关闭窗体FormCloseing事件 当关闭窗体时会跳出个提示对话框,提示是否退出系统; 程序代码private void main_FormClosing(object sender, FormClosingEventArgs e) { DialogResult key = MessageBox.Show("close", "confirm", MessageBoxButtons.YesNo,MessageBoxIcon.Question); e.Cancel = (key == DialogResult.No); }