Code

void OffsetDashedLinks(DiagramNode node)
{
	foreach (DiagramLink link in node.OutgoingLinks)
	{
		if (link.Pen.DashStyle != DashStyle.Solid)
		{
			var points = link.ControlPoints;
			var n = points.Count - 1;
			var xOffset = (points[0].X > points[n].X) ?
				-1 :	// destination is to the left of origin
				+1;		// destination is to the right of origin
			points[0] = new PointF(points[0].X + xOffset, points[0].Y);
			points[1] = new PointF(points[1].X + xOffset, points[1].Y - 1);
			points[2] = new PointF(points[2].X + xOffset, points[2].Y - 1);
			points[3] = new PointF(points[3].X + xOffset, points[3].Y);
			link.UpdateFromPoints();
		}
	}
}