This 

is the code form the menu system that starts the XNA game.

    

var process = Process.Start(info);

    

var currentProcess = Process.GetCurrentProcess();

    

while (!process.HasExited)

    {

        Thread.Sleep(

50);

        

if (GetForegroundWindow() == currentProcess.MainWindowHandle)

        {

            Activate(process.MainWindowHandle);

        }

    }

This 

is the code that sets the XNA game 

as the foreground window.

        

///

 

<summary>

        

///

 Sets the window to be foreground

        

///

 

</summary>

        [DllImport(

"

User32

")]

        

private 

static 

extern 

int SetForegroundWindow(IntPtr hwnd);

 

        

///

 

<summary>

        

///

 Activate or minimize a window

        

///

 

</summary>

        [DllImportAttribute(

"

User32.DLL

")]

        

private 

static 

extern 

bool ShowWindow(IntPtr hWnd, 

int nCmdShow);

        

private 

const 

int SW_SHOW = 

5;

        

private 

const 

int SW_MINIMIZE = 

6;

        

private 

const 

int SW_RESTORE = 

9;

 

        

///

 

<summary>

        

///

 The GetForegroundWindow function returns a handle to the foreground window.

        

///

 

</summary>

        [DllImport(

"

user32.dll

")]

        

private 

static 

extern IntPtr GetForegroundWindow();

 

        

private 

static 

void Activate(IntPtr windowHandle)

        {

            ShowWindow(windowHandle, SW_RESTORE);

            SetForegroundWindow(windowHandle);

        }

 

 

//

设置幕大小,其中ChatForm为聊天WinForm窗体。

ChatForm form = 

new ChatForm();

                

int screenWidth = GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Width;

//

 System.Windows.Forms.SystemInformation.WorkingArea.Width;

                

int screenHeight = System.Windows.Forms.SystemInformation.WorkingArea.Height;

                form.Size = 

new System.Drawing.Size((

int)(screenWidth * 

0.2f * 

1000) / 

1000, (

int)(screenHeight));

                form.FormLocation = 

new System.Drawing.Point((

int)(screenWidth * 

0.8f * 

1000) / 

1000, 

0);

                form.Show();

          

                IntPtr ip = Window.Handle;

                System.Windows.Forms.Form gameForm = System.Windows.Forms.Control.FromHandle(ip) 

as System.Windows.Forms.Form;

                

if (gameForm != 

null)

                {

                    gameForm.Location = 

new System.Drawing.Point(

0, 

0);

                    gameForm.Size = 

new System.Drawing.Size((

int)(screenWidth * 

0.8f * 

1000) / 

1000, (

int)(screenHeight));

                }

===========================================================================================

int screenWidth = GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Width;

            

int screenHeight = GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Height;

            graphics.PreferredBackBufferWidth = (

int)(screenWidth * 

0.8f);

            graphics.PreferredBackBufferHeight = screenHeight;

this.Window.AllowUserResizing = 

true;

this.Window.ClientSizeChanged += 

new EventHandler<EventArgs>(Window_ClientSizeChanged);

//

获取除任务栏之外的显示屏高度

 System.Windows.Forms.SystemInformation.WorkingArea.Height;

///

/

string currentScreenSize_OutTaskBar=SystemInformation.WorkingArea.Width.ToString() + 

"

,

" +SystemInformation.WorkingArea.Height.ToString();

MessageBox.Show(

"

当前的屏幕除任务栏外的工作域大小为:

"+currentScreenSize_OutTaskBar);

///

/

///

/

string currentScreenSize=System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width.ToString() + 

"

,

" + System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height.ToString();

MessageBox.Show(

"

当前的屏幕包括任务栏的工作域大小为:

"+currentScreenSize);

///

/

///

/

Size OutTaskBarSize = 

new Size(SystemInformation.WorkingArea.Width, SystemInformation.WorkingArea.Height);

Size ScreenSize = 

new Size(System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width, System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height);

Size TaskBarSize;

TaskBarSize = 

new Size(

                (ScreenSize.Width - (ScreenSize.Width - OutTaskBarSize.Width)),

                (ScreenSize.Height - OutTaskBarSize.Height)

                );

MessageBox.Show(

"

任务栏大小：

" + TaskBarSize.Width + 

"

,

" + TaskBarSize.Height);

///

/