private void toolStripButton2_Click(object sender, EventArgs e) { if (monitorForm.IsDisposed != true) { monitorForm.Show(); //弹出这个窗口 monitorForm.Focus(); //激活显示 } else { monitorForm = new MonitorForm(); monitorForm.Show(); //弹出这个窗口 monitorForm.Focus(); //激活显示 } }