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    <p>You could use a variation on the Observer pattern to the same effect. Not sure what your threading requirements are, and I suspect this suffers from similar dereferencing problems as <a href="https://stackoverflow.com/questions/289002/how-to-raise-custom-event-from-a-static-class/289358#289358">How to raise custom event from a Static Class</a> (although would have to play with the code a bit more to bottom that out):</p> <p>using System; using System.Collections.Generic;</p> <p>namespace ClassLibrary1 { public class StaticObservable { private static int currentNumber;</p> <pre><code> private static readonly List&lt;IObserver&gt; observers = new List&lt;IObserver&gt;(); public static int CurrentNumber { get{return currentNumber;} set { currentNumber = value; foreach (var observer in observers) { observer.NotifyChange(); } } } public static void Attach(IObserver observer) { observers.Add(observer); } public static void Detach(IObserver observer) { observers.Remove(observer); } } public interface IObserver { void NotifyChange(); } public class ObserverImpl : IObserver { public void NotifyChange() { Console.Out.WriteLine("Number has changed"); } } public class AppWrapper { public static void Main (string[] args) { Console.ReadLine(); var observerImpl1 = new ObserverImpl(); var observerImpl2 = new ObserverImpl(); StaticObservable.Attach(observerImpl1); StaticObservable.Attach(observerImpl2); StaticObservable.CurrentNumber = 1; Console.ReadLine(); } } </code></pre> <p>}</p>
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