private void 用户管理ToolStripMenuItem_Click(object sender, EventArgs e) { if (checkchildfrm("F_InfoManage") == false) { F_InfoManage F_ER = new F_InfoManage(); F_ER.MdiParent = this; F_ER.WindowState = FormWindowState.Maximized; F_ER.Text = "用户管理"; F_ER.Show(); } }