C#实现打印功能具体的操作步骤如下：

 

创建一个PrintDialog的实例。如下：

 

System.Windows.Forms.PrintDialog PrintDialog1=new PrintDialog ();  

创建一个PrintDocument的实例.如下：

 

System.Drawing.Printing.PrintDocument docToPrint =   

  new System.Drawing.Printing.PrintDocument();  

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)  

将事件处理函数添加到PrintDocument的PrintPage事件中。

 

docToPrint.PrintPage+=  

  

new PrintPageEventHandler(docToPrint_PrintPage);   

设置PrintDocument的相关属性，如：

 

PrintDialog1.AllowSomePages =   

  

true;PrintDialog1.ShowHelp = true;   

把PrintDialog的Document属性设为上面配置好的PrintDocument的实例：

 

PrintDialog1.Document = docToPrint;  

调用PrintDialog的ShowDialog函数显示打印对话框：

 

DialogResult result = PrintDialog1.ShowDialog();  

根据用户的选择，开始打印：

 

if (result==DialogResult.OK)  

  {  

docToPrint.Print();  

  } 

C#实现打印功能的实例如下：

 

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）；

 

using System;  

using System.Drawing.Printing;  

using System.Windows.Forms;  

using System.IO;   

  

namespace EDImageSystem  

{  

  ///  <summary>  

  /// PrintService 的摘要说明。  

  ///  </summary>  

  public class PrintService  

  {  

public PrintService()  

{  

  //  

  // TODO: 在此处添加构造函数逻辑  

  //  

  this.docToPrint.PrintPage+=  

new PrintPageEventHandler(docToPrint_PrintPage);  

}//将事件处理函数添加到PrintDocument的PrintPage中   

  

// Declare the PrintDocument object.  

private System.Drawing.Printing.PrintDocument docToPrint =   

  new System.Drawing.Printing.PrintDocument();  

//创建一个PrintDocument的实例   

  

private System.IO.Stream streamToPrint;  

string streamType;   

  

// 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;  

  // Allow the user to choose the page range he or she would  

  // like to print.  

  System.Windows.Forms.PrintDialog PrintDialog1=  

new PrintDialog ();//实现C#打印之创建一个PrintDialog的实例。  

  PrintDialog1.AllowSomePages = true;   

  

  // Show the help button.  

  PrintDialog1.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   

  PrintDialog1.Document = docToPrint;  

//把PrintDialog的Document属性设为上面配置好的PrintDocument的实例   

  

  DialogResult result = PrintDialog1.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();//实现C#打印之开始打印  

  }   

  

}   

  

// 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;  

  }  

    

}   

  

}  

}