Control Created event

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Hi,
I've created a class in VB.Net, it inherits panel class, so I'll use it as a control in my application. How can I catch "when this control is created" as event?
I tried resized event defining a boolean that is false at the first time, and becomes true at first resize event, so will occur once, so I tought it would call resize event when it is created by designer, but it didn't. Here is my code:

VB

Public Class ScrollPanel
    Inherits Panel
    Dim pnl As New Panel With {.Location = New Point(0, 0), .Size = New Size(Me.Width - 10, Me.Height), .BackColor = Color.White}
    Dim kgOk As Boolean = False

    Private Sub SC() Handles MyBase.SizeChanged
        If Not kgOk Then
            Controls.Add(pnl)
            kgOk = True
        End If
    End Sub
End Class

Posted 10-Jul-14 6:11am

MuhsinFatih

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Sergey Alexandrovich Kryukov 10-Jul-14 12:19pm

To start with, tag your UI library and/or application type. For example, what is "Panel"? There are different unrelated classes under this name. Full type name, please.
—SA

MuhsinFatih 10-Jul-14 14:19pm

I mean the panel in the toolbox of VB.Net (Windows desktop application). Maciej Los' solution is exactly what I wanted. Thanks

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Maciej Los · Accepted Answer · 2014-07-10T06:33:00

Solution 1

Not sure what you want, but it seems like you want to use constructor.

Class definition:

VB

Public Class ScrollPanel
    Inherits Panel

    Private sText As String = "New Panel"

    Public Sub New()
        MsgBox(String.Concat(sText, " has been created!"), MsgBoxStyle.Information, "Message")
    End Sub



    Protected Overrides Sub Finalize()
        MyBase.Finalize()
    End Sub
End Class

Usage:

VB

Dim sp As ScrollPanel = New ScrollPanel With {.Parent = Me, .Size = New Size(100, 100), .Location = New Point(80, 80), .Visible = True}

More:
Using Constructors and Destructors[^]

Posted 10-Jul-14 6:33am

Maciej Los

Comments

MuhsinFatih 10-Jul-14 14:20pm

This is exactly what I wanted. Thanks!

Maciej Los 10-Jul-14 14:54pm

You're very welcome ;)

Maciej Los 10-Jul-14 15:00pm

BTW: To add new control to your ScrollPanel, use: MyBase.Controls.Add(control). You don't need to create private object pnl inside your class.

MuhsinFatih 10-Jul-14 15:18pm

The pnl panel is a part of my control, so I use it in main events of scrollpanel. So I think it would be easier to define it in class. But I add the other controls which can change in time like you've showed to me. Thank you

Maciej Los 10-Jul-14 15:27pm

Whenever you want to manage ScollPanel's properties, events and methods, inherited from base class, use MyBase. If you define custom property, use its name.
It might be interesting too: Add Custom Event to a Class in VB.NET [^]
Happy codng!
You're welcome ;)

MuhsinFatih 10-Jul-14 17:14pm

Thank you very much. I have another problem about this panel, could you help with it too please?
To help people who has the same problem, I've created another question:
http://www.codeproject.com/Questions/795485/Panel-in-custom-control-not-holding-controls