WPF实现打印用户界面功能2

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using System; using System.Drawing.Printing; using System.IO; using System.Windows.Forms;   namespace PrintPage {     /// <summary>     /// 文件打印方法     /// </summary>     public class PrintService     {         public PrintService()         {             //将事件处理函数添加到PrintDocument的PrintPage中             this.docToPrint.PrintPage += new PrintPageEventHandler(docToPrint_PrintPage);         }           // Declare the PrintDocument object.         private string streamType;         private Stream streamToPrint;         private PrintDocument docToPrint = new PrintDocument();//创建一个PrintDocument的实例           // This method will set properties on the PrintDialog object and         // then display the dialog.         public void StartPrint(Stream streamToPrint, string streamType)         {             this.streamToPrint = streamToPrint;             this.streamType = streamType;             PrintDialog printDialog = new PrintDialog();//创建一个PrintDialog的实例             printDialog.AllowSomePages = true;             printDialog.ShowHelp = true;             // Set the Document property to the PrintDocument for             // which the PrintPage Event has been handled. To display the             // dialog, either this property or the PrinterSettings property             // must be set             printDialog.Document = docToPrint;//把PrintDialog的Document属性设为上面配置好的PrintDocument的实例             DialogResult result = printDialog.ShowDialog();//调用PrintDialog的ShowDialog函数显示打印对话框             // If the result is OK then print the document.             if (result == DialogResult.OK)             {                 docToPrint.Print();//开始打印             }         }           // The PrintDialog will print the document         // by handling the document’s PrintPage event.         private void docToPrint_PrintPage(object sender,         System.Drawing.Printing.PrintPageEventArgs e)//设置打印机开始打印的事件处理函数         {             // Insert code to render the page here.             // This code will be called when the control is drawn.             // The following code will render a simple             // message on the printed document             switch (this.streamType)             {                 case "txt":                     string text = null;                     System.Drawing.Font printFont = new System.Drawing.Font                     ("Arial", 35, System.Drawing.FontStyle.Regular);                     // Draw the content.                     System.IO.StreamReader streamReader = new StreamReader(this.streamToPrint);                     text = streamReader.ReadToEnd();                     e.Graphics.DrawString(text, printFont, System.Drawing.Brushes.Black, e.MarginBounds.X, e.MarginBounds.Y);                     break;                 case "image":                     System.Drawing.Image image = System.Drawing.Image.FromStream(this.streamToPrint);                     int x = e.MarginBounds.X;                     int y = e.MarginBounds.Y;                     int width = image.Width;                     int height = image.Height;                     if ((width / e.MarginBounds.Width) > (height / e.MarginBounds.Height))                     {                         width = e.MarginBounds.Width;                         height = image.Height * e.MarginBounds.Width / image.Width;                     }                     else                     {                         height = e.MarginBounds.Height;                         width = image.Width * e.MarginBounds.Height / image.Height;                     }                     System.Drawing.Rectangle destRect = new System.Drawing.Rectangle(x, y, width, height);                     e.Graphics.DrawImage(image, destRect, 0, 0, image.Width, image.Height, System.Drawing.GraphicsUnit.Pixel);                     break;                 default:                     break;             }         }     } }

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private Stream FileToStream(string fileName)       {           // 打开文件           FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);             // 读取文件的 byte[]           byte[] bytes = new byte[fileStream.Length];           fileStream.Read(bytes, 0, bytes.Length);           fileStream.Close();             // 把 byte[] 转换成 Stream           Stream stream = new MemoryStream(bytes);             return stream;       }

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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;        }

　//调用     

  private String filePath = "c:\\test.bmp";

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private void button4_Click(object sender, RoutedEventArgs e)        {            string path = AppDomain.CurrentDomain.BaseDirectory;            FileInfo file = new FileInfo(path);            path = file.Directory.Parent.Parent.FullName + "\\MainWindow.xaml";            //path = file.Directory.FullName + "\\MainWindow.xaml";            Stream stream = FileToStream(filePath);            PrintService print = new PrintService();            print.StartPrint(stream, "image");        }