阅读 REST API JSON 回复

Question

我一直在网上来回搜索，但找不到解决我的问题的线索。

我正在通过 RestSharp Client 调用 REST API。我检索到这样的响应：

{
 "meta": {
  "query_time": 0.007360045,
  "pagination": {
   "offset": 1,
   "limit": 100,
   "total": 1
  },
  "powered_by": "device-api",
  "trace_id": "a0d33897-5f6e-4799-bda9-c7a9b5368db7"
 },
 "resources": [
  "1363bd6422274abe84826dabf20cb6cd"
 ],
 "errors": []
}

我现在想查询resources的值。这是我使用的代码：

Dim id_request = New RestRequest("/devices/queries/devices/v1?filter=" + filter, Method.GET)
id_request.AddHeader("Accept", "application/json")
id_request.AddHeader("Authorization", "bearer " + bearer)
Dim data_response = data_client.Execute(id_request)
Dim data_response_raw As String = data_response.Content
Dim raw_id As JObject = JObject.Parse(data_response_raw)
Dim id = raw_id.GetValue("resources").ToString

不幸的是，我只收到 ["1363bd6422274abe84826dabf20cb6cd"] 而不是 1363bd6422274abe84826dabf20cb6cd

的回复

谁能指出我正确的方向？

我也曾尝试使用 JsonConvert.DeserializeObject() 进行反序列化，但不知为何失败了。

我在这里找到了这个解决方案，但如果我尝试重建它会失败，因为它无法识别字典部分

 Dim tokenJson = JsonConvert.SerializeObject(tokenJsonString)
 Dim jsonResult = JsonConvert.DeserializeObject(Of Dictionary(Of String, Object))(jsonString)
 Dim firstItem = jsonResult.Item("data").Item(0)

编辑：

当尝试按照建议反序列化根时，但似乎第二个响应是嵌套的 JSON。

我有这样的回复：

dr = {
     "meta": {
      "query_time": 0.004813129,
      "powered_by": "device-api",
      "trace_id": "5a355c86-37f7-416d-96c4-0c8796c940fc"
     },
     "resources": [
      {
       "device_id": "1363bd6422274abe84826dabf20cb6cd",
       "policies": [
        {
         "policy_type": "prevention",
         "policy_id": "1d34205a4e2c4d1991431c037c8e5734",
         "applied": true,
         "settings_hash": "7cb00a74",
         "assigned_date": "2021-02-22T13:56:37.759459481Z",
         "applied_date": "2021-02-22T13:57:19.962692301Z",
         "rule_groups": []
        }
       ],
       "meta": {
        "version": "352"
       }
      }
     ],
     "errors": []
    }

我试过了：

Dim restApiResponse = JsonConvert.DeserializeObject(Of RestApiResponseRoot)(dr)
' This is your array of strings
Dim resources = restApiResponse.Resources

不幸的是我明白了 Newtonsoft.Json.JsonReaderException: '解析值时遇到意外字符：{.路径'resources'，第8行，位置3.'

Answer 1

尝试在输出的第一个和最后一个字符中使用 " 修剪资源值

Answer 2

资源属性是一个数组。像往常一样，您需要指定要考虑的数组元素。在这种情况下，第一个，即索引 0.

处的元素

Dim jsonObject = JObject.Parse(data_response_raw)
Dim firstResource = jsonObject("resources")(0).ToString()

如果您希望数组内容作为字符串数组，而不仅仅是第一个元素 - 假设 resources 可以包含多个字符串（毕竟它是一个数组） - 反序列化为 String() :

Dim jsonObject = JObject.Parse(data_response_raw)
Dim resources = JsonConvert.DeserializeObject(Of String())(jsonObject("resources").ToString())

如果您需要整个 JSON 响应，我建议反序列化为代表 JSON:

的 class 模型

Public Class RestApiResponseRoot
    Public Property Meta As Meta
    Public Property Resources As List(Of String)
    Public Property Errors As List(Of Object)
End Class
Public Class Meta
    <JsonProperty("query_time")>
    Public Property QueryTime As Double
    Public Property Pagination As Pagination
    <JsonProperty("powered_by")>
    Public Property PoweredBy As String
    <JsonProperty("trace_id")>
    Public Property TraceId As Guid
End Class
Public Class Pagination
    Public Property Offset As Long
    Public Property Limit As Long
    Public Property Total As Long
End Class

然后您可以反序列化模型的根对象 - class 在这里命名为 RestApiResponseRoot - 并像往常一样访问它的属性：

Dim restApiResponse = JsonConvert.DeserializeObject(Of RestApiResponseRoot)(
    data_response_raw
)
' This is your array of strings
Dim resources = restApiResponse.Resources

另一个 JSON 响应略有不同，响应属性包含一个对象数组而不是字符串。
添加了更多属性和嵌套对象。您只需要调整模型即可。

Public Class RestApiResponseRoot2
    Public Property Meta As RootObjectMeta
    Public Property Resources As List(Of Resource)
    Public Property Errors As List(Of Object)
End Class

Public Class RootObjectMeta
    <JsonProperty("query_time")>
    Public Property QueryTime As Double
    <JsonProperty("powered_by")>
    Public Property PoweredBy As String
    <JsonProperty("trace_id")>
    Public Property TraceId As Guid
End Class

Public Class Resource
    <JsonProperty("device_id")>
    Public Property DeviceId As String
    Public Property Policies As List(Of Policy)
    Public Property Meta As ResourceMeta
End Class

Public Class ResourceMeta
    Public Property Version As String
End Class

Public Class Policy
    <JsonProperty("policy_type")>
    Public Property PolicyType As String
    <JsonProperty("policy_id")>
    Public Property PolicyId As String
    Public Property Applied As Boolean
    <JsonProperty("settings_hash")>
    Public Property SettingsHash As String
    <JsonProperty("assigned_date")>
    Public Property AssignedDate As DateTimeOffset
    <JsonProperty("applied_date")>
    Public Property AppliedDate As DateTimeOffset
    <JsonProperty("rule_groups")>
    Public Property RuleGroups As List(Of Object)
End Class

Dim restApiResponse2 = JsonConvert.DeserializeObject(Of RestApiResponseRoot2)(dr)
Dim resources As List(Of Resource) = restApiResponse2.Resources
' DeviceId of the first Resources object
Dim deviceId = resources(0).DeviceId

您可以使用一些在线资源来处理您的 JSON 对象：

JSON Formatter & Validator

QuickType - JSON 到 .Net classes - C#，没有 VB.Net

JSON Utils - JSON 到 .Net classes - 包括 VB.Net。能力比 QuickType 稍差。

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