单击菜单只运行一个子窗体实例的简单方法

Private m_Form2 As Form2

Private Sub Form2MenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Form2MenuItem.Click

If m_Form2 Is Nothing OrElse m_Form2.IsDisposed Then

m_Form2 = New Form2

m_Form2.MdiParent = Me

m_Form2.Show()

Else

m_Form2.Activate()

End If

End Sub

注：以前我是运用通过记录Handle来遍历子窗体的办法.今天看着Dispose,试试能不能利用,果是行的.

不知这样做法有什么弊处.