Printing in WPF TreeGrid (SfTreeGrid)

The printing feature can be achieved by exporting the tree grid to PDF and printing the exported PDF using the PdfViewerControl .

var options = new TreeGridPdfExportingOptions();
FileStream fileStream = new FileStream("Sample.pdf", FileMode.Create);
var document = treeGrid.ExportToPdf(options);
MemoryStream stream = new MemoryStream();
document.Save(stream);
PdfViewerControl pdfViewer = new PdfViewerControl();
pdfViewer.Load(stream);
Window window = new Window();
window.Content = pdfViewer;
window.Loaded += Window_Loaded;
window.Show();

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    var toolbar = pdfViewer.Template.FindName("PART_Toolbar", pdfViewer) as DocumentToolbar;

    // Get an instance of the open and save file buttons using its template name.

    Button openButton = (Button)toolbar.Template.FindName("PART_ButtonOpen", toolbar);
    Button saveButton = (Button)toolbar.Template.FindName("PART_ButtonSave", toolbar);

    // Set visibility of the button to collapsed.
    openButton.Visibility = System.Windows.Visibility.Collapsed;
    saveButton.Visibility = Visibility.Collapsed;
}

Printing support in WPF treegrid

You can download the sample.

You can print only the parent and expanded child nodes by overriding the ExportNodesToPdf method of the TreeGridToPdfConverter class.

var options = new TreeGridPdfExportingOptions();
options.AllowIndentColumn = true;
options.FitAllColumnsInOnePage = true;

var document = treeGrid.ExportToPdf(options, true);

PdfViewerControl pdfViewer = new PdfViewerControl();
MemoryStream stream = new MemoryStream();
document.Save(stream);
PdfLoadedDocument ldoc = new PdfLoadedDocument(stream);
pdfViewer.Load(ldoc);
// If you want to  show the pdf viewer window, enable the following line.
MainWindow pdfPage = new MainWindow();
pdfPage.Content = pdfViewer;
pdfPage.Show();
pdfViewer.Print(true);

public class TreeGridCustomPdfConverter : TreeGridToPdfConverter
{
    internal bool _excludeNonExpandedNodes;
    public TreeGridCustomPdfConverter(bool excludeNonExpandedNodes) :base()
    {
        _excludeNonExpandedNodes = excludeNonExpandedNodes;
    }
    /// <summary>
    /// ExportNodes to PDF
    /// </summary>
    /// <param name="treeGrid"></param>
    /// <param name="nodes"></param>
    /// <param name="pdfGrid"></param>
    /// <param name="pdfExportingOptions"></param>
    protected override void ExportNodesToPdf(SfTreeGrid treeGrid, TreeNodes nodes, PdfGrid pdfGrid, TreeGridPdfExportingOptions pdfExportingOptions)
    {
        if (!_excludeNonExpandedNodes)
        {
            base.ExportNodesToPdf(treeGrid, nodes, pdfGrid, pdfExportingOptions);
        }
        else
        {
            for (int i = 0; i < nodes.Count; i++)
            {
                TreeNode node = nodes[i];
                ExportNodeToPdf(treeGrid, node, pdfGrid, pdfExportingOptions);
                if (node.IsExpanded && node.HasChildNodes)
                {
                    node.PopulateChildNodes();
                    ExportNodesToPdf(treeGrid, node.ChildNodes, pdfGrid, pdfExportingOptions);
                }
            }
        }
    }
}

You can download the sample.

The print page can be customized when exporting by passing the TreeGridPdfExportingOptions instance as an argument to the ExportToPdf and ExportToPdfGrid methods. Refer to this documentation to customize the export options.