如何在WPF中创建圆角形式？

<Path Fill="Blue" Stroke="Black" StrokeThickness="1">
    <Path.Data>
        <RoundRectangleGeometry RadiusX="10" RadiusY="10" Rect="0,0,100,50"/>
    </Path.Data>
</Path>

RoundRectangleGeometry roundRectangleGeometry = new RoundRectangleGeometry();
roundRectangleGeometry.RadiusX = 10;
roundRectangleGeometry.RadiusY = 10;
roundRectangleGeometry.Rect = new Rect(0, 0, 100, 50);

Path path = new Path();
path.Fill = Brushes.Blue;
path.Stroke = Brushes.Black;
path.StrokeThickness = 1;
path.Data = roundRectangleGeometry;