确定和取消对话框

private void frmMain_FormClosing(object sender, FormClosingEventArgs e)
{
    DialogResult dr = MessageBox.Show("确定要退出系统？", "系统消息", MessageBoxButtons.OKCancel);
    if (dr == System.Windows.Forms.DialogResult.Cancel)
    {
        e.Cancel = true;
    }
    this.m_systemDoc.Save();
}

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确定和取消对话框

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