WPF实现打印用户界面功能

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);
            }
        }

调用方式如下：

SaveWindowToImage(this,"c:\test.bmp");
Print("c:\test.bmp");

实现思路：用户界面转换为图片，打印图片文件。

方式二：

第一步，将WPF用户界面转换为图片

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;
        }

第二步，打印图片

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");