C#创建不规则窗体的4种方式详解

poin[4].x = 0; poin[4].y = Width;

Boolean flag = true; IntPtr hRgn = CreatePolygonRgn(ref poin[0], 8, 1);

SetWindowRgn(this.Handle, hRgn, ref flag); this.BackColor = Color.BurlyWood;

} [StructLayout(LayoutKind.Sequential)]

private struct POINTAPI {

internal int x; internal int y;

} [DllImport("gdi32.dll")]

private static extern IntPtr CreatePolygonRgn(ref POINTAPI lpPoint,int nCount,int nPolyFillMode); [DllImport("user32.dll")]

private static extern IntPtr SetWindowRgn(IntPtr hWnd,IntPtr hRgn, ref Boolean bRedraw); //设置窗体显示状态

[DllImport("user32.dll")] private static extern int SetWindowPos(IntPtr hwnd,int hWndInsertAfter,int x,int y,int cx,int cy,int wFlags);

private void Start_Btn_Click(object sender, EventArgs e) {//始终显示在前面

SetWindowPos(this.Handle, -1, 0, 0, 0, 0, 1); }

private void button1_Click(object sender, EventArgs e) {

//最小化始终显示在前面 SetWindowPos(this.Handle, -1, 0, 0, 0, 0, 0);

}

当然，我们也可以自定义窗体的动作，如按着某个轨迹一定，下面的代码中的BackgroundForm程序中就小试了一下，效果还不错，下面是这些程序的效果图：