日期:2014-05-18 浏览次数:20830 次
Form2 frmc1c2; private void Button1_Click(object sender, EventArgs e) { if (frmc1c2 == null || frmc1c2.IsDisposed) { frmc1c2 = new Form2(); frmc1c2.MdiParent = this; frmc1c2.Show(); } else { frmc1c2.Activate(); } }