Unable to instantiate "Pen"

[javaCR7]

[chenzanyu]

can Use

var pen =Pens.DashDot(prediction.Label.Color, 1);
image.Mutate(a => a.DrawPolygon(pen,
        new PointF(prediction.Rectangle.Left, prediction.Rectangle.Top),
        new PointF(prediction.Rectangle.Right, prediction.Rectangle.Top),
        new PointF(prediction.Rectangle.Right, prediction.Rectangle.Bottom),
        new PointF(prediction.Rectangle.Left, prediction.Rectangle.Bottom)
    ));