public void Show() { _VerifyMutability(); using (Stream imageStream = _GetImageStream()) { Size bitmapSize; _hBitmap = _CreateHBITMAPFromImageStream(imageStream, out bitmapSize); Point location = new Point( (NativeMethods.GetSystemMetrics(SM.CXSCREEN) - bitmapSize.Width) / 2, (NativeMethods.GetSystemMetrics(SM.CYSCREEN) - bitmapSize.Height) / 2); // Pass a null WndProc. Let the MessageWindow use DefWindowProc. _hwndWrapper = new MessageWindow( CS.HREDRAW | CS.VREDRAW, WS.POPUP | WS.VISIBLE, WS_EX.WINDOWEDGE | WS_EX.TOOLWINDOW | WS_EX.LAYERED | (IsTopMost ? WS_EX.TOPMOST : 0), new Rect(location, bitmapSize), "Splash Screen", null); byte opacity = (byte)(FadeInDuration > TimeSpan.Zero ? 0 : 255); using (SafeDC hScreenDC = SafeDC.GetDesktop()) { using (SafeDC memDC = SafeDC.CreateCompatibleDC(hScreenDC)) { IntPtr hOldBitmap = NativeMethods.SelectObject(memDC, _hBitmap); RECT hwndRect = NativeMethods.GetWindowRect(_hwndWrapper.Handle); POINT hwndPos = hwndRect.Position; SIZE hwndSize = hwndRect.Size; POINT origin = new POINT(); BLENDFUNCTION bf = _BaseBlendFunction; bf.SourceConstantAlpha = opacity; NativeMethods.UpdateLayeredWindow(_hwndWrapper.Handle, hScreenDC, ref hwndPos, ref hwndSize, memDC, ref origin, 0, ref bf, ULW.ALPHA); NativeMethods.SelectObject(memDC, hOldBitmap); } } if (CloseOnMainWindowCreation) { Dispatcher.CurrentDispatcher.BeginInvoke( DispatcherPriority.Loaded, (DispatcherOperationCallback) delegate(object splashObj) { var splashScreen = (SplashScreen)splashObj; if (!splashScreen._isClosed) { splashScreen.Close(); } return(null); }, this); } _dispatcher = Dispatcher.CurrentDispatcher; if (FadeInDuration > TimeSpan.Zero) { _fadeInEnd = DateTime.UtcNow + FadeInDuration; _dt = new DispatcherTimer(FadeInDuration, DispatcherPriority.Normal, _FadeInTick, _dispatcher); _dt.Start(); } } }