VB.net中json.net的简单工作示例

Question

我从提供者那里得到了以下简化的JSON字符串，自从我使用Visual Studio和vb.Net以来已经有很长时间了，所以我很生锈！

{
"Venue": {
    "ID": 3145,
    "Name": "Big Venue, Clapton",
    "NameWithTown": "Big Venue, Clapton, London",
    "NameWithDestination": "Big Venue, Clapton, London",
    "ListingType": "A",
    "Address": {
        "Address1": "Clapton Raod",
        "Address2": "",
        "Town": "Clapton",
        "County": "Greater London",
        "Postcode": "PO1 1ST",
        "Country": "United Kingdom",
        "Region": "Europe"
    },
    "ResponseStatus": {
        "ErrorCode": "200",
        "Message": "OK"
    }
}
}

我想使用JSON.Net将其转换为我可以使用的东西，我已经阅读了示例等，并且JSON.net看起来像答案，但我无处可去。

我的.Net代码（Me.TextBox1.Text包含上面显示的JSON）

Imports Newtonsoft.Json

Public Class Form1

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Dim obj As JSON_result
    obj = JsonConvert.DeserializeObject(Of JSON_result)(Me.TextBox1.Text)

    MsgBox(obj.ID)
End Sub
End Class

Public Class JSON_result
    Public ID As Integer
    Public Name As String
    Public NameWithTown As String
    Public NameWithDestination As String
    Public ListingType As String
 End Class

有人可以解释一下为什么obj.ID总是以0结尾，为什么我的类的其他属性都没有填充，为什么我需要做些什么来解决这个问题，所以没有错误报告。

Answer 1

您的课程JSON_result与您的JSON字符串不匹配。请注意，该对象JSON_result将如何表示，并包装在另一个名为中的属性中"Venue"。

因此，要么为此创建一个类，例如：

Public Class Container
    Public Venue As JSON_result
End Class

Public Class JSON_result
    Public ID As Integer
    Public Name As String
    Public NameWithTown As String
    Public NameWithDestination As String
    Public ListingType As String
End Class

Dim obj = JsonConvert.DeserializeObject(Of Container)(...your_json...)

或将JSON字符串更改为

{
    "ID": 3145,
    "Name": "Big Venue, Clapton",
    "NameWithTown": "Big Venue, Clapton, London",
    "NameWithDestination": "Big Venue, Clapton, London",
    "ListingType": "A",
    "Address": {
        "Address1": "Clapton Raod",
        "Address2": "",
        "Town": "Clapton",
        "County": "Greater London",
        "Postcode": "PO1 1ST",
        "Country": "United Kingdom",
        "Region": "Europe"
    },
    "ResponseStatus": {
        "ErrorCode": "200",
        "Message": "OK"
    }
}

或使用例如a ContractResolver解析JSON字符串。