WPF 打印不显示的元素

<Window x:Class="_097打印不显示的元素.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="184" Width="269">
<Grid Margin="5">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal">
<Label>Scale Percentage:</Label>
<TextBox MinWidth="50" Name="txtScale">500</TextBox>
</StackPanel>
<Button Grid.Row="1" Name="btnPrint" Click="btnPrint_Click_1">Print</Button>
</Grid>

</Window>

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 _097打印不显示的元素
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}

private void btnPrint_Click_1(object sender, RoutedEventArgs e)
{
PrintDialog dialog = new PrintDialog();
if (dialog.ShowDialog() == true)
{
Run run = new Run("This is a test of printing function");
TextBlock visual = new TextBlock();
visual.Inlines.Add(run);
visual.Margin = new Thickness(15);
visual.TextWrapping = TextWrapping.Wrap;
double zoom;
if (double.TryParse(txtScale.Text, out zoom))
{
visual.LayoutTransform = new ScaleTransform(zoom / 100, zoom / 100);
Size pageSize = new Size(dialog.PrintableAreaWidth, dialog.PrintableAreaHeight);
visual.Measure(pageSize);
visual.Arrange(new Rect(0, 0, pageSize.Width, pageSize.Height));
dialog.PrintVisual(visual, "A Scaled Drawing");
}
else
{
MessageBox.Show("Invalid Scale Value");
}
}
}
}
}

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WPF 打印不显示的元素

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