Question

c#中为什么关闭窗口时不弹出退出提示：代码如下

private void form1_Closed(object sender, EventArgs e)

{
MessageBox.Show("欢迎您下次再来！", "再见对话框");
}
private void button3_Click(object sender, EventArgs e)
{
this.Close();
}

Answer 1

把事件写在Form_Closing而不是Form_Closed中。因为如果是Closed，主窗口已经关闭了，对话框就出不来了。

Answer 2

应该是像这样的
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (MessageBox.Show("将要要关闭窗体，是否继续？", "询问", MessageBoxButtons.YesNo) == DialogResult.Yes)
{
e.Cancel = false;
}
else
{
e.Cancel = true;
}

}

Answer 3

private void form1（object sender, EventArgs e)
｛
MessageBox.Show("欢迎您下次再来！", "再见对话框");
this.Close();
｝

这样就可以了，不用那么麻烦

Answer 4

private void button3_Click(object sender, EventArgs e)
{
if (MessageBox.Show("是否关闭程序！", "安全", MessageBoxButtons.OKCancel, MessageBoxIcon.Information) == DialogResult.OK)
{
Application.Exit();
}
}