这里肯定缺少这个方法：

DependencyPropertyDescriptor
    .FromProperty(RadioButton.IsCheckedProperty, typeof(RadioButton))
    .AddValueChanged(radioButton, (s,e) => { /* ... */ });

注意：因为DependencyPropertyDescriptor有一个应用程序中所有处理程序的静态列表，如果处理程序最终没有被删除，那么这些处理程序中引用的每个对象都将泄漏。（它的工作方式与示例对象上的常见事件不同。）
总是使用descriptor.RemoveValueChanged(...)再次删除处理程序。

如果它是一个单独类的DependencyProperty，最简单的方法是将一个值绑定到它，并侦听该值的更改。
如果DP是您在自己的类中实现的，那么您可以在创建DependencyProperty时使用register a PropertyChangedCallback。您可以使用它来监听属性的更改。
如果你正在使用一个子类，你可以使用OverrideMetadata将你自己的PropertyChangedCallback添加到将要被调用的DP中，而不是任何原始的DP。

我写了这个工具类：

• 它为DependencyPropertyChangedEventArgs提供旧值和新值。
• 源存储在绑定中的弱引用中。
• 不确定暴露Binding和BindingExpression是否是个好主意。
• 没有泄漏。

using System;
using System.Collections.Concurrent;
using System.Windows;
using System.Windows.Data;

public sealed class DependencyPropertyListener : DependencyObject, IDisposable
{
    private static readonly ConcurrentDictionary<DependencyProperty, PropertyPath> Cache = new ConcurrentDictionary<DependencyProperty, PropertyPath>();

    private static readonly DependencyProperty ProxyProperty = DependencyProperty.Register(
        "Proxy",
        typeof(object),
        typeof(DependencyPropertyListener),
        new PropertyMetadata(null, OnSourceChanged));

    private readonly Action<DependencyPropertyChangedEventArgs> onChanged;
    private bool disposed;

    public DependencyPropertyListener(
        DependencyObject source, 
        DependencyProperty property, 
        Action<DependencyPropertyChangedEventArgs> onChanged = null)
        : this(source, Cache.GetOrAdd(property, x => new PropertyPath(x)), onChanged)
    {
    }

    public DependencyPropertyListener(
        DependencyObject source, 
        PropertyPath property,
        Action<DependencyPropertyChangedEventArgs> onChanged)
    {
        this.Binding = new Binding
        {
            Source = source,
            Path = property,
            Mode = BindingMode.OneWay,
        };
        this.BindingExpression = (BindingExpression)BindingOperations.SetBinding(this, ProxyProperty, this.Binding);
        this.onChanged = onChanged;
    }

    public event EventHandler<DependencyPropertyChangedEventArgs> Changed;

    public BindingExpression BindingExpression { get; }

    public Binding Binding { get; }

    public DependencyObject Source => (DependencyObject)this.Binding.Source;

    public void Dispose()
    {
        if (this.disposed)
        {
            return;
        }

        this.disposed = true;
        BindingOperations.ClearBinding(this, ProxyProperty);
    }

    private static void OnSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var listener = (DependencyPropertyListener)d;
        if (listener.disposed)
        {
            return;
        }

        listener.onChanged?.Invoke(e);
        listener.OnChanged(e);
    }

    private void OnChanged(DependencyPropertyChangedEventArgs e)
    {
        this.Changed?.Invoke(this, e);
    }
}

using System;
using System.Windows;

public static class Observe
{
    public static IDisposable PropertyChanged(
        this DependencyObject source,
        DependencyProperty property,
        Action<DependencyPropertyChangedEventArgs> onChanged = null)
    {
        return new DependencyPropertyListener(source, property, onChanged);
    }
}

您可以继承您尝试监听的Control，然后直接访问：

protected void OnPropertyChanged(string name)

没有内存泄漏的风险。
不要害怕标准的OO技术。

有多种方法可以实现这一点。下面是一种将依赖属性转换为可观察对象的方法，这样就可以使用System.Reactive订阅它：

public static class DependencyObjectExtensions
{
    public static IObservable<EventArgs> Observe<T>(this T component, DependencyProperty dependencyProperty)
        where T:DependencyObject
    {
        return Observable.Create<EventArgs>(observer =>
        {
            EventHandler update = (sender, args) => observer.OnNext(args);
            var property = DependencyPropertyDescriptor.FromProperty(dependencyProperty, typeof(T));
            property.AddValueChanged(component, update);
            return Disposable.Create(() => property.RemoveValueChanged(component, update));
        });
    }
}

用法

请记住释放订阅以防止内存泄漏：

public partial sealed class MyControl : UserControl, IDisposable 
{
    public MyControl()
    {
        InitializeComponent();

        // this is the interesting part 
        var subscription = this.Observe(MyProperty)
                               .Subscribe(args => { /* ... */}));

        // the rest of the class is infrastructure for proper disposing
        Subscriptions.Add(subscription);
        Dispatcher.ShutdownStarted += DispatcherOnShutdownStarted; 
    }

    private IList<IDisposable> Subscriptions { get; } = new List<IDisposable>();

    private void DispatcherOnShutdownStarted(object sender, EventArgs eventArgs)
    {
        Dispose();
    }

    Dispose(){
        Dispose(true);
    }

    ~MyClass(){
        Dispose(false);
    }

    bool _isDisposed;
    void Dispose(bool isDisposing)
    {
        if(_disposed) return;

        foreach(var subscription in Subscriptions)
        {
            subscription?.Dispose();
        }

        _isDisposed = true;
        if(isDisposing) GC.SupressFinalize(this);
    }
}

如果是这样的话，一个黑客。你可以用DependencyProperty引入一个Static类。你的源类也绑定到那个DP，你的目标类也绑定到DP。