Winform不用系统自带的右上角关闭按钮，自定义关闭窗体按钮

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private void button1_Click(object sender, EventArgs e)
{
    DialogResult result = MessageBox.Show("是否退出应用程序", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
    if (result == DialogResult.OK)
    {
        System.Environment.Exit(0);
    }
}