界面编程之设计多边形窗体

1. 新建一个工程demo

2. 添加以下引用

 

using System.Runtime.InteropServices;

[DllImport("gdi32")]
private static extern IntPtr CreatePolygonRgn(Point[] lpPoint,int nCount,int nPolyFillMode);
[DllImport("user32")]
private static extern IntPtr SetWindowRgn(IntPtr hWnd,IntPtr hRgn,bool bRedraw);
const int WINDING = 2;

 3. 添加窗体的Load方法：

 

private void 设计多边形窗体_Load(object sender, System.EventArgs e)
...{
    Point[] pt=...{
        new Point(this.Width /2,0),
        new Point(0,this.Height/2),
        new Point(this.Width/2,this.Height),
        new Point(this.Width,this.Height/2),
        new Point(this.Width,0)
        };    
        IntPtr m_rgn;
        m_rgn=CreatePolygonRgn(pt,5,WINDING);
        SetWindowRgn(this.Handle,m_rgn,true);
    }
}