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");
