C#用GDI画任意形状的form

C#用GDI画任意形状的form代码：代码放在窗体Paint事件中：

List list = new List();//首先构构造好窗体的边缘的点

list.Add(new Point(0, 4));

...//添加边缘点到list

Point[] points = list.ToArray();//将点集合赋给点数组

GraphicsPath shape = new GraphicsPath();

shape.AddPolygon(points);

//将窗体转换为构造好的点形成的形状

this.Region = new System.Drawing.Region(shape);