Print

PrintDocument实例所有的订阅事件如下：

1.创建一个PrintDocument的实例.如下：
System.Drawing.Printing.PrintDocument docToPrint =
   new System.Drawing.Printing.PrintDocument();
2.设置打印机开始打印的事件处理函数.函数原形如下：
void docToPrint_PrintPage(object sender,
   System.Drawing.Printing.PrintPageEventArgs e)
3.将事件处理函数添加到PrintDocument的PrintPage事件中。
docToPrint.PrintPage+=new PrintPageEventHandler(docToPrint_PrintPage);
4.设置PrintDocument的相关属性，如：
PrintDialog1.AllowSomePages = true;PrintDialog1.ShowHelp = true;
5.把PrintDialog的Document属性设为上面配置好的PrintDocument的实例：
PrintDialog1.Document = docToPrint;
6.调用PrintDialog的ShowDialog函数显示打印对话框：
DialogResult result = PrintDialog1.ShowDialog();
7.根据用户的选择，开始打印：
if (result==DialogResult.OK)
   {
    docToPrint.Print();
   }
8.打印预览控件PrintPreviewDialog
例子如下：

使用时先创建PrintService类的实例，然后调用void StartPrint(Stream streamToPrint,string streamType)函数开始打印。其中streamToPrint是要打印的内容（字节流），streamType是流的类型（txt表示普通文本，image表示图像）；

public partial class PrintTxt
{
      private   PrintPreviewDialog PrintPreview = new PrintPreviewDialog();
      private   string    StreamType;
      private   Image image = null;
      private   Stream StreamToPrint = null;
      Font mainFont = new Font("宋体", 12);//打印的字体
      public string Filename =null;


    //1、实例化打印文档
    PrintDocument pdDocument = new PrintDocument();
    private string[] lines;
    private int linesPrinted;


    public PrintTxt(string filepath,string filetype)
    {


         Filename = Path.GetFileNameWithoutExtension(filepath);

        //订阅BeginPrint事件
        pdDocument.BeginPrint += new PrintEventHandler(pdDocument_BeginPrint);
        //訂閱EndPrint事件，释放资源


        pdDocument.PrintPage += new PrintPageEventHandler(OnPrintPage);


        //订阅Print打印事件,该方法必须放在订阅打印事件的最后
        FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read);
        StartPrint(fs, filetype);


        //打印结束
        pdDocument.EndPrint += new PrintEventHandler(pdDocument_EndPrint);



    }

    //2、启动Print打印方法
    public   void StartPrint(Stream streamToPrint, string streamType)
    {

        //返回值的PageSettings A4\A5
        PageSettings ps = new PageSettings();
         //显示设置打印页对话框
     PageSetupDialog Psdl = new PageSetupDialog();

        //打印多份设置，注意，该方法需放在printpage方法后面。
     PrintDialog pt = new PrintDialog();
        pt.AllowCurrentPage = true;
        pt.AllowSomePages = true;
        pt.AllowPrintToFile = true;

         StreamToPrint = streamToPrint;//打印的字节流
     StreamType = streamType; //打印的类型
     pdDocument.DocumentName = Filename; //打印的文件名

     Psdl.Document = pdDocument;
        PrintPreview.Document = pdDocument;
        pt.Document = pdDocument;

        Psdl.PageSettings = pdDocument.DefaultPageSettings;
        try
        {
            //显示对话框

            if (Psdl.ShowDialog() == DialogResult.OK)
            {
                ps = Psdl.PageSettings;
                pdDocument.DefaultPageSettings = Psdl.PageSettings;
            }

            if (pt.ShowDialog() == DialogResult.OK)
            {
                pdDocument.PrinterSettings.Copies = pt.PrinterSettings.Copies;
                pdDocument.Print();
            }
           if(PrintPreview.ShowDialog()==DialogResult.OK )
            //调用打印
              pdDocument.Print();


             * PrintDocument对象的Print()方法在PrintController类中执行PrintPage事件。
             */
        }
        catch (InvalidPrinterException ex)
        {
            MessageBox.Show(ex.Message, "Simple Editor", MessageBoxButtons.OK, MessageBoxIcon.Error);
            throw;
        }
    }

    /// <summary>
    /// 3、得到打印內容
    /// 每个打印任务只调用OnBeginPrint()一次。
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void pdDocument_BeginPrint(object sender, PrintEventArgs e)
    {
        char[] param = { '\n' };
        char[] trimParam = { '\r' };//回车

        switch (StreamType)
        {
            case "txt":
                StringBuilder text = new StringBuilder();
                System.IO.StreamReader streamReader = new StreamReader(StreamToPrint, Encoding.Default);
                while (streamReader.Peek() >= 0)
                {
                    lines = streamReader.ReadToEnd().Split(param);
                    for (int i = 0; i < lines.Length; i++)
                    {
                        lines[i] = lines[i].TrimEnd(trimParam);
                    }
                }

                break;
            case "image":
                image = System.Drawing.Image.FromStream(StreamToPrint);
                break;
            default:
                break;
        }

    }



    /// <summary>
    /// 4、绘制多个打印界面
    /// printDocument的PrintPage事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void OnPrintPage(object sender, PrintPageEventArgs e)
    {
        int leftMargin = Convert.ToInt32((e.MarginBounds.Left) * 3 / 4);　 //左边距
        int topMargin = Convert.ToInt32(e.MarginBounds.Top * 2 / 3);　　　 //顶边距
        switch (StreamType)
        {
            case "txt":
                while (linesPrinted < lines.Length)
                {
                    //向画布中填写内容
                    e.Graphics.DrawString(lines[linesPrinted++], new Font("Arial", 10), Brushes.Black, leftMargin, topMargin, new StringFormat());

                    topMargin += 55;//行高为55，可调整

                    //走纸换页
                    if (topMargin >= e.PageBounds.Height - 60)//页面累加的高度大于页面高度。根据自己需要，可以适当调整
                    {
                        //如果大于设定的高
                        e.HasMorePages = true;

                         /*
                         * PrintPageEventArgs类的HaeMorePages属性为True时，通知控件器，必须再次調用OnPrintPage()方法，打印一个页面。
                         * PrintLoopI()有一个用於每个要打印的页面的序例。如果HasMorePages是False，PrintLoop()就会停止。
                         */
                        return;
                    }
                }

                break;
            case "image"://一下涉及剪切图片,
                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(topMargin, leftMargin, width, height);
                //向画布写入图片
                for (int i = 0; i < Convert.ToInt32(Math.Floor((double)image.Height/ 820)) + 1; i++)
                {

                    e.Graphics.DrawImage(image, destRect, i*820,i*1170 , image.Width, image.Height, System.Drawing.GraphicsUnit.Pixel);
                    //走纸换页
                    if (i * 1170 >= e.PageBounds.Height - 60)//页面累加的高度大于页面高度。根据自己需要，可以适当调整
                    {
                        //如果大于设定的高
                        e.HasMorePages = true;

                        /*
                        * PrintPageEventArgs类的HaeMorePages属性为True时，通知控件器，必须再次調用OnPrintPage()方法，打印一个页面。
                        * PrintLoopI()有一个用於每个要打印的页面的序例。如果HasMorePages是False，PrintLoop()就会停止。
                        */
                        return;
                    }
                }

                break;
        }

        //打印完毕后，画线条，且注明打印日期
        e.Graphics.DrawLine(new Pen(Color.Black), leftMargin, topMargin, e.MarginBounds.Right, topMargin);

        string strdatetime = DateTime.Now.ToLongDateString() + DateTime.Now.ToLongTimeString();
        e.Graphics.DrawString(string.Format("打印时间：{0}", strdatetime), mainFont, Brushes.Black, e.MarginBounds.Right-240, topMargin+40, new StringFormat());
        linesPrinted = 0;
        //绘制完成后，关闭多页打印功能
        e.HasMorePages = false;

    }


    /// <summary>
    ///5、EndPrint事件,释放资源
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void pdDocument_EndPrint(object sender, PrintEventArgs e)
    {

        //变量Lines占用和引用的字符串数组，现在释放
        lines = null;
    }

}
//PrintTxt simple = new PrintTxt("D:\\Mainsoft\\12.txt", "txt");