方法一：Rectangle bounds = Screen.GetBounds(Point.Empty);            using (Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height))            {                using (Graphics g = Graphics.FromImage(bitmap))                {                    g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);                }                bitmap.Save("test.jpg", ImageFormat.Jpeg);            }

方法二：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.InteropServices;

using System.Drawing;

using System.Drawing.Imaging;

namespace Video.Model

{

    class ScreenCapture

    {

         /// <summary>

        /// Creates an Image object containing a screen shot of the entire desktop

        /// </summary>

        /// <returns></returns>

        public Image CaptureScreen()

        {

            return CaptureWindow( User32.GetDesktopWindow() );

        }

        /// <summary>

        /// Creates an Image object containing a screen shot of a specific window

        /// </summary>

        /// <param name="handle">The handle to the window. (In windows forms, this is obtained by the Handle property)</param>

        /// <returns></returns>

        public Image CaptureWindow(IntPtr handle)

        {

            // get te hDC of the target window

            IntPtr hdcSrc = User32.GetWindowDC(handle);

            // get the size

            User32.RECT windowRect = new User32.RECT();

            User32.GetWindowRect(handle,ref windowRect);

            int width = windowRect.right - windowRect.left;

            int height = windowRect.bottom - windowRect.top;

            // create a device context we can copy to

            IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);

            // create a bitmap we can copy it to,

            // using GetDeviceCaps to get the width/height

            IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc,width,height);

            // select the bitmap object

            IntPtr hOld = GDI32.SelectObject(hdcDest,hBitmap);

            // bitblt over

            GDI32.BitBlt(hdcDest,0,0,width,height,hdcSrc,0,0,GDI32.SRCCOPY);

            // restore selection

            GDI32.SelectObject(hdcDest,hOld);

            // clean up

            GDI32.DeleteDC(hdcDest);

            User32.ReleaseDC(handle,hdcSrc);

            // get a .NET image object for it

            Image img = Image.FromHbitmap(hBitmap);

            // free up the Bitmap object

            GDI32.DeleteObject(hBitmap);

            return img;

        }

        /// <summary>

        /// Captures a screen shot of a specific window, and saves it to a file

        /// </summary>

        /// <param name="handle"></param>

        /// <param name="filename"></param>

        /// <param name="format"></param>

        public void CaptureWindowToFile(IntPtr handle, string filename, ImageFormat format)

        {

            Image img = CaptureWindow(handle);

            img.Save(filename,format);

        }

        /// <summary>

        /// Captures a screen shot of the entire desktop, and saves it to a file

        /// </summary>

        /// <param name="filename"></param>

        /// <param name="format"></param>

        public void CaptureScreenToFile(string filename, ImageFormat format)

        {

            Image img = CaptureScreen();

            img.Save(filename,format);

        }

        /// <summary>

        /// Helper class containing Gdi32 API functions

        /// </summary>

        private class GDI32

        {

            public const int SRCCOPY = 0x00CC0020; // BitBlt dwRop parameter

            [DllImport("gdi32.dll")]

            public static extern bool BitBlt(IntPtr hObject,int nXDest,int nYDest,

                int nWidth,int nHeight,IntPtr hObjectSource,

                int nXSrc,int nYSrc,int dwRop);

            [DllImport("gdi32.dll")]

            public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC,int nWidth,

                int nHeight);

            [DllImport("gdi32.dll")]

            public static extern IntPtr CreateCompatibleDC(IntPtr hDC);

            [DllImport("gdi32.dll")]

            public static extern bool DeleteDC(IntPtr hDC);

            [DllImport("gdi32.dll")]

            public static extern bool DeleteObject(IntPtr hObject);

            [DllImport("gdi32.dll")]

            public static extern IntPtr SelectObject(IntPtr hDC,IntPtr hObject);

        }

        /// <summary>

        /// Helper class containing User32 API functions

        /// </summary>

        private class User32

        {

            [StructLayout(LayoutKind.Sequential)]

            public struct RECT

            {

                public int left;

                public int top;

                public int right;

                public int bottom;

            }

            [DllImport("user32.dll")]

            public static extern IntPtr GetDesktopWindow();

            [DllImport("user32.dll")]

            public static extern IntPtr GetWindowDC(IntPtr hWnd);

            [DllImport("user32.dll")]

            public static extern IntPtr ReleaseDC(IntPtr hWnd,IntPtr hDC);

            [DllImport("user32.dll")]

            public static extern IntPtr GetWindowRect(IntPtr hWnd,ref RECT rect);

        }

    }

   

}

 

 

ScreenCapture sc = new ScreenCapture();

            // capture entire screen, and save it to a file

            Image img = sc.CaptureScreen();

            // display image in a Picture control named imageDisplay

            //this.imageDisplay.Image = img;

            this.pictureBox1.Image = img;

            // capture this window, and save it

            sc.CaptureWindowToFile(this.Handle, "C:\\temp2.jpg", ImageFormat.Jpeg);