The printing function of the. NET Framework in MIS development

Print

The printing capabilities of the Microsoft. NET Framework are provided in a modular way, providing great convenience for programmers, but the use of these components is complex and needs to be explained.

Print operations typically include the following four features

1 print settings Set some of the printer's parameters such as changing the printer driver, etc.

2 page settings Set page size paper type etc

3 Print Preview is similar to print preview in Word

4 Printing

The core of the implementation of the printing function is the PrintDocument class, which belongs to the System.Drawing.Printing namespace, which encapsulates the current print settings page settings and the

Some printing-related events and methods

This class includes several property events and methods

1, PrinterSettings Property

Store setup information for a printer this property does not require programmer setup because it is obtained by the Print dialog box

2, Printcountroller Property

Controlling the printing process

3, DefaultPageSettings Property

Store page settings information paper size direction and so do not need programmer settings because it is obtained by the Page Setup dialog box

4, DocumentName Property

Specify the document name, which appears in the Printer status window

1. BeginPrint Event

Issued before printing

2. The PrintPage incident

Each printed page is issued, and the event accepts a PrintPageEventArgs parameter that encapsulates printing-related information

The PrintPageEventArgs parameter has many important properties

1 Cancel Print

2 drawing objects for Graphics pages

3 HasMorePages If there is a page to print

Print method The method has no arguments to call it will start printing as it is currently set

If you implement the print function first constructs the PrintDocument object to add the printing event

PrintDocument PrintDocument;
private void InitializeComponent ()
{
...
Printdocument=new PrintDocument ();
Printdocument.printpage + = new Printpageeventhandler (this.printdocument_printpage);
...
}
Implementing Print Event Functionality
Printing and drawing are similar to the method of calling the graphics class to paint different is one on the monitor on the printed paper and printing to perform some complex calculations
such as line break page.
private void Printdocument_printpage (Object Sender,printpageeventargs e)
{
Graphics g = e.graphics; Get drawing objects
float linesperpage = 0; The line number of the page
float yposition = 0; Draw the portrait position of a string
int count = 0; Line counter
float leftMargin = e.marginbounds.left; Left margin
float topMargin = e.marginbounds.top; Top margin
string line = null; Line string
Font Printfont = This.textBox.Font; The current print font
SolidBrush MyBrush = new SolidBrush (color.black);//brushes
linesPerPage = E.marginbounds.height/printfont.getheight (g);//printable number of lines per page
Print one page at a line-by-row cycle
while (Count < linesPerPage && ((Line=linereader.readline ())!= null))
{
YPosition = TopMargin + (count * printfont.getheight (g));
g.DrawString (line, Printfont, MyBrush, LeftMargin, YPosition, New StringFormat ());
count++;
}

If the page is printed and the line is not empty, there are still unfinished pages. This triggers the next print event in the next print Linereader will

Automatically reads content that was not printed last time because Linereader is a member of a class outside of this print method, it can record the current read location

if (line!= null)
E.hasmorepages = true;
Else
E.hasmorepages = false;
}

Print settings, construct a Print dialog box to assign the document property set in the dialog box to PrintDocument this will automatically save the user's settings to the PrintDocument

In the PrinterSettings property of the

protected void Filemenuitem_printset_click (Object Sender,eventargs e)
{
PrintDialog PrintDialog = new PrintDialog ();
Printdialog.document = PrintDocument;
Printdialog.showdialog ();
}

Page Setup and print preview are the same as the print Setup principle of constructing a dialog box to save a user's settings in a dialog box to the properties of the corresponding class

protected void Filemenuitem_pageset_click (Object Sender,eventargs e)
{
PageSetupDialog PageSetupDialog = new PageSetupDialog ();
Pagesetupdialog.document = PrintDocument;
Pagesetupdialog.showdialog ();
}

Print Preview

protected void Filemenuitem_printview_click (Object Sender,eventargs e)
{
PrintPreviewDialog PrintPreviewDialog = new PrintPreviewDialog ();
Printpreviewdialog.document = PrintDocument;
Linereader = new StringReader (textbox.text);
Try
{
Printpreviewdialog.showdialog ();
}
catch (Exception excep)
{
MessageBox.Show (EXCEP. Message, "Print error", MessageBoxButtons.OK, Messageboxicon.error);
}
}

Printing allows you to call the PrintDocument print () method directly because the user may have to change the print settings before printing, so

Display the Print Setup dialog box again here

protected void Filemenuitem_print_click (Object Sender,eventargs e)
{
PrintDialog PrintDialog = new PrintDialog ();
Printdialog.document = PrintDocument;
Linereader = new StringReader (textbox.text);
if (printdialog.showdialog () = = DialogResult.OK)
{
Try
{
Printdocument.print ();
}
catch (Exception excep)
{
MessageBox.Show (EXCEP. Message, "Print error", MessageBoxButtons.OK, Messageboxicon.error);
PrintDocument.PrintController.OnEndPrint (Printdocument,new PrintEventArgs ());
}
}
}

The process of summarizing the printing is

1 PrintPage method for constructing PrintDocument objects to add PrintDocument when the application form is initialized

2 Implement PrintPage Method 4 to implement printing by calling the PrintDocument Print method in a user's Click event

In the middle of this you may want to use the PrintDialog PrintPreviewDialog PageSetupDialog settings and view the printing effect

These methods are usually triggered by the click of a menu.