/// <summary>
/// Render the frameworkElement to a BitmapSource
/// </summary>
/// <param name="frameworkElement">FrameworkElement</param>
/// <param name="size">Size, using the bound as size by default</param>
/// <param name="dpiX">Horizontal DPI settings</param>
/// <param name="dpiY">Vertical DPI settings</param>
/// <returns>BitmapSource</returns>
public static BitmapSource ToBitmapSource(this FrameworkElement frameworkElement, Size?size = null, double dpiX = 96.0, double dpiY = 96.0)
{
if (frameworkElement == null)
{
throw new ArgumentNullException(nameof(frameworkElement));
}
// Make sure we have a size
if (!size.HasValue)
{
var bounds = VisualTreeHelper.GetDescendantBounds(frameworkElement);
size = bounds != Rect.Empty ? bounds.Size : new Size(16, 16);
}
// Create a viewbox to render the frameworkElement in the correct size
var viewbox = new Viewbox
{
//frameworkElement to render
Child = frameworkElement
};
viewbox.Measure(size.Value);
viewbox.Arrange(new Rect(new Point(), size.Value));
viewbox.UpdateLayout();
var renderTargetBitmap = new RenderTargetBitmap((int)(size.Value.Width * dpiX / 96.0),
(int)(size.Value.Height * dpiY / 96.0),
dpiX,
dpiY,
PixelFormats.Pbgra32);
var drawingVisual = new DrawingVisual();
using (var drawingContext = drawingVisual.RenderOpen())
{
var visualBrush = new VisualBrush(viewbox);
drawingContext.DrawRectangle(visualBrush, null, new Rect(new Point(), size.Value));
}
renderTargetBitmap.Render(drawingVisual);
// Disassociate the frameworkElement from the viewbox
viewbox.RemoveChild(frameworkElement);
return(renderTargetBitmap);
}