private void pictureBox1_Click(object sender, EventArgs e)

        {

            ////实例化打印对象

            PrintDocument print = new PrintDocument();

            //打印事件

            print.PrintPage += new PrintPageEventHandler(print_PrintPage);

            //开始打印

            PrintDialog pd = new PrintDialog();

            if (pd.ShowDialog() == DialogResult.OK)

            {

                //print.PrinterSettings.DefaultPageSettings.Landscape = true;

                print.Print();

            }

            //打印之后删除保存在本地的图片

             print.EndPrint += new PrintEventHandler(print_EndPrint);

        }

        /// <summary>

        ///  LabHemodialysis产生的图保存的本地，并且获取

        /// </summary>

        /// <returns></returns>

        private Image get_Image() {

            Bitmap bmp;

            if (str_ItemName.Contains("/"))

            {

                string str_ItemNameRelapce = str_ItemName.Replace("/", "");

                LabHemodialysis.ExportToImage(@"C:\" + str_ItemNameRelapce + ".Jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);

                bmp = new Bitmap(@"C:\" + str_ItemNameRelapce + ".Jpeg");

            }

            else {

                //保存到c盘

                LabHemodialysis.ExportToImage(@"C:\" + str_ItemName + ".Jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);

                //从c盘获取图片

                bmp = new Bitmap(@"C:\" + str_ItemName + ".Jpeg");

            }

           return bmp;

        }

        //删除本地保存的图片

        private void delete_Image()

        {

            System.IO.FileInfo file = new System.IO.FileInfo(@"C:\" + str_ItemName + ".Jpeg");

            if (file.Exists)

            {

                file.Delete();

            }

        }

        private void print_EndPrint(object sender, PrintEventArgs e)

        {

            delete_Image();

        }

       private void print_PrintPage(object sender, PrintPageEventArgs e)

        {

            Image img = get_Image();

            Image rotataImage = Rotate((Bitmap)img, );

            e.Graphics.DrawImage(rotataImage,,); 

        }

       /// <summary>

       /// 以逆时针为方向对图像进行旋转

       /// </summary>

       /// <param name="b">位图流</param>

       /// <param name="angle">旋转角度[0,360](前台给的)</param>

       /// <returns></returns>

       private Bitmap Rotate(Bitmap b, int angle)

       {

           angle = angle % ;

           //弧度转换

           double radian = angle * Math.PI / 180.0;

           double cos = Math.Cos(radian);

           double sin = Math.Sin(radian);

           //原图的宽和高

           int w = b.Width;

           int h = b.Height;

           int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));

           int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));

           //目标位图

           Bitmap dsImage = new Bitmap(W, H);

           System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);

           g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;

           g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

           //计算偏移量

           Point Offset = new Point((W - w) / , (H - h) / );

           //构造图像显示区域：让图像的中心与窗口的中心点一致

           Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);

           Point center = new Point(rect.X + rect.Width / , rect.Y + rect.Height / );

           g.TranslateTransform(center.X, center.Y);

           g.RotateTransform( - angle);

           //恢复图像在水平和垂直方向的平移

           g.TranslateTransform(-center.X, -center.Y);

           g.DrawImage(b, rect);

           //重至绘图的所有变换

           g.ResetTransform();

           g.Save();

           g.Dispose();

           //dsImage.Save("yuancd.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

           return dsImage;

       }