//// MainWindow.xaml.cs

using System.Windows;
using System.Windows.Controls;

namespace WpfApplication1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            var pd = new PrintDialog();
            pd.PrintVisual(myVisual, "Test print");
        }
    }
}

//// MainWindow.xaml

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication1"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel>
        <Button Click="Button_Click" Height="20">click to print</Button>
        <local:MyVisual x:Name="myVisual" Width="100" Height="100"/>
    </StackPanel>
</Window>

//// MyVisual.cs
using System.Globalization;
using System.Windows;
using System.Windows.Media;

namespace WpfApplication1
{
    public class MyVisual : FrameworkElement
    {
        private static Typeface _tf = new Typeface("Carlito");
        private VisualCollection _visuals;

        public MyVisual()
        {
            _visuals = new VisualCollection(this);
            Loaded += MyVisual_Loaded;
        }

        protected override Visual GetVisualChild(int index) => _visuals[index];
        protected override int VisualChildrenCount => _visuals.Count;

        private void MyVisual_Loaded(object sender, RoutedEventArgs e)
        {
            var visual = new DrawingVisual();
            using (DrawingContext dc = visual.RenderOpen())
            {
                var someText = new FormattedText("Delightful", CultureInfo.CurrentCulture, FlowDirection.LeftToRight, _tf, 52, Brushes.Black);
                dc.DrawText(someText, new Point(0, 0));
            }
            _visuals.Add(visual);
        }
    }
}