方式一：
public  bool Print(string pathStr)

        {

            try

            {

                if (File.Exists(pathStr) == false)

                    return false;

                var pr = new Process

                {

                    StartInfo =

                    {

                        FileName = pathStr,

                        CreateNoWindow = true,

                        WindowStyle = ProcessWindowStyle.Hidden,

                        Verb = "Print"//printo、edit、open
//printto  调用默认打印机打印
//open     打开图片

                    }

                };

                pr.Start();

                return true;

            }

            catch (Exception)

            {

                return false;

            }

        }

//等价于==》

private void PrintImage(string filePath)
{
　　Process process = new Process();

　　　process.StartInfo.FileName ="filePath";

 　　string[] items=process.StartInfo.Verbs;
　　 process.StartInfo.Verb = "printto";
　　 process.StartInfo.CreateNoWindow = true;
　　 process.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
　　 process.Start();

}

        private void SaveWindowToImage(Window window, string fileName)

        {

            FrameworkElement element = window.Content as FrameworkElement;

            RenderTargetBitmap bmp = new RenderTargetBitmap((int)element.ActualWidth,

                (int)element.ActualHeight, 96d, 96d, PixelFormats.Default);

            bmp.Render(window);

            BmpBitmapEncoder encoder = new BmpBitmapEncoder();

            encoder.Frames.Add(BitmapFrame.Create(bmp));

            using(FileStream stream=File.Open(fileName,FileMode.OpenOrCreate))

            {

                encoder.Save(stream);

            }

        }

private string SaveWindowToImage(Window window, string fileName)

        {

            FrameworkElement element = window.Content as FrameworkElement;

            RenderTargetBitmap bmp = new RenderTargetBitmap((int)element.ActualWidth,

                (int)element.ActualHeight, 96d, 96d, PixelFormats.Default);

            bmp.Render(window);

            BmpBitmapEncoder encoder = new BmpBitmapEncoder();

            encoder.Frames.Add(BitmapFrame.Create(bmp));

            using (FileStream stream = File.Open(fileName, FileMode.OpenOrCreate))

            {

                encoder.Save(stream);

            }

            return fileName;

        }

SolidBrush brush = new SolidBrush(System.Drawing.Color.Black);

        Font DrawFont = new Font("Arial", 22);

        private PrintDocument pd = new PrintDocument();

        private void button3_Click(object sender, RoutedEventArgs e)

        {

            pd.PrintPage += PicturePrintDocument_PrintPage; //注册打印事件

            //pd.PrinterSettings.PrinterName = "HP LaserJet Professional M1213nf MFP";        //打印机选择

            pd.Print();   // =>就似这么简单

        }

        /// <summary>

        /// 打印事件

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void PicturePrintDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)

        {
　　         System.Drawing.Image img = new Bitmap(filePath);

            e.Graphics.DrawImage(img, 50, 50);

            //e.Graphics.DrawString("aaa", DrawFont, brush, 600, 600); //绘制字符串

            e.HasMorePages = false;

        }
//filePath=SaveWindowToImage(this,"c:\\test.bmp");