<Window x:Name="winThis" x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Create a Read-Only Dependency Property" Height="300" Width="300">
<Grid>
<Viewbox>
<TextBlock Text="{Binding ElementName=winThis, Path=Counter}" />
</Viewbox>
</Grid>
</Window>
//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Threading;
namespace WpfApplication1
{
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
DispatcherTimer timer =
new DispatcherTimer(TimeSpan.FromSeconds(1),
DispatcherPriority.Normal,
delegate
{
int newValue = Counter == int.MaxValue ? 0 : Counter + 1;
SetValue(counterKey, newValue);
},
Dispatcher);
}
public int Counter
{
get { return (int)GetValue(counterKey.DependencyProperty); }
}
private static readonly DependencyPropertyKey counterKey =
DependencyProperty.RegisterReadOnly("Counter",
typeof(int),
typeof(Window1),
new PropertyMetadata(0));
}
}
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