Why i get the this data after serialize an object

Question

1.00/5 (1 vote)

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Hi everybody,
I want to know why i get de last value in a collection of data. I made the serialization in an object which is composed by two members. Here is the code

VB

Imports System.Xml.Serialization
'<XmlRoot("AuditLogiciel")> 
<serializable()>
Public Class DataAcquisition
    Public Sub New()
        ' Rien à faire.
    End Sub
#Region "Déclaration"
    Public DateData As Date
    Public MesureCapteur As String
 
#End Region
 
#Region "Propiétés"
 
    '<XmlAttribute("Dates")>
    Public Property Dates() As Date
        Get
            Return DateData
        End Get
        Set(ByVal value As Date)
            DateData = value
 
        End Set
    End Property
    ' <XmlAttribute("CapteurMesure")>
    Public Property CapteurMesure() As String
        Get
            Return MesureCapteur
        End Get
        Set(ByVal value As String)
            MesureCapteur = value
 
        End Set
    End Property
 
#End Region
 
#Region "Métodes"
 
  
#End Region
 

End Class

In another class:

VB

Private Sub MainWindow_Closing(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing


        Dim xSerializer As XmlSerializer = New XmlSerializer(GetType(DataAcquisition))
        Dim writer As TextWriter = New StreamWriter("nomFichierConfigXml.XML")
        xSerializer.Serialize(writer, Config)
        writer.Close()

    End Sub

The property Dates is fill with many information. Son when i made the serialisation, i get just de last value of that information within Dates.

Here is the result:

XML

<?xml version="1.0" encoding="UTF-8"?>
-<DataMesuresCapteur xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">-<AcquisiMesur>-<DataAcquisition><Dates>2013-09-23T17:25:35</Dates><CapteurMesure>0,4</CapteurMesure></DataAcquisition>-<DataAcquisition><Dates>2013-09-23T17:25:35</Dates><CapteurMesure>0,4</CapteurMesure></DataAcquisition>-<DataAcquisition><Dates>2013-09-23T17:25:35</Dates><CapteurMesure>0,4</CapteurMesure></DataAcquisition>-<DataAcquisition><Dates>2013-09-23T17:25:35</Dates><CapteurMesure>0,4</CapteurMesure></DataAcquisition>-<DataAcquisition><Dates>2013-09-23T17:25:35</Dates><CapteurMesure>0,4</CapteurMesure></DataAcquisition>-<DataAcquisition><Dates>2013-09-23T17:25:35</Dates><CapteurMesure>0,4</CapteurMesure></DataAcquisition>

As you can see is always the same value (the last value of my dates).
Note: Dates is fill with many values.

Why i get just one value and not ALL VALUES.

Thanks

Posted 23-Sep-13 5:24am

alonetmr

Updated 23-Sep-13 5:29am

v2

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Comments

Sergey Alexandrovich Kryukov 23-Sep-13 12:34pm

You did not show how Config is obtained, but you just have the data your created.
—SA

[no name] 23-Sep-13 13:57pm

You are getting that one single value because that is all that your class contains. Your class defines Dates as a single DateTime not as an array or collection of dates.

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Thomas Barbare · Answer 1 · 2013-09-23T08:02:00

You have to serialize a collection of object not only one instance (Config in your case)

Try this :

VB

'<XmlRoot("AuditLogiciel")>
<Serializable()>
Public Class DataAcquisition
    <NonSerialized()>
    Public Shared List As List(Of DataAcquisition) = New List(Of DataAcquisition)
    Public Sub New()
        ' Rien à faire.
        List.Add(Me)
    End Sub
#Region "Déclaration"
    Public DateData As Date
    Public MesureCapteur As String

#End Region

#Region "Propiétés"
     '<XmlAttribute("Dates")>
    Public Property Dates() As Date
        Get
            Return DateData
        End Get
        Set(ByVal value As Date)
            DateData = value

        End Set
    End Property
    ' <XmlAttribute("CapteurMesure")>
    Public Property CapteurMesure() As String
        Get
            Return MesureCapteur
        End Get
        Set(ByVal value As String)
            MesureCapteur = value

        End Set
    End Property

#End Region

#Region "Métodes"
 
#End Region


End Class

VB

Dim test As DataAcquisition = New DataAcquisition() With {.CapteurMesure = "5", .Dates = Date.Now}
   Dim test2 As DataAcquisition = New DataAcquisition() With {.CapteurMesure = "7", .Dates = Date.Today}
   Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
       Dim xSerializer As XmlSerializer = New XmlSerializer(GetType(List(Of DataAcquisition)))
       Dim writer As TextWriter = New StreamWriter("nomFichierConfigXml.XML")
       xSerializer.Serialize(writer, DataAcquisition.List)
       writer.Close()
   End Sub