Drawing control to memory (Bitmap)

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As the control has no parent container, you need to call Measure and Arrange in order to do a proper layout. As layout is done asynchronously (see Remarks in Measure and Arrange), you may also need to call UpdateLayout to force the layout to be updated immediately.

public BitmapSource RenderToBitmap(UIElement element, Size size)
{
    element.Measure(size);
    element.Arrange(new Rect(size));
    element.UpdateLayout();

    var bitmap = new RenderTargetBitmap(
        (int)size.Width, (int)size.Height, 96, 96, PixelFormats.Default);

    bitmap.Render(element);
    return bitmap;
}

In case you have already set the Width and Height of the element you may use that for the size parameter:

var grid = new Grid
{
    Width = 200,
    Height = 200,
    Background = Brushes.Yellow
};

grid.Children.Add(
    new Ellipse
    {
        Width = 100,
        Height = 100,
        Fill = Brushes.Blue
    });

var bitmap = RenderElement(grid, new Size(grid.Width, grid.Height));

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