private void Button_Click(object sender, RoutedEventArgs e)
{
Bitmap image = VisualToBitmapConverter.GetBitmap(border,
(int)border.ActualWidth, (int)border.ActualHeight);
image.Save(@"C:\YourPath\test.png");
}
private static async Task <BitmapSource> RenderAsync(System.Windows.Media.Brush brush, Rect helperWindowLocation, Size snapshotSize)
{
// Create a tmp window with its own hwnd to render it later
var window = new Window {
WindowStyle = WindowStyle.None, ResizeMode = ResizeMode.NoResize, ShowInTaskbar = false, Background = System.Windows.Media.Brushes.White
};
window.Left = helperWindowLocation.X;
window.Top = helperWindowLocation.Y;
window.Width = helperWindowLocation.Width;
window.Height = helperWindowLocation.Height;
window.ShowActivated = false;
var content = new Grid()
{
Background = brush
};
RenderOptions.SetBitmapScalingMode(content, BitmapScalingMode.HighQuality);
window.Content = content;
var handle = new WindowInteropHelper(window).EnsureHandle();
window.Show();
// Make sure the tmp window is under our mainwindow to hide it
SetWindowPos(handle, _HwndBottom, 0, 0, 0, 0, _SWP_NOMOVE | _SWP_NOSIZE | _SWP_NOACTIVATE);
//Wait for the element to render
//await popupChild.WaitForLoaded();
await window.WaitForFullyRendered();
////Why we have to wait here fore the visualbrush to finish its lazy rendering Process?
//// Todo: It seems like very complex uielements does not finish its rendering process within one renderloop
//// Check https://stackoverflow.com/questions/2851236/rendertargetbitmap-resourced-visualbrush-incomplete-image
// Async BitBlt the tmp Window
var bitmapSourceT = await Task.Run(() =>
{
Bitmap bitmap = VisualToBitmapConverter.GetBitmap(handle,
(int)snapshotSize.Width, (int)snapshotSize.Height);
var bitmapSource = new SharedBitmapSource(bitmap);
bitmapSource.Freeze();
return(bitmapSource);
});
// Close the Window
window.Close();
return(bitmapSourceT);
}
