Code

public void PrintPreview(string windowTitle)
{
	MemoryStream ms = new MemoryStream();
	Package pkg = Package.Open(ms, FileMode.Create, FileAccess.ReadWrite);
	string pack = "pack://temp.xps";
	var uri = new Uri(pack);
	PackageStore.AddPackage(uri, pkg);
	XpsDocument doc = new XpsDocument(pkg, CompressionOption.NotCompressed, pack);
	XpsSerializationManager rsm = new XpsSerializationManager(new XpsPackagingPolicy(doc), false);
	rsm.SaveAsXaml(DocumentPaginator);
	var w = new Window();
	DocumentViewer dv = new DocumentViewer();
	dv.Document = doc.GetFixedDocumentSequence();
	w.Content = dv;
	w.Title = windowTitle;
	w.ShowDialog();
	PackageStore.RemovePackage(uri);
}
 

Code

private void OnFileCustomPrintPreview(object sender, RoutedEventArgs e)
{
	MemoryStream ms = new MemoryStream();
	Package pkg = Package.Open(ms, FileMode.Create, FileAccess.ReadWrite);
	string pack = "pack://temp.xps";
	var uri = new Uri(pack);
	PackageStore.AddPackage(uri, pkg);
	XpsDocument doc = new XpsDocument(pkg, CompressionOption.NotCompressed, pack);
	XpsSerializationManager rsm = new XpsSerializationManager(new XpsPackagingPolicy(doc), false);

	DocumentPaginator paginator = diagram.DocumentPaginator;
	paginator.PageSize = new Size(96 * 11, 96 * 8.5);
	rsm.SaveAsXaml(paginator);

	var w = new Window();
	DocumentViewer dv = new DocumentViewer();
	dv.Document = doc.GetFixedDocumentSequence();
	w.Content = dv;
	w.Title = "preview";
	w.Show();
	//PackageStore.RemovePackage(uri);
}
 

Code

public class RightToLeftPaginator : DocumentPaginator
{
	public RightToLeftPaginator(DocumentPaginator paginator)
	{
		this.paginator = paginator;
	}

	private DocumentPaginator paginator;

	public override DocumentPage GetPage(int pageNumber)
	{
		DocumentPage dp = paginator.GetPage(pageNumber);
		DrawingVisual dv = dp.Visual as DrawingVisual;
		dv.Transform = new ScaleTransform(-1, 1)
		{
			CenterX = paginator.PageSize.Width / 2,
			CenterY = paginator.PageSize.Height / 2
		};

		return dp;
	}

	public override bool IsPageCountValid
	{
		get { return paginator.IsPageCountValid; }
	}

	public override int PageCount
	{
		get { return paginator.PageCount; }
	}

	public override Size PageSize
	{
		get
		{
			return paginator.PageSize;
		}
		set
		{
			paginator.PageSize = value;
		}
	}

	public override IDocumentPaginatorSource Source
	{
		get { return paginator.Source; }
	}
}