/// <summary>
/// Disables the system menu "Close" menu command, as well as the "X" close button on the window title bar.
/// </summary>
/// <remarks>
/// Note to implementors: This method may *not* be implemented as a no-op. The purpose is to make it so that
/// calling the Close() method is the only way to close a dialog, which is something that can only be done
/// programmatically.
/// </remarks>
public static void DisableCloseBox(IWin32Window window)
{
IntPtr hWnd = window.Handle;
IntPtr hMenu = SafeNativeMethods.GetSystemMenu(hWnd, false);
if (hMenu == IntPtr.Zero)
{
NativeMethods.ThrowOnWin32Error("GetSystemMenu() returned NULL");
}
int result = SafeNativeMethods.EnableMenuItem(
hMenu,
NativeConstants.SC_CLOSE,
NativeConstants.MF_BYCOMMAND | NativeConstants.MF_GRAYED);
bool bResult = SafeNativeMethods.DrawMenuBar(hWnd);
if (!bResult)
{
NativeMethods.ThrowOnWin32Error("DrawMenuBar returned FALSE");
}
GC.KeepAlive(window);
}
