private void init第四步()
 {
     if (tForm选定常用菜肴 == null)
     {
         tForm选定常用菜肴 = new Form选定常用菜肴();
     }
 }
        private void button6_Click(object sender, EventArgs e)
        {
            if (tForm选定常用菜肴 == null)
            {
                tForm选定常用菜肴 = new Form选定常用菜肴();
            }

            DialogResult tDialogResult = tForm选定常用菜肴.ShowDialog();
        }