json - VB.net 中 json.net 的简单工作示例

Question

我有以下来自提供者的简化 JSON 字符串，自从我使用 Visual Studio 和 vb.Net 已经很长时间了，所以我很生疏!

{
"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 把它变成我可以使用的东西，我已经阅读了示例等，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

有人可以解释为什么 obj.ID 总是以 0 结束，为什么我的类的其他属性都没有被填充，以及我需要做什么来解决这个问题，没有报告错误。

Answer 1

您的类(class) JSON_result与您的 JSON 字符串不匹配。注意对象 JSON_result将代表被包裹在另一个名为 "Venue" 的属性中.

所以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...)

或将您的 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ContractResolver解析 JSON 字符串。