private void 打开OToolStripMenuItem_Click(object sender, EventArgs e) { frmTxt MDIChid = new frmTxt(); MDIChid.MdiParent = this; MDIChid.Show(); }
private void 打开OToolStripMenuItem_Click(object sender, EventArgs e) { frmTxt MDIChild = new frmTxt(); MDIChild.MdiParent = this; // 设置子窗体的父窗体 MDIChild.Show(); // 创建并显示一个子窗体 }