Question

我有一个JSON字符串，我试图将其反序列化为.Net对象。

代码有效，直到遇到嵌套数组为止。然后它只返回空值。
在下面的示例中，当我调试并查看处理后的对象时，它将只有：

规则：

0:  Will contain all data for the first node (project_number)  
1:  Will contain all data for the second node (agreement_number)  
2:  All fields will be Nothing  

Condition: AND  
Valid: true

如何反序列化整个对象？请注意，JSON字符串来自库（https://querybuilder.js.org/），因此我很想弄清楚字符串的创建方式。

这是我的代码：

 Dim TestObj = JsonConvert.DeserializeObject(Of List(Of JsonObject))(TestString)

<Serializable()>
Public Class JsonObject
    Public Property condition As String
    Public Property Rules As List(Of Rules)
    Public Property valid As Boolean
End Class

<Serializable()>
Public Class Rules
    Public Property id As String
    Public Property field As String
    Public Property type As String
    Public Property input As String
    Public Property [operator] As String
    Public Property value As String
End Class

Public Property TestString As String = "[
{
   'condition':'AND',
   'rules':[
      {
         'id':'project_number',
         'field':'project_number',
         'type':'string',
         'input':'text',
         'operator':'equal',
         'value':'dfgdfs'
      },
      {
         'id':'agreement_number',
         'field':'agreement_number',
         'type':'string',
         'input':'text',
         'operator':'contains',
         'value':'asdfas'
      },
      {
         'condition':'AND',
         'rules':[
            {
               'id':'division',
               'field':'division',
               'type':'string',
               'input':'select',
               'operator':'in',
               'value':[
                  '0',
                  '11719'
               ]
            },
            {
               'condition':'AND',
               'rules':[
                  {
                     'id':'ta',
                     'field':'ta',
                     'type':'string',
                     'input':'select',
                     'operator':'in',
                     'value':[
                        '24740',
                        '24744'
                     ]
                  }
               ]
            }
         ]
      }
   ],
   'valid':true
}]"

Answer 1

如上所述，您需要添加一个用于处理嵌套的 Rules 对象的类。
在您原始的类结构中，Rules类没有可容纳第二层嵌套的 rules 属性。
但是，您还需要处理不确定的嵌套级别，因为其他嵌套类可以进一步嵌套 Rules 对象。

您可以通过引用自身来添加一个处理此类嵌套的新类：

Partial Public Class RulesList
    Public Id As String
    Public Value As Long()
    '(...)
    Public Rules As RulesList()
End Class

此外，它必须包含 Value 对象的数组/列表。

请注意，我使用的是 Arrays 而不是 Lists ：检查结果更容易，您可以使用 List(Of [Type]) 如果您愿意，最终输出不会改变。

该示例类（名为 Queries ）实现了这种结构。
它还包括作为static（shared）方法的序列化和反序列化（简化，无错误检查/处理）。

假设 jsonInput 是您的JSON对象：

反序列化为 List(Of QueryBuilder) ：

Dim myQueries = Queries.Deserialize(jsonInput)

将 List(Of QueryBuilder) 序列化回原始JSON对象。
请注意，使用Visual Studio中的JSON可视化工具，该结构将完全按照原始结构进行再现：

Dim jsonOutput = Queries.Serialize(myQueries)

Queries 类：

Imports Newtonsoft.Json

Public Class Queries
    Public Class QueryBuilder
        Public Condition As String
        Public Rules As Rules()
        Public Valid As Boolean
    End Class

    Public Class Rules
        Public Id As String
        Public Field As String
        <JsonProperty("type")>
        Public QueryType As String
        Public Input As String
        <JsonProperty("operator")>
        Public QueryOperator As String
        Public Value As String
        Public Condition As String
        Public Rules As RulesList()
    End Class
    Partial Public Class RulesList
        Public Id As String
        Public Field As String
        <JsonProperty("type")>
        Public QueryType As String
        Public Input As String
        <JsonProperty("operator")>
        Public QueryOperator As String
        Public Value As Long()
        Public Condition As String
        Public Rules As RulesList()
    End Class

    Public Shared Function Deserialize(jsonSource As String) As List(Of QueryBuilder)
        Return JsonConvert.DeserializeObject(Of List(Of QueryBuilder))(jsonSource)
    End Function

    Public Shared Function Serialize(classObject As List(Of QueryBuilder)) As String
        Return JsonConvert.SerializeObject(classObject)
    End Function

End Class

反序列化JSON嵌套数组

1 个答案: