Winform窗体最大化的时候，如何指定窗体的位置、大小

public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
} private void Form2_SizeChanged(object sender, EventArgs e)
{
int height, width, newformx, newformy;
height = System.Windows.Forms.SystemInformation.WorkingArea.Height;
width = System.Windows.Forms.SystemInformation.WorkingArea.Width;
switch (this.WindowState)
{
case FormWindowState.Maximized://最大化操作
this.Width = width;
this.Height = height - 50;
newformx = 0;
newformy = 50;
this.SetDesktopLocation(newformx, newformy);
break;
case FormWindowState.Normal://默认窗口大小
this.Width = 808;
this.Height = 618;
newformx = 0;
newformy = 50;
this.SetDesktopLocation(newformx, newformy);
break;
}
}
}

public partial class Form2 : Form
{
private const long WM_GETMINMAXINFO = 0x24; public struct PointAPI
{
public int x;
public int y;
} public struct MinMaxInfo
{
public PointAPI ptReserved;
public PointAPI ptMaxSize;
public PointAPI ptMaxPosition;
public PointAPI ptMinTrackSize;
public PointAPI ptMaxTrackSize;
} public Form2()
{
InitializeComponent();
this.MaximumSize = new Size(Screen.PrimaryScreen.WorkingArea.Width, Screen.PrimaryScreen.WorkingArea.Height);
} protected override void WndProc(ref System.Windows.Forms.Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_GETMINMAXINFO)
{
MinMaxInfo mmi = (MinMaxInfo)m.GetLParam(typeof(MinMaxInfo));
mmi.ptMinTrackSize.x = this.MinimumSize.Width;
mmi.ptMinTrackSize.y = this.MinimumSize.Height;
if (this.MaximumSize.Width != 0 || this.MaximumSize.Height != 0)
{
mmi.ptMaxTrackSize.x = this.MaximumSize.Width;
mmi.ptMaxTrackSize.y = this.MaximumSize.Height;
}
mmi.ptMaxPosition.x = 1;
mmi.ptMaxPosition.y = 1;
System.Runtime.InteropServices.Marshal.StructureToPtr(mmi, m.LParam, true);
}
}
}