WPF Clipboard copy and paste shape via serialize shape to text

//<Window x:Class="WpfApp64.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:WpfApp64"
        WindowState="Maximized"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Canvas x:Name="cvs" PreviewMouseDown="cvs_PreviewMouseDown"/>
    </Grid>
</Window>



//cs
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp64
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private Ellipse elp { get; set; }
        public MainWindow()
        {
            InitializeComponent();
            InitData();
        }

        private void InitData()
        {
            elp = new Ellipse();
            elp.Width = 100;
            elp.Height = 100;
            elp.Fill = new SolidColorBrush(Colors.Red);
            elp.Stroke = new SolidColorBrush(Colors.Black);
            elp.StrokeThickness = 5;
            Canvas.SetLeft(elp, 200);
            Canvas.SetTop(elp, 200);
            if (!cvs.Children.Contains(elp))
            {
                cvs.Children.Add(elp);
            }
        }

        private void cvs_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            //copy
            if (Keyboard.Modifiers == ModifierKeys.Control && Keyboard.IsKeyDown(Key.C))
            {
                try
                {
                    JsonSerializerSettings settings = new JsonSerializerSettings();
                    settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
                    string jsonStr = JsonConvert.SerializeObject(elp, Newtonsoft.Json.Formatting.Indented,
                      settings);
                    Clipboard.SetText(jsonStr);
                    MessageBox.Show("Copy successfully!");
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }

            }
            else if (Keyboard.Modifiers == ModifierKeys.Control && Keyboard.IsKeyDown(Key.V))
            {
                try
                {
                    string pastedStr = Clipboard.GetText();
                    System.IO.File.WriteAllText("paste.txt", pastedStr);
                    MessageBox.Show("Pasted successfully!");
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }
        }
    }
}