C# WPF DockPanelの印刷

public static void Print(DockPanel dockPanel)
{
    LocalPrintServer localPrintServer = new();
    PrintQueue printQueue = localPrintServer.DefaultPrintQueue;

    // PDF
    // printQueue = new(localPrintServer, "Microsoft Print to PDF");

    XpsDocumentWriter writer = PrintQueue.CreateXpsDocumentWriter(printQueue);

    PrintTicket printTicket = printQueue.DefaultPrintTicket;
    printTicket.PageMediaSize = new PageMediaSize(PageMediaSizeName.ISOA4);
    // 縦
    //printTicket.PageOrientation = PageOrientation.Portrait;
    // 横
    printTicket.PageOrientation = PageOrientation.Landscape;

    // 印刷データ
    var canvas = new Canvas();
    Canvas.SetTop(dockPanel, 50);
    Canvas.SetLeft(dockPanel, 50);

    canvas.Children.Add(dockPanel);

    FixedPage? fixedPage = new();
    fixedPage.Children.Add(canvas);

    writer.Write(fixedPage, printTicket);

    canvas.Children.Remove(dockPanel);
}
 

gridMain.Children.Remove(dockPanelPrint);

Print(dockPanelPrint);

gridMain.Children.Add(dockPanelPrint);