internal static void GetScreenShot( )
{
  //獲得當前屏幕的大小 
  Rectangle rect = new Rectangle();
  rect = Screen.AllScreens[0].WorkingArea;
   
  //計算圖片的大小，因為圖片的長和寬有可能超過目前屏幕的大小 
  //創(chuàng)建一個以當前屏幕為模板的圖象 
  Control ctl = new Control();
  Graphics g1 = ctl.CreateGraphics();
  //創(chuàng)建以屏幕大小為標準的位圖 
  Image MyImage = new Bitmap(rect.Width ,rect .Height, g1);

  Graphics g2 = Graphics.FromImage(MyImage);
  //得到屏幕的DC 
  IntPtr dc1 = g1.GetHdc();
  //得到Bitmap的DC 
  IntPtr dc2 = g2.GetHdc();
  //調(diào)用此API函數(shù)，實現(xiàn)屏幕捕獲 

  BitBlt(dc2, 0, 0, rect.Width, rect.Height, dc1, 0, 0, 13369376);
  //釋放掉屏幕的DC 
  g1.ReleaseHdc(dc1);
  //釋放掉Bitmap的DC 
  g2.ReleaseHdc(dc2);
  //以JPG文件格式來保存 
  //Image.GetThumbnailImageAbort myCallback = new Image.GetThumbnailImageAbort(ThumbnailCallback);
  //return MyImage.GetThumbnailImage(control.Width, control.Height, myCallback, IntPtr.Zero);
  MyImage.Save("D:\\aa.jpg");
 
}
[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
private static extern bool BitBlt(
 IntPtr hdcDest,  //目標設(shè)備的句柄
 int nXDest,    //目標對象的左上角的X坐標
 int nYDest,    //目標對象的左上角的X坐標
 int nWidth,    //目標對象的矩形的寬度
 int nHeight,    //目標對象的矩形的長度
 IntPtr hdcSrc,   //源設(shè)備的句柄
 int nXSrc,     //源對象的左上角的X坐標
 int nYSrc,     //源對象的左上角的X坐標
 System.Int32 dwRop //光柵的操作值
);