实现方法分为两大类:窗体事件和控件事件,下面就一一展示:
一、FormClosing事件(又分以下几种方法)
a.
Private Sub frmPractise_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing If MessageBox.Show("确定退出吗?", "退出确认", MessageBoxButtons.YesNo, MessageBoxIcon.Question) = Windows.Forms.DialogResult.No Then e.Cancel = True End If End Sub
b.
Private Sub Practise_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing If MsgBox("确定退出吗?", MessageBoxButtons.OKCancel, "退出确认") = Windows.Forms.DialogResult.Cancel Then e.Cancel = True End If End Sub
c.
Private Sub Practise_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing Dim p As Integer p = MsgBox("你真的要退出系统吗?", MsgBoxStyle.OkCancel, "提示") If p = 2 Then e.Cancel = True End If End Sub
d.(最为简单)
Private Sub Practise_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing If MsgBox("你确认要退出程序吗?", MsgBoxStyle.OkCancel, "退出提示") = MsgBoxResult.Cancel Then e.Cancel = True End Sub
以上只是点击窗口关闭按钮时的用法,若直接在窗体控件上点击退出时,可以用以下方式实现:
二、Button_Click事件
Private Sub btnQuit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnQuit.Click If MsgBox("是否要退出系统?", MsgBoxStyle.YesNo + MsgBoxStyle.Question, "提示") = MsgBoxResult.Yes Then Application.Exit() End If End Sub
时间: 2024-10-24 22:24:12