控制创建事件

问题描述

我在VB.Net中创建了一个类，它继承了面板类，所以我将它用作我的应用程序中的控件。我如何捕获何时创建此控件作为事件？

我尝试调整大小的事件，定义一个第一次为false的布尔值，并在第一次调整大小事件时变为true，因此将发生一次，所以我认为它会在设计师创建时调用resize事件，但事实并非如此。这是我的代码：

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:

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

推荐答案

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

用法：

Usage:

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

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