Question

如何将表示类的XML元素减少为单个字符串？我的XML序列化器输出：

<ArrayOfCity>
  <City>
    <Name>Los Angeles</Name>
    <Location>
      <Value>034.050N -118.250E</Value>
    </Location>
    <Elevation>305</Elevation>
    <Population>3884000</Population>
  </City>
  <City>
    <Name>New York</Name>
    <Location>
      <Value>040.713N -074.006E</Value>
    </Location>
    <Elevation>33</Elevation>
    <Population>8550405</Population>
  </City>
</ArrayOfCity>

但我希望它看起来像这样（简化<Location>元素）：

<ArrayOfCity>
  <City>
    <Name>Los Angeles</Name>
    <Location>034.050N -118.250E</Location>
    <Elevation>305</Elevation>
    <Population>3884000</Population>
  </City>
  <City>
    <Name>New York</Name>
    <Location>040.713N -074.006E</Location>
    <Elevation>33</Elevation>
    <Population>8550405</Population>
  </City>
</ArrayOfCity>

我的班级实施是：

Public Class City
    Public Property Name As String
    Public Property Location As LatLong
    Public Property Elevation As Integer
    Public Property Population As Integer

    Public Overrides Function ToString() As String
        Return Name
    End Function
End Class

Public Class LatLong
    Implements ISerializable

    <XmlIgnore()>
    Private _Lat As Single
    <XmlIgnore()> 
    Private _Long As Single

    <XmlIgnore()> 
    Public Property Latitude As Single
        Get
            Return _Lat
        End Get
        Set(value As Single)
            _Lat = value
        End Set
    End Property

    <XmlIgnore()> 
    Public Property Longitude As Single
        Get
            Return _Long
        End Get
        Set(value As Single)
            _Long = value
        End Set
    End Property

    Public Property Value As String
        Get
            Return String.Format("{0:000.000}N {1:000.000}E", Latitude, Longitude)
        End Get
        Set(value As String)
            'Pos Value: N & E, Neg Value: S & W
            'Format must be [###.###N ###.###E] (spacing and digits can be variable, but cannot use S or W)
            _Lat = CSng(Split(value, "N")(0))
            _Long = CSng(Split(value.Replace("E", ""), "N")(1))
        End Set
    End Property

    Public Sub New()
        _Lat = 0
        _Long = 0
    End Sub

    Public Sub New(InitialString As String)
        Value = InitialString
    End Sub

    Public Overrides Function ToString() As String
        Return Value
    End Function

    Public Shared Widening Operator CType(ByVal O As String) As LatLong
        Return New LatLong(O)
    End Operator

    Public Shared Narrowing Operator CType(O As LatLong) As String
        Return O.ToString
    End Operator

    Public Overrides Function Equals(obj As Object) As Boolean
        With DirectCast(obj, LatLong)
            Return Latitude = .Latitude AndAlso Longitude = .Longitude
        End With
    End Function

    Public Shared Operator =(Left As LatLong, Right As LatLong) As Boolean
        Return Left.Equals(Right)
    End Operator

    Public Shared Operator <>(Left As LatLong, Right As LatLong) As Boolean
        Return Not Left.Equals(Right)
    End Operator

    Protected Sub New(info As SerializationInfo, context As StreamingContext)
        'Value = DirectCast(info.GetValue("props", GetType(String)), String)
    End Sub

    Public Sub GetObjectData(info As SerializationInfo, context As StreamingContext) Implements ISerializable.GetObjectData
        Throw New NotImplementedException()
    End Sub
End Class

我很确定密钥会出现在Protected Sub New(...)和Public Sub GetObjectData(...)中，但我无法弄明白。如果可以确定的话，最好将它们用于XML元素属性。

感谢您的帮助！

更新：我想到了。 LatLong类需要实现IXmlSerializable，WriteXML（...）和ReadXML（...）subs需要像这样实现：

Public Sub ReadXml(reader As XmlReader) Implements IXmlSerializable.ReadXml
    Value = reader.ReadElementContentAsString
End Sub

Public Sub WriteXml(writer As XmlWriter) Implements IXmlSerializable.WriteXml
    writer.WriteString(Value)
End Sub

Answer 1

LatLong类需要实现IXmlSerializable，而WriteXML（...）和ReadXML（...）subs需要像这样实现：

Public Sub ReadXml(reader As XmlReader) Implements IXmlSerializable.ReadXml
    Value = reader.ReadElementContentAsString
End Sub

Public Sub WriteXml(writer As XmlWriter) Implements IXmlSerializable.WriteXml
    writer.WriteString(Value)
End Sub

XML将整个类序列化为字符串

1 个答案: