Question

我道歉，因为我相信这个问题非常基本。我希望在关闭时对表单进行一些清理。其他语言有OnClose()或OnDestroy()方法。 VB.net使用.NET 3.5框架的等价物是什么？

Answer 1

System.Windows.Forms.Form 实现了IDisposable接口。像任何实现IDisposable的对象一样，清理代码最好放在Dispose事件或例程中。

请参阅以下示例，其中显示了以下事件处理程序：

事件Form.Disposed
事件Form.FormClosed

事件Form.FormClosing

Public Class Form1

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load

    REM     we are loaded... probably  =)

End Sub

Private Sub Form1_Disposed(sender As Object, e As System.EventArgs) Handles Me.Disposed

    REM     Put cleanup code here...

    REM     when we are done here the form will be completly disposed of

End Sub

Private Sub Form1_FormClosed(sender As Object, e As System.Windows.Forms.FormClosedEventArgs) Handles Me.FormClosed

    REM     Here the form is CLOSED but not disposed YET!

End Sub


Private Sub Form1_FormClosing(sender As Object, e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing

    REM     Here the form is CLosing, but has not closed yet, and the closing behavior itself can actually be aborted:

    REM     To cancel the closing of a form you can:

    ' e.Cancel = True 

End Sub

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
    Me.Dispose()
End Sub

结束班

结果你也可以通过使用声明处理：使用关键字可用于实现IDisposable接口的所有对象。

 using frm as new form() ' A new form is created here
     frm.ShowDialog()  ' form is displayed as a Modal form (  dialog ) 
 end using             ' form is Disposed() of here.

VB.net Framework 3.5 OnClose（）或OnDestroy（）

1 个答案: