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How to analyze C#printing and C#print preview implementation, many novices are not very clear about this, in order to help you solve this problem, the following small series will explain in detail for everyone, there are people who need this to learn, I hope you can harvest.

We talked about C#printing and C#print preview implementation, which mainly includes: page settings, print preview, print three parts. The principle of printing is to generate mdi files, and the system will automatically process them in a printed manner when it encounters mdi. So, no matter what template, what method; in PrintPage event processing, can generate a picture to print content OK! The main support classes are included in the namespace System.Drawing.Printing and implemented in the assembly System.Drawing.dll. C#print and C#print preview are implemented mainly through PrintDocument class, and several auxiliary classes are also included: PrintDialog(print dialog box), PrintPreviewDialog(print preview dialog box), PageSetupDialog.

PrintDocument class is the central class for printing and print preview, and the actual printing operation is done through this class. How to print using this class:

PrintDocument printDt = new PrintDocument();

2) Set properties of class instance

3) Add event handling functions for print events of this class

4) Call the Print function of this class to print.

printDt.Print();

There are three properties related to the implementation of C#printing and C#print preview:

◆DefaultPageSettings: saves the default page settings of the printed document, such as size and print orientation, which is a PageSettings type variable.

DocumentName: Used to set the name of the PrintDocument class instance. is a variable of type string.

◆PrinterSettings: Contains printer settings information, which can be set through the "Print" general dialog box.

These 3 properties should be set correctly before printing. PageSettings class and PrinterSettings class Classes related to property settings for the PrintDocument class.

The PageSettings class specifies settings for a single print page.

The PrinterSettings class contains printer settings information. With these two classes, users have full control over printers and print pages.

C#Print and C#Print Preview Implementation Handling Print Events The PrintDocument class provides four events to handle print operations.

◆BeginPrint event

This event is triggered after calling the Print method and before printing the first page. You can set printer properties and page properties that apply to all pages in this event, as well as parameters such as the font used.

The event proxy is PrintEventHandler and the event parameter type is PrintEvnetArgs. PrintEvnetArgs contains a Cancel property that can be set to True to disable printing operations.

This.printDt.BeginPrint += new PrintEventHandler(this.BeginPrinting); Private void BeginPrinting(object sender, PrintEvnetArgs e) {//Handle print start event accordingly }

◆EndPrint event

This event is triggered when *** a page has been printed. Some resource cleanup can be done in this event. The event proxy is PrintEventHandler and the event parameter type is PrintEvnetArgs.

PrintPage events

This event is triggered at the start of printing each page that was printed during this event. The user must provide a handler for this event to complete the actual printing operation.

The event proxy type is PrintPageEvnetHandler and the event parameter type is PrintPageEventArgs.

printDt.PrintPage += new PrintPageEvnetHandler(this.PrintEveryPage); private void PrintEveryPage(object sender, PrintPageEventArgs) { Graphics gh = e.Graphics;//Get drawing object //perform specific painting operations //such as gh.DrawingString(..); .. If (there are still pages unprinted) e.HasMorePages = true; else e.HasMorePages = false; }

◆ PageQuerySettings events

This event is triggered before each PrintPage event and can be used to set page settings for printing each page.

The event proxy type is QueryPageSettingsEventHandler and the event parameter type is QueryPageSettingsEventArgs. The event parameter contains a PageSettings property.

printDt.QueryPageSettings += new QueryPageSettingsEventHandler(this.SetEveryPage); private void SetEveryPage(object sneder, QueryPageSettingsEventArgs e) { //Set e.PageSettings properties according to different pages...} PrintDialog Dialog To get printer settings information, the. Net framework provides the PrintDialog class for users. PrintDialog printDlg = new PrintDialog();

Before you can display the Print dialog box, you need to set its properties.

One of the most important attributes is the Document attribute, of type PrintDocument., Any settings you make in the dialog box will be saved in this property.

The PrinterSettings property is also used to save settings that users make in dialog boxes.

One of the Document and PrinterSettings properties must be set before the Print dialog box can be displayed.

Print to File button appears in dialog box AllowPrintToFile property

Displays the AllowSelection property of the control that selects the page range

Show Help button ShowHelp property

//PrintPreviewDialog ppd = new PrintPreviewDialog(); PrintDocument pd = new PrintDocument(); //Set margins Margins margin = new Margins(20, 20, 20, 20); pd.DefaultPageSettings.Margins = margin; ////PaperSize pageSize = new PaperSize("First custom size", 800, 600); //pd.DefaultPageSettings.PaperSize = pageSize; //Print event settings pd.PrintPage += new PrintPageEventHandler(this.pd_PrintPage);

C#print and C#print preview to achieve the basic content to introduce you here, I hope you understand and learn C#print and C#print preview to achieve programming is helpful.

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