XMLSerializer为什么不序列化此类，即使我为派生类添加了XMLinclude属性？

Question

问题

我正在尝试XML序列化“ profileserialize”类，但是在调用xssubmit.serialize（writer，obj） serialize in serialize 函数如下所示。

异常

message =“预期的类型profileformatnumber。请使用Xmlinclude或soapinclude属性来指定静态不知道的类型。”

我已经尝试过的

我尝试实现这些线程中提到的解决方案：

1. 如何在xml中序列化派生类？
2. 使用xmlSerializer序列化

类

Imports System
Imports System.Collections.Generic
Imports System.Collections
Imports System.IO
Imports System.Text
Imports System.Linq
Imports System.Reflection
Imports System.Xml.Serialization
Imports System.XML

' https://stackoverflow.com/questions/72856211/why-does-xmlserializer-fail-to-serialize-this-class-even-though-i-added-the-xmli

<XmlInclude(GetType(ProfileFormatNumber))>
Public Class ProfileFormat
    <XmlElement(ElementName:="e1")>
    Public Property Name As String = String.Empty      
End Class

Public Class ProfileFormatNumber
    Inherits ProfileFormat

    <XmlElement(ElementName:="e1")>
    Public Property Divider As Integer = 1
End Class

Public Class Serializer(Of T)
    Public Shared Function Serialize(ByVal obj As T) As String

            Dim xsSubmit As XmlSerializer = New XmlSerializer(GetType(T))

            Using sww = New StringWriter()

                Using writer As XmlTextWriter = New XmlTextWriter(sww) With {.Formatting = Formatting.Indented}
                    xsSubmit.Serialize(writer, obj)
                    Return sww.ToString() ' I would recommend moving this out of the inner Using statement to guarantee the XmlWriter is flushed and closed
                End Using

            End Using

    End Function
End Class
                
Public Module Module1
    Public Sub Main()
        Dim profileFormat = New ProfileFormatNumber With { .Name = "my name", .Divider = 111 }

        Dim xml2 = Serializer(Of ProfileFormat).Serialize(profileFormat)
        Console.WriteLine(xml2)

    End Sub
End Module

我的问题

我如何修改代码以正确使用＆lt; xmlinclude（getType（））＆gt;属性？我尝试在多个位置添加它，但总是会收到相同的例外。

Answer 1

您的问题不是 > 。您的问题是，您正在尝试将profileformatnumber，divider and（从base类）name的两个属性分配给同一元素名称＆lt; e1＆gt;通过设置 noroflow noreferrer“> ”）＆gt; 两者都在。即，如果能够序列化您的profile formatnumber as-is，则XML看起来像：

<ProfileFormat xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:type="ProfileFormatNumber">
  <e1>my name</e1>
  <e1>111</e1>
</ProfileFormat>

但是xmlSerialializer不支持这一点（也许是因为在挑战中会有歧义），因此（略微难以理解的）错误抱怨元素名称e1已经存在：

The XML element 'e1' from namespace '' is already present in the current scope. Use XML attributes to specify another XML name or namespace for the element.]

相反，请使用其他混淆的元素名称profileformatnumber.divider例如＆lt; f1＆gt;：

<XmlInclude(GetType(ProfileFormatNumber))>
Public Class ProfileFormat
    <XmlElement(ElementName:="e1")>
    Public Property Name As String = String.Empty      
End Class

Public Class ProfileFormatNumber
    Inherits ProfileFormat

    <XmlElement(ElementName:="f1")>
    Public Property Divider As Integer = 1
End Class

demo fiddle 。