The following steps must be accomplished to display an Open File dialog box:

1. Create an NOpenFileDialog instance.
2. Configure its properties like file filter, initial directory and multiple file selection.
3. Subscribe for the Closed event.
4. Call the RequestShow method.

The code below creates and shows an Open File dialog box.

NOpenFileDialog ofd = new NOpenFileDialog();
ofd.SelectedFilter = 1;
ofd.Filter = "Image Files|*.png;*.jpg;*.jpeg;*.bmp;*.gif|All Files|*.*";
ofd.InitialDirectory = @"D:\Images";
ofd.MultiSelect = false;
ofd.Closed += new Function<NOpenFileDialogResult>(ofd_Closed);
ofd.RequestShow();

The Closed event is raised when the user closes the dialog box. The event handler method receives a parameter of type NOpenFileDialogResult, which provides access to the dialog box result and the selected files:

void ofd_Closed(NOpenFileDialogResult arg)
{
    if ((arg.Result == ENCommonDialogResult.OK) || (arg.Files.Length > 0))
    {
        FileInfo fileInfo = arg.Files[0];
        // NOTE: To access the file data you can use fileInfo.FullName or fileInfo.OpenRead()
    }
}

The NOpenFileDialogResult instance contains an array of System.IO.FileInfo objects, each of them representing one of the selected files.

The following steps must be accomplished to display a Save File dialog box:

1. Create an NSaveFileDialog instance.
2. Configure its properties like file filter, default file name and default extension.
3. Subscribe for the Closed event.
4. Call the RequestShow method.

The code below creates and shows a Save File dialog box.

NSaveFileDialog sfd = new NSaveFileDialog();
sfd.DefaultFileName = "Document1";
sfd.DefaultExtension = "rtf";
sfd.Filter = "RTF Files|*.rtf|All Files|*.*";
sfd.SelectedFilter = 1;
sfd.Closed += new Function<NSaveFileDialogResult>(sfd_Closed);
sfd.RequestShow();

The Closed event is raised when the user closes the dialog box. The event handler method receives an instance of type NSaveFileDialogResult, which provides access to the dialog box result and the selected file:

void sfd_Closed(NSaveFileDialogResult arg)
{
    if (arg.Result == ENCommonDialogResult.OK)
    {
        FileInfo fileInfo = arg.File;
        // ...
    }
}

Printing in NOV is initiated by the user through a Print Dialog. Print dialogs are represented by the NPrintDialog type, which contains settings for the printer name, page range, number of copies and collation. The code bellow creates and configures a Print Dialog:

NPrintDialog printDialog = new NPrintDialog();
printDialog.EnableCustomPageRange = true;
printDialog.EnableCurrentPage = true;
printDialog.PrintRangeMode = ENPrintRangeMode.AllPages;
printDialog.CustomPageRange = new NRangeI(1, 100);
printDialog.NumberOfCopies = 1;
printDialog.Collate = false;

Similarly to the other common dialogs, in order to get a notification when the dialog is closed, you have to subscribe for the Closed event.

printDialog.Closed += new Function<NPrintDialogResult>(printDialog_Closed);

The content for printing is provided by a Print Document object. An instance of the NPrintDocument type must be assigned to the print dialog’s PrintDocument property:

NPrintDocument printDocument = new NPrintDocument();
printDocument.DocumentName = "Test Document";
printDialog.PrintDocument = printDocument;

The print document object raises notification events during printing. You can subscribe for several events that are raised at different stages of the printing process:

printDocument.BeginPrint += printDocument_BeginPrint;
printDocument.QueryPageSettings += printDocument_QueryPageSettings;
printDocument.PrintPage += printDocument_PrintPage;
printDocument.EndPrint += printDocument_EndPrint;

Finally to show the dialog you have to call the RequestShow method:

printDialog.RequestShow();

When the user clicks the “Print” button on the dialog, the printing process begins. First the print document’s BeginPrint event is raised, followed by a series of QueryPageSettings and PrintPage events. Both QueryPageSettings and PrintPage are raised once for each page. The handler of the QueryPageSettings event is the place where you can change the page size and orientation for the current page. In the PrintPage event handler you have to render the actual contents of the current page. The following example demonstrates how this can be done:

void printDocument_PrintPage(NPrintDocument sender, NPrintPageEventArgs e)
{
    NPaintVisitor visitor = new NPaintVisitor(e.Graphics, 300, NMatrix.Identity, null);
 
    switch (m_PageIndex)
    {
        case 0:
            visitor.SetFill(NColor.Red);
            break;
 
        case 1:
            visitor.SetFill(NColor.Green);
            break;
 
        case 2:
            visitor.SetFill(NColor.Blue);
            break;
    }
   
    visitor.PaintEllipse(10, 10, 200, 150);
 
    m_PageIndex++;
 
    e.HasMorePages = (m_PageIndex < 3);
}

In order to draw a scene, you need an NPaintVisitor object – one can be created using the NGraphics2D object contained in the NPrintPageEventArgs argument. To signify that there are no more pages to print, you have to set the HasMorePages property of the NPrintPageEventArgs argument to false.

After all pages are printed, or if the printing is cancelled, the EndPrint event is raised.