WPF打印画布与儿童而不是窗口

Question

我想编写一个WPF程序，其中我想打印程序/窗口的特定部分。我只想要打印画布。 不幸的是整个窗口一直打印，但我只想要打印画布。

以下是布局示例：

这是我的代码：

public partial class MainWindow : Window
{
    string name;

    public MainWindow()
    {
        InitializeComponent();
    }

    private void Text(double x, double y, string text)
    {
        canvasPrintExample.Children.Clear();
        TextBlock textBlock = new TextBlock();
        textBlock.Text = text;
        textBlock.Foreground = new SolidColorBrush(Colors.Black);
        Canvas.SetLeft(textBlock, x);
        Canvas.SetTop(textBlock, y);
        canvasPrintExample.Children.Add(textBlock);
    }

    private void tbxClientInfoName_TextChanged(object sender, TextChangedEventArgs e)
    {
        clientInfoName = tbxClientInfoName.Text;

        Text(0, 0, name);
    }

    private void btnPrintCanvas_Click(object sender, RoutedEventArgs e)
    {
        PrintDialog prnt = new PrintDialog();
        if (prnt.ShowDialog() == true)
        {
            Size pageSize = new Size(prnt.PrintableAreaWidth, prnt.PrintableAreaHeight);
            canvasPrintExample.Measure(pageSize);
            canvasPrintExample.Arrange(new Rect(0, 0, pageSize.Width, pageSize.Height));

            prnt.PrintVisual(canvasPrintExample, "Print");
        }
        this.Close();
    }
}

我尝试在'btnPrintCanvas_Click'

中更改此行

Size pageSize = new Size(canvasPrintExample.Width, canvasPrintExample.Height);

我尝试过硬编码：     尺寸pageSize =新尺寸（200,400）;

但没有任何改变。我得到的就是这个.pdf打印：

编辑 - 添加.xaml

<Window x:Class="Test.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:Factv001"
    mc:Ignorable="d"
    Title="MainWindow" Height="810" Width="1010" Background="LightGray">
<Grid>
    <Canvas Name="canvasPrintExample" HorizontalAlignment="Left" Height="750" Margin="452,10,0,0" VerticalAlignment="Top" Width="530.3" Background="White"/>
    <TextBox Name="tbxClientInfoName" HorizontalAlignment="Left" Height="23" Margin="10,31,0,0" TextWrapping="Wrap" Text="Name" VerticalAlignment="Top" Width="225" TextChanged="tbxClientInfoName_TextChanged"/>
    <Button x:Name="btnPrintCanvas" Content="Print" HorizontalAlignment="Left" Margin="167,682,0,0" VerticalAlignment="Top" Width="75" Click="btnPrintCanvas_Click"/>
</Grid>