DependencyProperty.RegisterReadOnly to create read only Dependency Property : DependencyProperty « Windows Presentation Foundation « C# / CSharp Tutorial

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C# / CSharp Tutorial » Windows Presentation Foundation » DependencyProperty 
24.150.1.DependencyProperty.RegisterReadOnly to create read only Dependency Property
<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 ? : 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));
    }
}
WPF Dependency Property Register Read Only To Create Read Only Dependency Property
24.150.DependencyProperty
24.150.1.DependencyProperty.RegisterReadOnly to create read only Dependency PropertyDependencyProperty.RegisterReadOnly to create read only Dependency Property
24.150.2.Clear locally set values and restore the default values of dependency propertiesClear locally set values and restore the default values of dependency properties
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