WPF如何动态创建文本框并在按钮单击时找到文本框？

<Grid>
    <Grid.ColumnDefinitions>
       <ColumnDefinition Width="*"/>
       <ColumnDefinition Width="Auto"/>
    </Grid.ColumnDefinitions>
   <StackPanel x:Name="stackPanel" Grid.Column="0" Orientation="Vertical"/>
   <Button x:Name="button" Grid.Column="1" Content="Add TextBox" Click="Button_Click"/>
</Grid>

private void Button_Click(object sender, RoutedEventArgs e)
{
    TextBox textBox = new TextBox();
    textBox.Name = "textBox" + (stackPanel.Children.Count + 1);
    textBox.Width = 200;
    textBox.Margin = new Thickness(0, 5, 0, 5);
    stackPanel.Children.Add(textBox);
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    TextBox textBox = stackPanel.Children.OfType<TextBox>().LastOrDefault();
    if (textBox != null)
    {
        // 在这里处理文本框
    }
}