winform窗口控件随窗口变化

public static void AutoScale(Form frm)
{
frm.Tag = frm.Width.ToString() + "," + frm.Height.ToString();
frm.SizeChanged += new EventHandler(frm_SizeChanged);
}

static void frm_SizeChanged(object sender, EventArgs e)
{
string[] tmp = ((Form)sender).Tag.ToString().Split(',');
float width = (float)((Form)sender).Width / (float)Convert.ToInt16(tmp[0]);
float heigth = (float)((Form)sender).Height / (float)Convert.ToInt16(tmp[1]);
((Form)sender).Tag = ((Form)sender).Width.ToString() + "," + ((Form)sender).Height;
foreach (Control control in ((Form)sender).Controls)
{
control.Scale(new SizeF(width, heigth));
}
}