具通常支持列表上的数组。

示例VB.NET fiddle。

无法使用JsonConvert解析奇怪的JSON对象

1 个答案: