base.Load+=MDIMain_Load //这句加到构造函数里
private void MDIMain_Load(System.Object sender , System.EventArgs e )
{
try{
Form fr = new Form();
foreach var fr2 in this.MdiChildren
{
if(fr2 is frmDGMMPPaking){
(fr2 as frmDGMMPPaking).Activate();
return;
}
}
fr = new frmDGMMPPaking();
fr.MdiParent = this;
fr.WindowState = FormWindowState.Maximized;
fr.Show();
}
catch{
}
}