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