What is the result of the following code? Assume that objOutput_PrintPage is defined.
private void btnPrint_Click(
object sender, System.EventArgs e )
{
PrintDocument objOutput = new PrintDocument();
// add PrintPage event handler
objOutput.PrintPage += new PrintPageEventHandler(
objOutput_PrintPage );
objOutput.Print();
} // end method btnPrint_Click
The code indicates that the PrintPage event for objOutput should invoke the
objOutput_PrintPage event handler. The complete code reads:
// PrintDocument.cs
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Printing;
namespace PrntDocument
{
///
/// Summary description for FrmPrintDocument.
///
public class FrmPrintDocument : System.Windows.Forms.Form
{
private System.Windows.Forms.Label lblinput;
private System.Windows.Forms.TextBox txtInput;
private System.Windows.Forms.Button btnPrint;
///
/// Required designer variable.
///
private System.ComponentModel.Container components = null;
public FrmPrintDocument()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent
// call
//
}
///
/// Clean up any resources being used.
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
// Windows Form Designer generated code
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.Run( new FrmPrintDocument() );
}
// defines an event handler for the PrintPage event
private void btnPrint_Click(
object sender, System.EventArgs e )
{
PrintDocument objOutput = new PrintDocument();
// add PrintPage event handler
objOutput.PrintPage += new PrintPageEventHandler(
objOutput_PrintPage );
objOutput.Print();
} // end method btnPrint_Click
// prints an empty page
private void objOutput_PrintPage( object sender,
System.Drawing.Printing.PrintPageEventArgs e )
{
// if no printers installed, display error message
if ( PrinterSettings.InstalledPrinters.Count == 0 )
{
MessageBox.Show( "Printer Unavailable", "Error",
MessageBoxButtons.RetryCancel,
MessageBoxIcon.Error );
return; // exit event handler
}
} // end method objOutput_PrintPage
} // end class FrmPrintDocument
}
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