private void dataLine_Click(object sender, EventArgs e) { if (this.checkChildFrmExist("数据曲线") == true) { return; } dataline.Form1 frm = new dataline.Form1(); frm.MdiParent = this; frm.Text = "数据曲线"; frm.Show(); frm.WindowState = FormWindowState.Maximized; // frm.FormBorderStyle = FormBorderStyle.None; }