private void uSBToolStripMenuItem_Click(object sender, EventArgs e)
{
Mdi3USB mf3 = new Mdi3USB();
mf3.MdiParent = this;
mf3.Show();
}
private void MainForm_Load(object sender, EventArgs e)
{
//注意：设置属性
//必须：MainForm 窗口属性中 Icon 中 IsMdiContainer 设置为 True
//设置当前窗体为 MdiForm 的父窗体
Mdi1串口 mf1 = new Mdi1串口();
Mdi2网口 mf2 = new Mdi2网口();
Mdi3USB mf3 = new Mdi3USB();
Mdi4记事本 mf4 = new Mdi4记事本();
mf1.MdiParent = this;
mf2.MdiParent = this;
mf3.MdiParent = this;
mf4.MdiParent = this;
mf1.Show();
mf2.Show();
mf3.Show();
mf4.Show();
LayoutMdi(MdiLayout.TileVertical);//纵向排序
}