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how to serialize standard properties of vb control

Posted on 2014-12-03
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Last Modified: 2014-12-04
I made this class

<Serializable()> _
Public Class MyLabel
    Inherits Label
    Implements ISerializable

#Region "Initializers"
    Public Sub New()
    End Sub
#End Region

#Region " properties ..."
    Private e_myproperty As String = Nothing
    <Browsable(True)> _
    Public Property myproperty() As String
        Get
            Return e_myproperty
        End Get
        Set(ByVal value As String)
            e_myproperty = value
        End Set
    End Property
#End Region


#Region "Serialization"
    Public Sub New(ByVal info As SerializationInfo, ByVal context As StreamingContext)
        e_myproperty = info.GetString("myproperty")
    End Sub

    Public Sub GetObjectData(ByVal info As System.Runtime.Serialization.SerializationInfo, ByVal context As System.Runtime.Serialization.StreamingContext) Implements System.Runtime.Serialization.ISerializable.GetObjectData
        info.AddValue("myproperty", e_myproperty)
    End Sub
#End Region
End Class

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My question would be that if it is possible to serialize the standard properties of the control like "visible" or "enabled"

I dont know why no matter what I do if change the values of the standard properties before serialize this class to a file, when I deserialize from file this properties has the initial values not the values that I put before saved to a file
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Question by:altariamx2003
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4 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 40480751
Standard controls are not marked with the <Serializable> attribute, so if you want to do binary serialization of a control, then you're going to have to manually do so with the ISerializable that you are already using.
0
 

Author Comment

by:altariamx2003
ID: 40480865
thanks for answer kaufmed

Did you know how to add and serialize into my class a standard property like "visible"???
0
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 40481004
As I mentioned, use the ISerializable interface.

e.g.

<Serializable()> _
Public Class MyLabel
    Inherits Label
    Implements ISerializable

#Region "Initializers"
    Public Sub New()
    End Sub
#End Region

#Region " properties ..."
    Private e_myproperty As String = Nothing
    <Browsable(True)> _
    Public Property myproperty() As String
        Get
            Return e_myproperty
        End Get
        Set(ByVal value As String)
            e_myproperty = value
        End Set
    End Property
#End Region


#Region "Serialization"
    Public Sub New(ByVal info As SerializationInfo, ByVal context As StreamingContext)
        e_myproperty = info.GetString("myproperty")
        Me.Text = info.GetString("Text")
    End Sub

    Public Sub GetObjectData(ByVal info As System.Runtime.Serialization.SerializationInfo, ByVal context As System.Runtime.Serialization.StreamingContext) Implements System.Runtime.Serialization.ISerializable.GetObjectData
        info.AddValue("myproperty", e_myproperty)
        info.AddValue("Text", Me.Text)
    End Sub
#End Region
End Class

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In the above, you can see that I added in the Text property to be (de)serialized. I'd suggest that when you deserialize that you do a mapping of the properties from the deserialized object to the instance of the control that is on your form rather than doing a direct assignment. I think it will be easier to understand in terms of what you are doing.

e.g.

Dim s As New BinaryFormatter()

Using f As FileStream = File.Open("out.bin", FileMode.Open)
    Dim temp As MyLabel = DirectCast(s.Deserialize(f), MyLabel)

    Me.MyLabel1.Text = temp.Text    ' Map the Text property rather than assigning the control directly
End Using

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You can do a direct assignment of the deserialized control, but you'd also have to remember to add the deserialized control to the form's Controls collection as well as removing the old control.
0
 

Author Comment

by:altariamx2003
ID: 40481400
It works kaufmed!!!!

Thanks a lot!!!!
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