winform标题栏自定义样式

#region 改变窗口样式         #if !DEBUG         [DllImport ("User32.dll")]         private static extern IntPtr GetWindowDC(IntPtr hwnd);         [DllImport ("User32.dll")]         private static extern int ReleaseDC(IntPtr hwnd, IntPtr hdc);         protected override void WndProc(ref Message m)         ...{                      base.WndProc(ref m);                          switch(m.Msg)                          ...{                     case 0x86://WM_NCACTIVATE                         goto case 0x85;                     case 0x85://WM_NCPAINT                     ...{                                                             IntPtr hDC = GetWindowDC(m.HWnd);                              //把DC转换为.NET的Graphics就可以很方便地使用Framework提供的绘图功能了                         Graphics gs = Graphics.FromHdc(hDC);                         处理色彩#region 处理色彩                         int ibox = 1;                         if (this.MaximizeBox) ibox ++;                         if (this.MinimizeBox) ibox ++;                         //得到相关背景图片                         Image imgpm = Image.FromFile( Application.StartupPath+ @"Main.bmp");