//创建跑偏检测界面
private void btn_Deviation_Click(object sender, EventArgs e)
{
//判断子窗口是否有实例
if (deviationFrm == null)
{
deviationFrm = new DeviationFrm();
deviationFrm.Show();
//子窗口关闭后增加释放实例的功能
deviationFrm.FormClosing += ReleaseObjct_Deviation;
}
else
{
//存在子窗口打开的时候，重新选择打开的子窗口
deviationFrm.Activate();
}
}
//释放跑偏界面示例事件
private void ReleaseObjct_Deviation(object sender, FormClosingEventArgs e)
{
//释放实例
deviationFrm = null;
}
