我做错了什么?具有DataBinding的自定义用户控件内的依赖项属性

这看起来像是WinRT中的一些同步问题-我使用了一个转换器来检查我得到了什么，看起来int值被设置为null。一旦我修改了代码以异步调用对属性的更新，它就开始正常工作了。

XAML:

<UserControl
    x:Class="DPTest.UserControl1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:DPTest"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300"
    d:DesignWidth="400"
    x:Name="TestControl"
    x:Uid="TestControl">
    <Grid>
        <Grid.Resources>
            <local:IntToStringConverter
                x:Key="IntToStringConverter" />
        </Grid.Resources>
        <TextBlock
            x:Name="lblCount"
            HorizontalAlignment="Left"
            Margin="0,0,0,0"
            TextWrapping="Wrap"
            Text="{Binding Path=TheCount, Converter={StaticResource IntToStringConverter}, ElementName=TestControl, Mode=OneWay}"
            VerticalAlignment="Top"
            FontSize="36" />
        <Button
            x:Name="btnLess"
            Content="&lt;"
            HorizontalAlignment="Left"
            Margin="0,71,0,0"
            VerticalAlignment="Top"
            Width="75"
            Click="btnLess_Click"
            ClickMode="Release" />
        <Button
            x:Name="btnMore"
            Content="&gt;"
            HorizontalAlignment="Left"
            Margin="91,71,0,0"
            VerticalAlignment="Top"
            Width="75"
            Click="btnMore_Click"
            ClickMode="Release" />
    </Grid>
</UserControl>

代码背后：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
namespace DPTest
{
    public sealed partial class UserControl1 : UserControl
    {
        public static readonly DependencyProperty TheCountProperty =
            DependencyProperty.Register(
                "TheCount",
                typeof(int),
                typeof(UserControl1),
                new PropertyMetadata(
                    0,
                    new PropertyChangedCallback(TheCountProperty_Changed)));
        public int TheCount
        {
            get { return (int)GetValue(TheCountProperty); }
            set { SetValue(TheCountProperty, value); }
        }
        private static void TheCountProperty_Changed(DependencyObject source, DependencyPropertyChangedEventArgs e)
        {
        }
        public UserControl1()
        {
            this.InitializeComponent();
        }
        private void btnLess_Click(object sender, RoutedEventArgs e)
        {
            //lblCount.Text = (Convert.ToInt32(lblCount.Text) - 1).ToString();
            this.Dispatcher.InvokeAsync(
                Windows.UI.Core.CoreDispatcherPriority.Low,
                (s, a) => this.TheCount -= 1,
                this,
                null);
        }
        private void btnMore_Click(object sender, RoutedEventArgs e)
        {
            //lblCount.Text = (Convert.ToInt32(lblCount.Text) + 1).ToString();
            this.Dispatcher.InvokeAsync(
                Windows.UI.Core.CoreDispatcherPriority.Low,
                (s, a) => this.TheCount += 1,
                this,
                null);
        }
    }
    public class IntToStringConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, string language)
        {
            return value.ToString();
        }
        public object ConvertBack(object value, Type targetType, object parameter, string language)
        {
            throw new NotImplementedException();
        }
    }
}

我从RichTextBox继承了一些非常相似的东西。

http://www.wpfsharp.com/2011/08/01/loading-a-richtextbox-from-an-rtf-file-using-binding-or-a-richtextfile-control/

我发现我没有将依赖属性设为只读（不确定这是否重要）

此外，我假设您打算填充以下内容：

private static void TheCountProperty_Changed(DependencyObject source, DependencyPropertyChangedEventArgs e)
{
}