[英]Converting JSON Data in VB.NET
我正在尝试将此数据转换为结构。
我有这样的结构:
Public Structure cChartData
Public cUDate As String
Public cOpen As Double
Public cClose As Double
Public cHigh As Double
Public cLow As Double
End Structure
和这样的类:
Friend Class ChartData
Public Property uDate() As String
Get
Return m_date
End Get
Set
m_date = Value
End Set
End Property
Private m_date As String
Public Property high() As String
Get
Return m_high
End Get
Set
m_high = Value
End Set
End Property
Private m_high As String
Public Property low() As String
Get
Return m_low
End Get
Set
m_low = Value
End Set
End Property
Private m_low As String
Public Property open() As String
Get
Return m_open
End Get
Set
m_open = Value
End Set
End Property
Private m_open As String
Public Property close() As String
Get
Return m_close
End Get
Set
m_close = Value
End Set
End Property
Private m_close As String
Public Property volume() As String
Get
Return m_volume
End Get
Set
m_volume = Value
End Set
End Property
Private m_volume As String
Public Property quoteVolume() As String
Get
Return m_quoteVolume
End Get
Set
m_quoteVolume = Value
End Set
End Property
Private m_quoteVolume As String
Public Property weightedAverage() As String
Get
Return m_weightedAverage
End Get
Set
m_weightedAverage = Value
End Set
End Property
Private m_weightedAverage As String
End Class
我试图从每一行中检索所有变量。 除了日期我都知道了。 我正在使用以下代码(其中chartInfo = JSON数据):
Dim cdata = JsonConvert.DeserializeObject(Of List(Of ChartData))(chartInfo)
Dim cResData(cdata.Count - 1) As cChartData
For i = 0 To cdata.Count - 1
cResData(i).cUDate = cdata(i).uDate
cResData(i).cOpen = Convert.ToDouble(cdata(i).open)
cResData(i).cClose = Convert.ToDouble(cdata(i).close)
cResData(i).cHigh = Convert.ToDouble(cdata(i).high)
cResData(i).cLow = Convert.ToDouble(cdata(i).low)
Next
Return cResData
显示时,日期返回“空白”值,或不返回任何值,但所有其他值均正确返回。 它是第一个值,所以我想知道它是否与它有关。
任何帮助是极大的赞赏。
当可以序列化属性时,JSON序列化器将其保留为空。
因此,您的JSON中的日期为空或为null,或者它们是.NET默认无法序列化的DateFormat。
在您发布的JSON中,日期字段是数字格式,例如“ 1438992000”,表示它是时间戳。
此外,字段名称为'date',但您已将属性定义为uDate
。 为了使序列化起作用,除非覆盖默认的序列化,否则属性名称必须与JSON密钥匹配。 更改定义,如下所示,它将序列化:
Public Property [date] As String
Get
Return m_date
End Get
Set
m_date = Value
End Set
End Property
您为uDate
属性获得“空”值的uDate
是,porperty名称应匹配才能成功进行反序列化。
您可以更改属性名称来满足此规则。 但是,如果您希望按原样将属性名称保留在类中,则可以将JsonPropertyAttribute
用于json名称。
Public Class ChartData
<JsonProperty("date")>
Public Property uDate As String
<JsonProperty("high")>
Public Property high As String
End Class
使用属性,可以为不同的代码环境使用不同的命名约定。 例如,.NET中的“ PascalCase”和JSON中的“ camelCase”
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