WPF full screen on maximize

I basically want to have my WPF window to go in full screen mode, when F11 is presse开发者_Python百科d or the maximize button in the right top corner of the window is pressed.

While the following works like a charm for pressing F11:

private void Window_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.F11)
    {
        WindowStyle = WindowStyle.None;
        WindowState = WindowState.Maximized;
        ResizeMode = ResizeMode.NoResize;
    }
}

This will still displays the Windows taskbar (tested with Windows 7):

protected override void OnStateChanged(EventArgs e)
{
    if (WindowState == WindowState.Maximized)
    {
        WindowStyle = WindowStyle.None;
        WindowState = WindowState.Maximized;
        ResizeMode = ResizeMode.NoResize;
    }
    base.OnStateChanged(e);
}

What am I missing here? Or can I do it even more elegant?

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WPF seems to be making the decision about whether to go full-screen or respect the taskbar based on the WindowStyle at the time of maximisation. So a kludgy but effective solution is to switch the window back to non-maximised, set the WindowStyle, and then set the window back to maximised again:

private bool _inStateChange;

protected override void OnStateChanged(EventArgs e)
{
  if (WindowState == WindowState.Maximized && !_inStateChange)
  {
    _inStateChange = true;
    WindowState = WindowState.Normal;
    WindowStyle = WindowStyle.None;
    WindowState = WindowState.Maximized;
    ResizeMode = ResizeMode.NoResize;
    _inStateChange = false;
  }
  base.OnStateChanged(e);
}

Although the code is obviously ugly, the transition to Normal and then back to Maximized doesn't seem to make the user experience any worse. On my display, I noticed flicker with both the F11 code and the kludge maximise, but not noticeably worse on the kludge maximise. But your mileage may vary!

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try this

Topmost="True" and WindowState="Maximized"

you can see your window will cover all screen and hide all with windows taskbar

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You need to set the Window.Topmost property.

Edit

Check this blog post Maximizing window (with WindowStyle=None) considering Taskbar

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Another solution that worked for me:

You can set the MaxHeight property of that window to SystemParameters.MaximizedPrimaryScreenHeight using the constructor.

public MainWindow()
{
    InitializeComponent();
    this.MaxHeight = SystemParameters.MaximizedPrimaryScreenHeight;
}

Warning: This might not work on extended desktop.

Source: Maximize window with WindowState Problem (application will hide windows taskbar)

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If you happen to be using WindowChrome to create a custom chrome experience, you'll need to set the GlassFrameThickness to something other than 0 (at least that was the last thing I needed to do to get the TaskBar to be hidden behind the window). That is in addition to the steps provided in the accepted answer.

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If there is still someone that need a smooth full screen of course tested only on windows 10! In windows 10 minimized do less flickering if you maintain this code order!

    public bool IsFullscreen = false;
    public WindowState lastWindowState;
    private void player_MouseDoubleClick(object sender, MouseButtonEventArgs e)
    {
        if (IsFullscreen)
        {
            this.WindowStyle = WindowStyle.SingleBorderWindow;
            this.WindowState = lastWindowState;
            IsFullscreen = false;

        }
        else
        {
            lastWindowState = this.WindowState;

            this.WindowStyle = WindowStyle.None;
            if (this.WindowState == WindowState.Maximized)
                this.WindowState = WindowState.Minimized;
            this.WindowState = WindowState.Maximized;
            IsFullscreen = true;
        }
    }

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You can hide the taskbar if you import user32.dll...

[DllImport("user32.dll")]
private static extern int FindWindow(string className, string windowText);
[DllImport("user32.dll")]
private static extern int ShowWindow(int hwnd, int command);

private const int SW_HIDE = 0;
private const int SW_SHOW = 1;

Usage:

int hwnd = FindWindow("Shell_TrayWnd","");
ShowWindow(hwnd,SW_HIDE);

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I have found easy way to achieve fullscreen in WPF:

    private double LastHeight, LastWidth;
    private System.Windows.WindowState LastState;

    private void Window_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.F11)
        {
            if (WindowStyle != WindowStyle.None)
            {
                LastHeight = Height;
                LastWidth = Width;
                LastState = WindowState;

                Topmost = true;
                Width = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width;
                Height = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height;
                Top = 0;
                Left = 0;
                WindowState = System.Windows.WindowState.Normal;
                WindowStyle = WindowStyle.None;
                ResizeMode = System.Windows.ResizeMode.NoResize;
            }
            else
            {
                WindowStyle = WindowStyle.SingleBorderWindow;
                WindowState = LastState; ;
                ResizeMode = ResizeMode.CanResizeWithGrip;
                Topmost = false;
                Width = LastWidth;
                Height = LastHeight;
            }
        }
    }

This works good in Windows 7 with fixed Taskbar.

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In my case, minimizing and maximizing will make the fullscreen size to be a little bit bigger than the screen, so the alternative I found is to temporarily set the Visibility to Collapsed then back to Visible afterwards to force redraw.

Visibility = Visibility.Collapsed;
WindowStyle = WindowStyle.None;
WindowState = WindowState.Maximized;
ResizeMode = ResizeMode.NoResize;
Visibility = Visibility.Visible;