在C#中使用PrintDialog可以很方便的实现程序的打印功能。 其步骤如下: 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(); } 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); 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 ();//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();//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; }
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();
}
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); 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 ();//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();//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;
}
} }
}