VB.net 中 json.net 的简单工作示例 [英] Simple working Example of json.net in VB.net

问题描述

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！

I have the following simplified JSON string from a provider, its been a long time since I used Visual Studio and vb.Net, so I'm very rusty!

{
"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 看起来像是答案，但我无处可去.

I want to use JSON.Net to turn this in to something I can work with, I have read examples etc and JSON.net looks like the answer, but I'm getting no where.

我的 .Net 代码(Me.TextBox1.Text 包含上面显示的 JSON)

My .Net code (Me.TextBox1.Text contains the JSON shown above)

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，我需要做什么来解决这个问题，没有报告错误.

Can someone explain why obj.ID always ends up as 0 please, and why none of the other properties of my class are populated and what I need to do to fix this, no errors are reported.

推荐答案

您的类 JSON_result 与您的 JSON 字符串不匹配.请注意对象 JSON_result 将如何被包装在另一个名为 "Venue" 的属性中.

Your class JSON_result does not match your JSON string. Note how the object JSON_result is going to represent is wrapped in another property named "Venue".

因此要么为此创建一个类，例如:

So either create a class for that, e.g.:

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

or change your JSON string to

{
    "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"
    }
}

或使用例如一个 ContractResolver 来解析 JSON 字符串.

or use e.g. a ContractResolver to parse the JSON string.

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