调用 InitializeComponent 时发生 StackOverflow 错误

我制作了一个箭头控制器来递减 TextBox 中的数值：

<Label Content="{Binding ElementName=qqq, Path=Text}" />
<ctrls:UpDownCtrl x:Name="qqq" />

启动应用程序时，出现 StackOverflow 错误：

构造函数中断：

UpDownCtrl.xaml:

<UserControl x:Class="prod_bw.Ctrls.UpDownCtrl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:prod_bw.Ctrls"
             mc:Ignorable="d" d:DesignWidth="800" Height="22">
    <UserControl.DataContext>
        <local:UpDownCtrl />
    </UserControl.DataContext>
    <StackPanel Orientation="Horizontal" Height="22">
        <TextBox x:Name="value" Text="{Binding Text}" Width="32" PreviewTextInput="value_PreviewTextInput" DataObject.Pasting="value_Pasting" MaxLength="3" />
        <StackPanel>
            <Button Height="11" Width="13">
                <TextBlock FontFamily="Marlett" FontSize="11" Text="5" HorizontalAlignment="Center" VerticalAlignment="Center" Cursor="Hand" />
            </Button>
            <Button Height="11" Width="13">
                <TextBlock FontFamily="Marlett" FontSize="11" Text="6" HorizontalAlignment="Center" VerticalAlignment="Center" Cursor="Hand" />
            </Button>
        </StackPanel>
    </StackPanel>
</UserControl>

UpDownCtrl.xaml.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
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;
using static System.Net.Mime.MediaTypeNames;

namespace prod_bw.Ctrls
{
    /// <summary>
    /// Логика взаимодействия для UpDownCtrl.xaml
    /// </summary>
    public partial class UpDownCtrl : UserControl
    {
        private static readonly Regex onlyNumberRegex = new Regex("[^0-9]");

        public string Text { get; set; }

        public UpDownCtrl()
        {
            InitializeComponent();
        }

        private void value_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            e.Handled = onlyNumberRegex.IsMatch(e.Text);
        }

        private void value_Pasting(object sender, DataObjectPastingEventArgs e)
        {
            if (e.DataObject.GetDataPresent(typeof(string)))
            {
                string text = (string)e.DataObject.GetData(typeof(string));
                if (onlyNumberRegex.IsMatch(text))
                {
                    e.CancelCommand();
                }
            }
            else
            {
                e.CancelCommand();
            }
        }
    }
}