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Never ever close me – how to disable close button in WPF

Well, there is no such option in WPF. The only thing you can do is to go a bit down to unmanaged and hook WM messages to apply your own style to the system menu. How to do it? 

First of all, we have to know to to hook system events in WPF. For such action, we have HwndSource. I wrote a bit about it here and here, so it’s the simple one.

 protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);

            HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;

            if (hwndSource != null)
            {
                hwndSource.AddHook(new HwndSourceHook(this.hwndSourceHook));
            }

        }

        IntPtr hwndSourceHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {

Next, let’s do a bit of Interop

[DllImport("user32.dll")]
        static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);
        [DllImport("user32.dll")]
        static extern bool EnableMenuItem(IntPtr hMenu, uint uIDEnableItem, uint uEnable);



        const uint MF_BYCOMMAND = 0x00000000;
        const uint MF_GRAYED = 0x00000001;
        const uint MF_ENABLED = 0x00000000;

        const uint SC_CLOSE = 0xF060;

        const int WM_SHOWWINDOW = 0x00000018;
        const int WM_CLOSE = 0x10;

And now, we can hook WM_SHOWWINDOW and WM_CLOSE to apply those styles

IntPtr hwndSourceHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            if (msg == WM_SHOWWINDOW)
            {
                IntPtr hMenu = GetSystemMenu(hwnd, false);
                if (hMenu != IntPtr.Zero)
                {
                    EnableMenuItem(hMenu, SC_CLOSE, MF_BYCOMMAND | MF_GRAYED);
                }
            }
            else if (msg == WM_CLOSE)
            {
                handled = true;
            }
            return IntPtr.Zero;
        }

We done. Now just think about how to close such window Happy programming

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⟨ C#, Tips and Tricks, tutorial, WPF ⟩

September 26th, 2007 · Comments (6)