public void MenuCall(object sender, CQMenuCallEventArgs e)
{
if (this.frmAppSetting == null)
{
this.frmAppSetting = new FrmAppSetting();
this.frmAppSetting.Closing += FrmAppSetting_Closing;
this.frmAppSetting.Show(); // 显示窗体
}
else
{
this.frmAppSetting.Activate(); // 将窗体调制到前台激活
}
}
private void FrmAppSetting_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
// 对变量置 null, 因为被关闭的窗口无法重复显示
this.frmAppSetting = null;
}