private void Menu_店员管理_Click(object sender, EventArgs e) { 店员界面 fm = 店员界面.Cteate(); fm.Show(); fm.Focus(); }
public static 店员界面 Cteate() { if (_form == null) { _form = new 店员界面(); } return(_form); }
private void 店员界面_FormClosing(object sender, FormClosingEventArgs e) { _form = null; }