public static Depreciation GetInstance() { if (dlform == null || dlform.IsDisposed) { dlform = new Depreciation(); } return(dlform); }
private void barButtonItem折旧费用_ItemClick(object sender, ItemClickEventArgs e) { bool isopen = true; foreach (Form f in this.MdiChildren) { if (f.Name == "Depreciation") { f.Visible = true; f.Activate(); f.WindowState = FormWindowState.Maximized; isopen = false; break; } } if (isopen) { Depreciation Frm = Depreciation.GetInstance(); Frm.MdiParent = this; Frm.WindowState = FormWindowState.Maximized; Frm.Show(); } }