利用Region.IsVisible方法

示例代码：

Point[] points2 = { new Point(15, 15), new Point(90, 20), new Point(130, 160), new Point(60, 160), new Point(5, 80) };

GraphicsPath path = new GraphicsPath();

path.AddPolygon(points2);

path.CloseFigure();

Region region = new Region(path);

Point point = new Point(10, 10);

if (region.IsVisible(point))

 

此方法对于点在区域边界的情况，判断是在区域外。