Deserialize XML array in vb.net

Question

I need to deserialize a XML file in VB.NET.

I'm using the standard XML library. I'm not able to write down the vb code to define the following structure:

<myvar>
    <var>...</var>
    <troublecodes>
        <troublecode>
        ...
        </troublecode>
        <troublecode>
        ....
        </troublecode>
        <statusbyte>
        ....
        </statusbyte>
        <statusbyte>
        ....
        </statusbyte>
        <statusbyte>
        ....
        </statusbyte>
    </troublecodes>
</myvar>

My definitions are:

Public Class MyVar
  <XmlElement("var")> Public name As String
  <XmlElement("troublecodes")> Public troubleCodes As TroubleCodes
End Class

Public Class TroubleCodes
<XmlArrayItem("troublecode")> Public troubleCode() As TroubleCode
<XmlArrayItem("statusbyte")> Public statusByte() As StatusByte
End Class

Public Class TroubleCode
  <XmlElement("one")> Public one As String
  <XmlElement("two")> Public two As String
End Class

Public Class StatusByte
  <XmlElement("three")> Public threeAs String
  <XmlElement("four")> Public four As String
End Class

but the objects are not populated by the deserialization.
How can i define them?

I changed XmlArrayItem to XmlArray but again no data.

SteMMo
– SteMMo

2016-10-19 14:37:38 +00:00
Commented Oct 19, 2016 at 14:37 — SteMMo
– SteMMo, Commented Oct 19, 2016 at 14:37
Perhaps this'll help: stackoverflow.com/a/20133287/3740093

Visual Vincent
– Visual Vincent

2016-10-19 20:04:16 +00:00
Commented Oct 19, 2016 at 20:04 — Visual Vincent
– Visual Vincent, Commented Oct 19, 2016 at 20:04

dbc · Accepted Answer · 2016-10-19 23:08:22Z

Problems in deserialization can typically be diagnosed by serializing an example of your root type and comparing the generated XML with the desired XML. If I do so with your MyVar type (demo fiddle) I get the following result:

<MyVar>
  <var>my name</var>
  <troublecodes>
    <troubleCode>
      <troublecode>
        <one>one</one>
        <two>two</two>
      </troublecode>
    </troubleCode>
    <statusByte>
      <statusbyte>
        <three>three</three>
        <four>four</four>
      </statusbyte>
    </statusByte>
  </troublecodes>
</MyVar>

This has the following problems:

The root node is incorrectly capitalized.

This can be fixed by adding <XmlRoot("myvar")> to your root type.
There is an extra level of nesting of <troubleCode>.

By default, XmlSerializer serializes all collections including arrays with an outer container element. To suppress the outer container element and serialize the collection as a flat sequence of elements, replace the XmlArrayItem attribute with <XmlElement("troublecode")>.
There is also an extra level of nesting of <statusByte>.

Thus your types should be as follows:

<XmlRoot("myvar")> _
Public Class MyVar
    <XmlElement("var")> Public name As String
    <XmlElement("troublecodes")> Public troubleCodes As TroubleCodes
End Class

Public Class TroubleCodes
    <XmlElement("troublecode")> Public troubleCode() As TroubleCode
    <XmlElement("statusbyte")> Public statusByte() As StatusByte
End Class

Public Class TroubleCode
    <XmlElement("one")> Public one As String
    <XmlElement("two")> Public two As String
End Class

Public Class StatusByte
    <XmlElement("three")> Public three As String
    <XmlElement("four")> Public four As String
End Class

Fixed fiddle.

@SteMMo - I copied your classes verbatim into the fiddle dotnetfiddle.net/qZaw2t, and saw the extra levels. Have you changed the classes after asking the question? And do the classes in the answer generate the XML you require?

SteMMo · Accepted Answer · 2016-10-24 16:24:05Z

1

My solution is:

Public Class TroubleCodes  
    <XmlElement("troublecode")> Public troubleCode() As TroubleCode
    <XmlElement("statusbyte")> Public statusByte() As StatusByte
End Class

Serializing the variable I obtain the same XML code.

answered Oct 24, 2016 at 16:24

SteMMo

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