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我有一个JSON字符串，我试图将其反序列化为 .Net 对象。

该代码有效，直到它遇到一个嵌套数组。然后它只返回空值。
在下面的示例中，当我调试和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/)，所以我很犹豫要弄清楚字符串是如何创建的。

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
}]"
4

1 回答 1

2

如前所述，您需要添加一个处理嵌套Rules对象的类。
在您的原始类结构中，Rules该类没有rules可以容纳第二级嵌套的属性。
但是您还需要处理未确定的嵌套级别，因为其他嵌套类可以具有进一步的嵌套Rules对象。

您可以通过引用自身来添加一个处理这种嵌套的新类： 

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

另外，它必须包含一个对象数组/列表Value。

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

这个示例类（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)

序列化List(Of QueryBuilder)回原始 JSON 对象。
请注意，使用 Visual Studio 中的 JSON 可视化工具，该结构与原始结构完全相同： 

Dim jsonOutput = Queries.Serialize(myQueries)

Queries班级 ：

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
于 2019-05-03T22:17:22.063 回答