最近项目需要对界面进行截图并保存的功能，在网上搜索了下结合实际需求最终完成功能，代码如下

　　　//调用导图

　　　private void pictureBox4_Click(object sender, EventArgs e)

        {

            Bitmap bitmap = new Bitmap(this.Width, this.Height);

            DrawToBitmap(this, bitmap, new Rectangle(0, 0, this.Width, this.Height));

            bool isSave = true;

            SaveFileDialog saveImageDialog = new SaveFileDialog();             saveImageDialog.Title = "图片保存";             saveImageDialog.Filter = @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";             if (saveImageDialog.ShowDialog() == DialogResult.OK)             {                 string fileName = saveImageDialog.FileName.ToString();                 if (fileName != "" && fileName != null)                 {                     string fileExtName = fileName.Substring(fileName.LastIndexOf(".") + 1).ToString();                     System.Drawing.Imaging.ImageFormat imgformat = null;                     if (fileExtName != "")                     {                         switch (fileExtName)                         {                             case "jpg":                                 imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;                                 break;                             case "bmp":                                 imgformat = System.Drawing.Imaging.ImageFormat.Bmp;                                 break;                             case "gif":                                 imgformat = System.Drawing.Imaging.ImageFormat.Gif;                                 break;                             default:                                 MessageBox.Show("只能存取为: jpg,bmp,gif 格式");                                 isSave = false;                                 break;                         }

                    }

                    //默认保存为JPG格式                        if (imgformat == null)                     {                         imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;                     }                     if (isSave)                     {                         try                         {                             images.Save(fileName, imgformat);                             //MessageBox.Show("图片已经成功保存!");                            }                         catch                         {                             MessageBox.Show("保存失败,你还没有截取过图片或已经清空图片!");                         }                     }                 }             }

        }

 　　 [DllImport("user32.dll", CharSet = CharSet.Auto)]

        public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]

        public static extern IntPtr SendMessage(HandleRef hWnd, int msg, IntPtr wParam, IntPtr lParam);

        [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]

        public static extern bool BitBlt(HandleRef hDC, int x, int y, int nWidth, int nHeight, HandleRef hSrcDC, int xSrc, int ySrc, int dwRop);

        /// <summary>

        /// 支持呈现到指定的位图。         /// </summary>         public static Bitmap DrawToBitmap(Control control, Bitmap bitmap, Rectangle targetBounds)         {             if (bitmap == null)             {                 throw new ArgumentNullException("bitmap");             }             if (((targetBounds.Width <= 0) || (targetBounds.Height <= 0)) || ((targetBounds.X < 0) || (targetBounds.Y < 0)))             {                 throw new ArgumentException("targetBounds");             }             Bitmap image = new Bitmap(control.Width, control.Height, bitmap.PixelFormat);             using (Graphics graphics = Graphics.FromImage(image))             {                 IntPtr hdc = graphics.GetHdc();                 SendMessage(new HandleRef(control, control.Handle), 0x317, hdc, (IntPtr)30);                 using (Graphics graphics2 = Graphics.FromImage(bitmap))                 {                     IntPtr handle = graphics2.GetHdc();                     BitBlt(new HandleRef(graphics2, handle), 0, 0, control.Width, control.Height, new HandleRef(graphics, hdc), targetBounds.X, targetBounds.Y,

0xcc0020);

                    graphics2.ReleaseHdcInternal(handle);                 }                 graphics.ReleaseHdcInternal(hdc);             }             return image;         }

本文转自夜&枫博客园博客，原文链接：http://www.cnblogs.com/newstart/archive/2012/08/29/2662474.html，如需转载请自行联系原作者