WPF 隐藏系统窗口菜单

        private IntPtr Hook(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam, ref bool handled)
        {
            if (msg == 0x112)
            {
                var param = wparam.ToInt32();
                if (param is 0xf093 // 单击打开菜单
                    || param is 0xf100)//键盘打开菜单
                {
                    handled = true;
                }
            }
            else if (msg == 0xa4)
            {
                var param = wparam.ToInt32();
                if (param == 0x02 // 非图片客户区
                    || param is 0x03)
                {
                    handled = true;
                }
            }

            return IntPtr.Zero;
        }

       public MainWindow()
        {
            InitializeComponent();

            SourceInitialized += OnSourceInitialized;
        }

        private void OnSourceInitialized(object sender, EventArgs e)
        {
            var windowInteropHelper = new WindowInteropHelper(this);
            var hwnd = windowInteropHelper.Handle;

            var windowLong = GetWindowLong(hwnd, GWL_STYLE);
            windowLong &= ~WS_SYSMENU;

            SetWindowLongPtr(hwnd, GWL_STYLE, new IntPtr(windowLong));
        }

        public const int WS_SYSMENU = 0x00080000;

        [DllImport("user32.dll", SetLastError = true)]
        public static extern int GetWindowLong(IntPtr hWnd, int nIndex);

        public const int GWL_STYLE = -16;

        public static IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong)
        {
            if (Environment.Is64BitProcess)
            {
                return SetWindowLongPtr64(hWnd, nIndex, dwNewLong);
            }

            return new IntPtr(SetWindowLong32(hWnd, nIndex, dwNewLong.ToInt32()));
        }

        [DllImport("user32.dll", EntryPoint = "SetWindowLong")]
        private static extern int SetWindowLong32(IntPtr hWnd, int nIndex, int dwNewLong);

        [DllImport("user32.dll", EntryPoint = "SetWindowLongPtr")]
        private static extern IntPtr SetWindowLongPtr64(IntPtr hWnd, int nIndex, IntPtr dwNewLong);