我正试图通过此端点从欧洲中央银行（ECB）获取数据：https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml
我制作了一个适合XML元素的结构。但是，子节点没有出现。我使用了错误的元素吗？这是结构。
XML：
<?xml version="1.0" encoding="UTF-8"?>
<gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref">
<gesmes:subject>Reference rates</gesmes:subject>
<gesmes:Sender>
<gesmes:name>European Central Bank</gesmes:name>
</gesmes:Sender>
<Cube>
<Cube time="2018-04-30">
<Cube currency="USD" rate="1.2079"/>
<Cube currency="JPY" rate="132.12"/>
<Cube currency="BGN" rate="1.9558"/>
<Cube currency="CZK" rate="25.542"/>
<Cube currency="DKK" rate="7.4501"/>
<Cube currency="GBP" rate="0.87960"/>
<Cube currency="HUF" rate="313.55"/>
<Cube currency="PLN" rate="4.2264"/>
<Cube currency="RON" rate="4.6614"/>
<Cube currency="SEK" rate="10.4993"/>
<Cube currency="CHF" rate="1.1968"/>
<Cube currency="ISK" rate="122.20"/>
<Cube currency="NOK" rate="9.6620"/>
<Cube currency="HRK" rate="7.4100"/>
<Cube currency="RUB" rate="75.9587"/>
<Cube currency="TRY" rate="4.8896"/>
<Cube currency="AUD" rate="1.6013"/>
<Cube currency="BRL" rate="4.1932"/>
<Cube currency="CAD" rate="1.5542"/>
<Cube currency="CNY" rate="7.6574"/>
<Cube currency="HKD" rate="9.4801"/>
<Cube currency="IDR" rate="16796.15"/>
<Cube currency="ILS" rate="4.3378"/>
<Cube currency="INR" rate="80.1685"/>
<Cube currency="KRW" rate="1292.04"/>
<Cube currency="MXN" rate="22.5977"/>
<Cube currency="MYR" rate="4.7409"/>
<Cube currency="NZD" rate="1.7145"/>
<Cube currency="PHP" rate="62.452"/>
<Cube currency="SGD" rate="1.6016"/>
<Cube currency="THB" rate="38.145"/>
<Cube currency="ZAR" rate="15.0121"/>
</Cube>
</Cube>
</gesmes:Envelope>
类：
<XmlRootAttribute([ElementName]:="Sender", [Namespace]:="http://www.gesmes.org/xml/2002-08-01")>
Public Class Sender
<XmlElement([ElementName]:="name", [Namespace]:="http://www.gesmes.org/xml/2002-08-01")>
Public Property Name As String
End Class
<XmlRootAttribute([ElementName]:="Cube", [Namespace]:="http://www.ecb.int/vocabulary/2002-08-01/eurofxref")>
Public Class Cube
<XmlAttribute([AttributeName]:="name")>
Public Property Currency As String
<XmlAttribute([AttributeName]:="rate")>
Public Property Rate As String
End Class
<XmlRootAttribute([ElementName]:="Envelope", [Namespace]:="http://www.gesmes.org/xml/2002-08-01")>
Public Class Envelope
<XmlElement([ElementName]:="subject", [Namespace]:="http://www.gesmes.org/xml/2002-08-01")>
Public Property subject As String
<XmlElement([ElementName]:="Sender", [Namespace]:="http://www.gesmes.org/xml/2002-08-01")>
Public Property Sender As Sender
<XmlElement([ElementName]:="Cube", [Namespace]:="http://www.ecb.int/vocabulary/2002-08-01/eurofxref")>
Public Property Cube As Cube
<XmlAttribute([AttributeName]:="gesmes", [Namespace]:="http://www.w3.org/2000/xmlns/")>
Public Property Gesmes As String
<XmlAttribute([AttributeName]:="xmlns")>
Public Property Xmlns As String
End Class
当我采用这种结构并使用以下函数将其序列化时
Public Function ToXML(ByVal struct As Envelope, ByVal t As Type) As String
Dim stringwriter = New System.IO.StringWriter()
Dim serializer = New XmlSerializer(t)
serializer.Serialize(stringwriter, struct)
Return stringwriter.ToString()
End Function
删除所有子节点。
答案 0 :(得分：0)
使用这些类
<System.Xml.Serialization.XmlTypeAttribute(AnonymousType:=True, [Namespace]:="http://www.gesmes.org/xml/2002-08-01"),
System.Xml.Serialization.XmlRootAttribute([Namespace]:="http://www.gesmes.org/xml/2002-08-01", IsNullable:=False)>
Partial Public Class Envelope
Public Property subject() As String
Public Property Sender() As EnvelopeSender
<System.Xml.Serialization.XmlElementAttribute([Namespace]:="http://www.ecb.int/vocabulary/2002-08-01/eurofxref")>
Public Property Cube() As Cube
End Class
<System.Xml.Serialization.XmlTypeAttribute(AnonymousType:=True, [Namespace]:="http://www.gesmes.org/xml/2002-08-01")>
Partial Public Class EnvelopeSender
Public Property name() As String
End Class
<System.Xml.Serialization.XmlTypeAttribute(AnonymousType:=True, [Namespace]:="http://www.ecb.int/vocabulary/2002-08-01/eurofxref"),
System.Xml.Serialization.XmlRootAttribute([Namespace]:="http://www.ecb.int/vocabulary/2002-08-01/eurofxref", IsNullable:=False)>
Partial Public Class Cube
<System.Xml.Serialization.XmlElementAttribute("Cube")>
Public Property Cube1() As CubeCube
End Class
<System.Xml.Serialization.XmlTypeAttribute(AnonymousType:=True, [Namespace]:="http://www.ecb.int/vocabulary/2002-08-01/eurofxref")>
Partial Public Class CubeCube
<System.Xml.Serialization.XmlElementAttribute("Cube")>
Public Property Cube() As CubeCubeCube()
<System.Xml.Serialization.XmlAttributeAttribute(DataType:="date")>
Public Property time() As Date
End Class
<System.Xml.Serialization.XmlTypeAttribute(AnonymousType:=True, [Namespace]:="http://www.ecb.int/vocabulary/2002-08-01/eurofxref")>
Partial Public Class CubeCubeCube
<System.Xml.Serialization.XmlAttributeAttribute()>
Public Property currency() As String
<System.Xml.Serialization.XmlAttributeAttribute()>
Public Property rate() As Decimal
End Class
用法：
Dim xml = <gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref">
<gesmes:subject>Reference rates</gesmes:subject>
<gesmes:Sender>
<gesmes:name>European Central Bank</gesmes:name>
</gesmes:Sender>
<Cube>
<Cube time="2018-04-30">
<Cube currency="USD" rate="1.2079"/>
<Cube currency="JPY" rate="132.12"/>
<Cube currency="BGN" rate="1.9558"/>
</Cube>
</Cube>
</gesmes:Envelope>
Dim s As New Xml.Serialization.XmlSerializer(GetType(Envelope))
Dim env As Envelope
' instead of xml.ToString here, you could use a streamreader for example
Using sr As New System.IO.StringReader(xml.ToString)
env = CType(s.Deserialize(sr), Envelope)
End Using