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   //創建一個以當前屏幕為模板的圖象   Control ctl = new Control();  Graphics g1 = ctl.CreateGraphics();  //創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();  //調用此API函數，實現屏幕捕獲   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);